Symfony Profiler

Security

Token

There is no security token.

Firewall

main Name

Security enabled

Stateless

Configuration

Key	Value
provider	security.user.provider.concrete.app_user_provider
context	main
entry_point	App\Security\KbinAuthenticator
user_checker	App\Security\UserChecker
access_denied_handler	(none)
access_denied_url	(none)
authenticators	[`"two_factor" "remember_me" "App\Security\KbinAuthenticator" "App\Security\FacebookAuthenticator" "App\Security\GoogleAuthenticator" "App\Security\GithubAuthenticator" "App\Security\KeycloakAuthenticator"`]

Listeners

Listener	Duration	Response
Symfony\Component\Security\Http\Firewall\ChannelListener {#723`-map: Symfony\Component\Security\Http\AccessMap {#722 …} -logger: Monolog\Logger {#783 …} -httpPort: 80 -httpsPort: 443`}	0.00 ms	(none)
Symfony\Component\Security\Http\Firewall\ContextListener {#706-tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorage {#1017 …} -sessionKey: "_security_main" -logger: Monolog\Logger {#783 …} -userProviders: Symfony\Component\DependencyInjection\Argument\RewindableGenerator {#705 …} -dispatcher: Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher {#747 …} -registered: false -trustResolver: Scheb\TwoFactorBundle\Security\Authentication\AuthenticationTrustResolver {#780 …} -sessionTrackerEnabler: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage::enableUsageTracking(): void {#703 …}}	6.39 ms	(none)
Symfony\Component\Security\Http\Firewall\AuthenticatorManagerListener {#584`-authenticatorManager: Symfony\Component\Security\Http\Authentication\AuthenticatorManager {#595 …}`}	0.00 ms	(none)
Scheb\TwoFactorBundle\Security\Http\Firewall\TwoFactorAccessListener {#582`-twoFactorFirewallConfig: Scheb\TwoFactorBundle\Security\TwoFactor\TwoFactorFirewallConfig {#842 …} -tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …} -twoFactorAccessDecider: Scheb\TwoFactorBundle\Security\Authorization\TwoFactorAccessDecider {#581 …}`}	0.08 ms	(none)
Symfony\Component\Security\Http\Firewall\AccessListener {#579`-tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …} -accessDecisionManager: Symfony\Component\Security\Core\Authorization\TraceableAccessDecisionManager {#937 …} -map: Symfony\Component\Security\Http\AccessMap {#722 …}`}	0.00 ms	(none)
Symfony\Component\Security\Http\Firewall\LogoutListener {#786`-tokenStorage: Symfony\Component\Security\Core\Authentication\Token\Storage\UsageTrackingTokenStorage {#1018 …} -options: [ "csrf_parameter" => "_csrf_token" "csrf_token_id" => "logout" "logout_path" => "app_logout" ] -httpUtils: Symfony\Component\Security\Http\HttpUtils {#841 …} -csrfTokenManager: Symfony\Component\Security\Csrf\CsrfTokenManager {#1015 …} -eventDispatcher: Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher {#747 …}`}	0.00 ms	(none)

Authenticators

No authenticators have been recorded. Check previous profiles on your authentication endpoint.

Access Decision

affirmative Strategy


"Symfony\Component\Security\Core\Authorization\Voter\AuthenticatedVoter"
"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
"Symfony\Component\Security\Core\Authorization\Voter\RoleHierarchyVoter"
"Symfony\Component\Security\Core\Authorization\Voter\ExpressionVoter"
"App\Security\Voter\EntryCommentVoter"
"App\Security\Voter\EntryVoter"
"App\Security\Voter\MagazineVoter"
"App\Security\Voter\MessageThreadVoter"
"App\Security\Voter\MessageVoter"
"App\Security\Voter\NotificationVoter"
"App\Security\Voter\OAuth2UserConsentVoter"
"App\Security\Voter\PostCommentVoter"
"App\Security\Voter\PostVoter"
"App\Security\Voter\UserVoter"

#	Voter class
1	"Symfony\Component\Security\Core\Authorization\Voter\AuthenticatedVoter"
2	"Scheb\TwoFactorBundle\Security\Authorization\Voter\TwoFactorInProgressVoter"
3	"Symfony\Component\Security\Core\Authorization\Voter\RoleHierarchyVoter"
4	"Symfony\Component\Security\Core\Authorization\Voter\ExpressionVoter"
5	"App\Security\Voter\EntryCommentVoter"
6	"App\Security\Voter\EntryVoter"
7	"App\Security\Voter\MagazineVoter"
8	"App\Security\Voter\MessageThreadVoter"
9	"App\Security\Voter\MessageVoter"
10	"App\Security\Voter\NotificationVoter"
11	"App\Security\Voter\OAuth2UserConsentVoter"
12	"App\Security\Voter\PostCommentVoter"
13	"App\Security\Voter\PostVoter"
14	"App\Security\Voter\UserVoter"

Access decision log


null
"App\Security\Voter\UserVoter"
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      **For questions about component-level electronic circuits, tools and equipment.**\n
      \n
      Rules\n
      -----\n
      \n
      1: Be nice.\n
      \n
      2: Be on-topic (eg: *Electronic*, not *electrical*).\n
      \n
      3: No commercial stuff, buying, selling or valuations.\n
      \n
      4: Be safe.\n
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  +domain: Proxies\__CG__\App\Entity\Domain {#1915 …}
  +slug: "Adjusting-SMPS-output-voltage"
  +title: "Adjusting SMPS output voltage"
  +url: "https://discuss.tchncs.de/pictrs/image/70404223-8125-4c4a-97c8-d10521fb9b0f.jpeg"
  +body: """
    Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
    \n
    What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
    \n
    Thanks.
    """
  +type: "image"
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    date: 2023-11-03 23:03:28.0 +01:00
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}
"App\Security\Voter\UserVoter"
App\Entity\Entry {#2412
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    +name: "askelectronics@discuss.tchncs.de"
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    +description: """
      **For questions about component-level electronic circuits, tools and equipment.**\n
      \n
      Rules\n
      -----\n
      \n
      1: Be nice.\n
      \n
      2: Be on-topic (eg: *Electronic*, not *electrical*).\n
      \n
      3: No commercial stuff, buying, selling or valuations.\n
      \n
      4: Be safe.\n
      \n
      ---
      """
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  +domain: Proxies\__CG__\App\Entity\Domain {#1915 …}
  +slug: "Adjusting-SMPS-output-voltage"
  +title: "Adjusting SMPS output voltage"
  +url: "https://discuss.tchncs.de/pictrs/image/70404223-8125-4c4a-97c8-d10521fb9b0f.jpeg"
  +body: """
    Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
    \n
    What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
    \n
    Thanks.
    """
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    date: 2023-11-13 13:25:24.0 +01:00
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    date: 2023-11-03 23:03:28.0 +01:00
  }
}
"App\Security\Voter\UserVoter"
App\Entity\Entry {#2412
  +user: Proxies\__CG__\App\Entity\User {#1978 …}
  +magazine: App\Entity\Magazine {#264
    +icon: Proxies\__CG__\App\Entity\Image {#245 …}
    +name: "askelectronics@discuss.tchncs.de"
    +title: "askelectronics"
    +description: """
      **For questions about component-level electronic circuits, tools and equipment.**\n
      \n
      Rules\n
      -----\n
      \n
      1: Be nice.\n
      \n
      2: Be on-topic (eg: *Electronic*, not *electrical*).\n
      \n
      3: No commercial stuff, buying, selling or valuations.\n
      \n
      4: Be safe.\n
      \n
      ---
      """
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    +entryCommentCount: 1230
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      date: 2024-10-20 10:40:08.0 +02:00
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  +url: "https://discuss.tchncs.de/pictrs/image/70404223-8125-4c4a-97c8-d10521fb9b0f.jpeg"
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    Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
    \n
    What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
    \n
    Thanks.
    """
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}
"App\Security\Voter\UserVoter"
null
"App\Security\Voter\UserVoter"
App\Entity\EntryComment {#4034
  +user: App\Entity\User {#3983 …}
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    +user: Proxies\__CG__\App\Entity\User {#1978 …}
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        **For questions about component-level electronic circuits, tools and equipment.**\n
        \n
        Rules\n
        -----\n
        \n
        1: Be nice.\n
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        2: Be on-topic (eg: *Electronic*, not *electrical*).\n
        \n
        3: No commercial stuff, buying, selling or valuations.\n
        \n
        4: Be safe.\n
        \n
        ---
        """
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      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
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    Better buy a dedicated powersupply. How expensive something is, is in the eye of the beholder, but it is worth it. Most of the ones on this list can be adjusted 10 or 15% and that should get you there from 24V. And they’re actually meant to do it. [dk.rs-online.com/…/switch-mode-stromforsyninger-s…](https://dk.rs-online.com/web/c/stromforsyninger-og-transformere/stromforsyninger/switch-mode-stromforsyninger-smps/?pn=1&amp;rpp=100&amp;sortBy=P_breakPrice1&amp;sortType=ASC&amp;applied-dimensions=4294965650,4290297838,4291523693,4294965001,4293335399,4293589165,4294472088,4294478231,4294273800)
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
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    Better buy a dedicated powersupply. How expensive something is, is in the eye of the beholder, but it is worth it. Most of the ones on this list can be adjusted 10 or 15% and that should get you there from 24V. And they’re actually meant to do it. [dk.rs-online.com/…/switch-mode-stromforsyninger-s…](https://dk.rs-online.com/web/c/stromforsyninger-og-transformere/stromforsyninger/switch-mode-stromforsyninger-smps/?pn=1&amp;rpp=100&amp;sortBy=P_breakPrice1&amp;sortType=ASC&amp;applied-dimensions=4294965650,4290297838,4291523693,4294965001,4293335399,4293589165,4294472088,4294478231,4294273800)
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
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    Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
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    Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
      \n
      Thanks.
      """
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      Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
      \n
      This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
      """
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    That’s not a mains frequency transformer. Not enough steel. It’s a high-frequency all-switchmode supply.\n
    \n
    However, that’s not to say you can simply adjust the feedback and have it safely deliver near twice the voltage. The secondary side diodes and capacitors probably won’t be up to it, or will have a very limited life.\n
    \n
    The transformer does have a ratio, and the marking makes it clear that this is a specific part for the 12V model. How much leeway there is will depend on topology. Flyback are generally fairly flexible. Other types less so.\n
    \n
    Starting with a 24V model and either adjusting the feedback resistors or adding a few diodes would be near trivial. Many will already have a potentiometer that provides that degree of adjustment. Starting with a 12V model is an uphill battle.
    """
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
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      Thanks.
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      Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
      \n
      This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
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    That’s not a mains frequency transformer. Not enough steel. It’s a high-frequency all-switchmode supply.\n
    \n
    However, that’s not to say you can simply adjust the feedback and have it safely deliver near twice the voltage. The secondary side diodes and capacitors probably won’t be up to it, or will have a very limited life.\n
    \n
    The transformer does have a ratio, and the marking makes it clear that this is a specific part for the 12V model. How much leeway there is will depend on topology. Flyback are generally fairly flexible. Other types less so.\n
    \n
    Starting with a 24V model and either adjusting the feedback resistors or adding a few diodes would be near trivial. Many will already have a potentiometer that provides that degree of adjustment. Starting with a 12V model is an uphill battle.
    """
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
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      Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
      \n
      This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
      """
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    That’s not a mains frequency transformer. Not enough steel. It’s a high-frequency all-switchmode supply.\n
    \n
    However, that’s not to say you can simply adjust the feedback and have it safely deliver near twice the voltage. The secondary side diodes and capacitors probably won’t be up to it, or will have a very limited life.\n
    \n
    The transformer does have a ratio, and the marking makes it clear that this is a specific part for the 12V model. How much leeway there is will depend on topology. Flyback are generally fairly flexible. Other types less so.\n
    \n
    Starting with a 24V model and either adjusting the feedback resistors or adding a few diodes would be near trivial. Many will already have a potentiometer that provides that degree of adjustment. Starting with a 12V model is an uphill battle.
    """
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
      \n
      Thanks.
      """
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        Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
        \n
        This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
        """
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      That’s not a mains frequency transformer. Not enough steel. It’s a high-frequency all-switchmode supply.\n
      \n
      However, that’s not to say you can simply adjust the feedback and have it safely deliver near twice the voltage. The secondary side diodes and capacitors probably won’t be up to it, or will have a very limited life.\n
      \n
      The transformer does have a ratio, and the marking makes it clear that this is a specific part for the 12V model. How much leeway there is will depend on topology. Flyback are generally fairly flexible. Other types less so.\n
      \n
      Starting with a 24V model and either adjusting the feedback resistors or adding a few diodes would be near trivial. Many will already have a potentiometer that provides that degree of adjustment. Starting with a 12V model is an uphill battle.
      """
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  +body: "indeed it looks like a Royer oscillator in there (because there are transistors before AND after the transformer)."
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        -----\n
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
      \n
      Thanks.
      """
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        Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
        \n
        This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
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      That’s not a mains frequency transformer. Not enough steel. It’s a high-frequency all-switchmode supply.\n
      \n
      However, that’s not to say you can simply adjust the feedback and have it safely deliver near twice the voltage. The secondary side diodes and capacitors probably won’t be up to it, or will have a very limited life.\n
      \n
      The transformer does have a ratio, and the marking makes it clear that this is a specific part for the 12V model. How much leeway there is will depend on topology. Flyback are generally fairly flexible. Other types less so.\n
      \n
      Starting with a 24V model and either adjusting the feedback resistors or adding a few diodes would be near trivial. Many will already have a potentiometer that provides that degree of adjustment. Starting with a 12V model is an uphill battle.
      """
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
      \n
      Thanks.
      """
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        Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
        \n
        This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
        """
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      That’s not a mains frequency transformer. Not enough steel. It’s a high-frequency all-switchmode supply.\n
      \n
      However, that’s not to say you can simply adjust the feedback and have it safely deliver near twice the voltage. The secondary side diodes and capacitors probably won’t be up to it, or will have a very limited life.\n
      \n
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      \n
      Starting with a 24V model and either adjusting the feedback resistors or adding a few diodes would be near trivial. Many will already have a potentiometer that provides that degree of adjustment. Starting with a 12V model is an uphill battle.
      """
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
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      """
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          Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
          \n
          This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
          """
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        That’s not a mains frequency transformer. Not enough steel. It’s a high-frequency all-switchmode supply.\n
        \n
        However, that’s not to say you can simply adjust the feedback and have it safely deliver near twice the voltage. The secondary side diodes and capacitors probably won’t be up to it, or will have a very limited life.\n
        \n
        The transformer does have a ratio, and the marking makes it clear that this is a specific part for the 12V model. How much leeway there is will depend on topology. Flyback are generally fairly flexible. Other types less so.\n
        \n
        Starting with a 24V model and either adjusting the feedback resistors or adding a few diodes would be near trivial. Many will already have a potentiometer that provides that degree of adjustment. Starting with a 12V model is an uphill battle.
        """
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    +body: "indeed it looks like a Royer oscillator in there (because there are transistors before AND after the transformer)."
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    TO220 package diodes are pretty common in SMPS applications, so I’m not sure that’s a guarantee.\n
    \n
    EDIT: Not sure what you’re getting at here? Royer doesn’t seem to need anything other than a rectifier on the secondary, and plenty of topologies use two power transistors on the primary.\n
    \n
    The second smaller transformer below the main one does tend to suggest it could be a Royer, at least from my reading. I don’t see the extra switches needed for it to be a PFC stage.\n
    \n
    There’s still a little SO-8 and optocouplers.
    """
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
      \n
      Thanks.
      """
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          Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
          \n
          This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
          """
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        That’s not a mains frequency transformer. Not enough steel. It’s a high-frequency all-switchmode supply.\n
        \n
        However, that’s not to say you can simply adjust the feedback and have it safely deliver near twice the voltage. The secondary side diodes and capacitors probably won’t be up to it, or will have a very limited life.\n
        \n
        The transformer does have a ratio, and the marking makes it clear that this is a specific part for the 12V model. How much leeway there is will depend on topology. Flyback are generally fairly flexible. Other types less so.\n
        \n
        Starting with a 24V model and either adjusting the feedback resistors or adding a few diodes would be near trivial. Many will already have a potentiometer that provides that degree of adjustment. Starting with a 12V model is an uphill battle.
        """
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    +body: "indeed it looks like a Royer oscillator in there (because there are transistors before AND after the transformer)."
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  +body: """
    TO220 package diodes are pretty common in SMPS applications, so I’m not sure that’s a guarantee.\n
    \n
    EDIT: Not sure what you’re getting at here? Royer doesn’t seem to need anything other than a rectifier on the secondary, and plenty of topologies use two power transistors on the primary.\n
    \n
    The second smaller transformer below the main one does tend to suggest it could be a Royer, at least from my reading. I don’t see the extra switches needed for it to be a PFC stage.\n
    \n
    There’s still a little SO-8 and optocouplers.
    """
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
      \n
      Thanks.
      """
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          Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
          \n
          This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
          """
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        That’s not a mains frequency transformer. Not enough steel. It’s a high-frequency all-switchmode supply.\n
        \n
        However, that’s not to say you can simply adjust the feedback and have it safely deliver near twice the voltage. The secondary side diodes and capacitors probably won’t be up to it, or will have a very limited life.\n
        \n
        The transformer does have a ratio, and the marking makes it clear that this is a specific part for the 12V model. How much leeway there is will depend on topology. Flyback are generally fairly flexible. Other types less so.\n
        \n
        Starting with a 24V model and either adjusting the feedback resistors or adding a few diodes would be near trivial. Many will already have a potentiometer that provides that degree of adjustment. Starting with a 12V model is an uphill battle.
        """
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    +body: "indeed it looks like a Royer oscillator in there (because there are transistors before AND after the transformer)."
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  +body: """
    TO220 package diodes are pretty common in SMPS applications, so I’m not sure that’s a guarantee.\n
    \n
    EDIT: Not sure what you’re getting at here? Royer doesn’t seem to need anything other than a rectifier on the secondary, and plenty of topologies use two power transistors on the primary.\n
    \n
    The second smaller transformer below the main one does tend to suggest it could be a Royer, at least from my reading. I don’t see the extra switches needed for it to be a PFC stage.\n
    \n
    There’s still a little SO-8 and optocouplers.
    """
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
      \n
      Thanks.
      """
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            Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
            \n
            This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
            """
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          That’s not a mains frequency transformer. Not enough steel. It’s a high-frequency all-switchmode supply.\n
          \n
          However, that’s not to say you can simply adjust the feedback and have it safely deliver near twice the voltage. The secondary side diodes and capacitors probably won’t be up to it, or will have a very limited life.\n
          \n
          The transformer does have a ratio, and the marking makes it clear that this is a specific part for the 12V model. How much leeway there is will depend on topology. Flyback are generally fairly flexible. Other types less so.\n
          \n
          Starting with a 24V model and either adjusting the feedback resistors or adding a few diodes would be near trivial. Many will already have a potentiometer that provides that degree of adjustment. Starting with a 12V model is an uphill battle.
          """
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      +body: "indeed it looks like a Royer oscillator in there (because there are transistors before AND after the transformer)."
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      TO220 package diodes are pretty common in SMPS applications, so I’m not sure that’s a guarantee.\n
      \n
      EDIT: Not sure what you’re getting at here? Royer doesn’t seem to need anything other than a rectifier on the secondary, and plenty of topologies use two power transistors on the primary.\n
      \n
      The second smaller transformer below the main one does tend to suggest it could be a Royer, at least from my reading. I don’t see the extra switches needed for it to be a PFC stage.\n
      \n
      There’s still a little SO-8 and optocouplers.
      """
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  +body: "skipped reading the silkscreen … it says Q1 on the lowermost package but the other three are diodes. so could also be a forward converter or something similar."
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        Rules\n
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
      \n
      Thanks.
      """
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            Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
            \n
            This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
            """
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        +body: """
          That’s not a mains frequency transformer. Not enough steel. It’s a high-frequency all-switchmode supply.\n
          \n
          However, that’s not to say you can simply adjust the feedback and have it safely deliver near twice the voltage. The secondary side diodes and capacitors probably won’t be up to it, or will have a very limited life.\n
          \n
          The transformer does have a ratio, and the marking makes it clear that this is a specific part for the 12V model. How much leeway there is will depend on topology. Flyback are generally fairly flexible. Other types less so.\n
          \n
          Starting with a 24V model and either adjusting the feedback resistors or adding a few diodes would be near trivial. Many will already have a potentiometer that provides that degree of adjustment. Starting with a 12V model is an uphill battle.
          """
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      +body: "indeed it looks like a Royer oscillator in there (because there are transistors before AND after the transformer)."
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    +body: """
      TO220 package diodes are pretty common in SMPS applications, so I’m not sure that’s a guarantee.\n
      \n
      EDIT: Not sure what you’re getting at here? Royer doesn’t seem to need anything other than a rectifier on the secondary, and plenty of topologies use two power transistors on the primary.\n
      \n
      The second smaller transformer below the main one does tend to suggest it could be a Royer, at least from my reading. I don’t see the extra switches needed for it to be a PFC stage.\n
      \n
      There’s still a little SO-8 and optocouplers.
      """
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  +body: "skipped reading the silkscreen … it says Q1 on the lowermost package but the other three are diodes. so could also be a forward converter or something similar."
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
      \n
      Thanks.
      """
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            Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
            \n
            This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
            """
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          That’s not a mains frequency transformer. Not enough steel. It’s a high-frequency all-switchmode supply.\n
          \n
          However, that’s not to say you can simply adjust the feedback and have it safely deliver near twice the voltage. The secondary side diodes and capacitors probably won’t be up to it, or will have a very limited life.\n
          \n
          The transformer does have a ratio, and the marking makes it clear that this is a specific part for the 12V model. How much leeway there is will depend on topology. Flyback are generally fairly flexible. Other types less so.\n
          \n
          Starting with a 24V model and either adjusting the feedback resistors or adding a few diodes would be near trivial. Many will already have a potentiometer that provides that degree of adjustment. Starting with a 12V model is an uphill battle.
          """
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      +body: "indeed it looks like a Royer oscillator in there (because there are transistors before AND after the transformer)."
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    +body: """
      TO220 package diodes are pretty common in SMPS applications, so I’m not sure that’s a guarantee.\n
      \n
      EDIT: Not sure what you’re getting at here? Royer doesn’t seem to need anything other than a rectifier on the secondary, and plenty of topologies use two power transistors on the primary.\n
      \n
      The second smaller transformer below the main one does tend to suggest it could be a Royer, at least from my reading. I don’t see the extra switches needed for it to be a PFC stage.\n
      \n
      There’s still a little SO-8 and optocouplers.
      """
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  +body: "skipped reading the silkscreen … it says Q1 on the lowermost package but the other three are diodes. so could also be a forward converter or something similar."
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    +body: """
      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
      \n
      Thanks.
      """
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      Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
      \n
      This may be switch-regulated for rectification and line voltage correction but it definitely does not look modifiable.
      """
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
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      Considering there is what appears to be a fixed-stepdown 12 volt AC transformer on the line side of that board, I’d be surprised if you will change anything *higher* via IC’s.\n
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      What would be the best way to approach this? I can’t find any schematics on these boards unfortunately.\n
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      Thanks.
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
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  +body: "It’s probably not a good idea for actual use, but if you’d like to experiment: looks like the 3-pin devices U4 and U5 on the upper right provide feedback through the optocouplers next to the class Y cap north of the transformer. I bet those are LM431 voltage references (or similar). The passives around them provide filtering, but two of the resistors should form a resistor divider for the Ref pin (lower right pin if the single pin is on top). That divider sets the voltage."
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
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    I’ve attached a 10k pot with a 10k and 6.8k resistor in series and successfully modified the voltage down to 22.5.\n
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    The power supply itself is a piece of crap though. It claims to handle 400W but anything over 150W causes the short circuit protection to activate, never mind overheating at 150W very quickly.\n
    \n
    ![](https://discuss.tchncs.de/pictrs/image/46f3459e-36ed-4579-b72c-9f41603da85a.jpeg)
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
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    Replying to myself for informational reason. Modifying voltage was more or less successful. Both optocouplers transmit a reference voltage, so both need to be adjusted simultaneously.\n
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    \n
    I’ve attached a 10k pot with a 10k and 6.8k resistor in series and successfully modified the voltage down to 22.5.\n
    \n
    The power supply itself is a piece of crap though. It claims to handle 400W but anything over 150W causes the short circuit protection to activate, never mind overheating at 150W very quickly.\n
    \n
    ![](https://discuss.tchncs.de/pictrs/image/46f3459e-36ed-4579-b72c-9f41603da85a.jpeg)
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      Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One voltage is feedback from the output where then other should be a reference.\n
      \n
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    \n
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    \n
    I’ve attached a 10k pot with a 10k and 6.8k resistor in series and successfully modified the voltage down to 22.5.\n
    \n
    The power supply itself is a piece of crap though. It claims to handle 400W but anything over 150W causes the short circuit protection to activate, never mind overheating at 150W very quickly.\n
    \n
    ![](https://discuss.tchncs.de/pictrs/image/46f3459e-36ed-4579-b72c-9f41603da85a.jpeg)
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App\Entity\Magazine {#264
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  +name: "askelectronics@discuss.tchncs.de"
  +title: "askelectronics"
  +description: """
    **For questions about component-level electronic circuits, tools and equipment.**\n
    \n
    Rules\n
    -----\n
    \n
    1: Be nice.\n
    \n
    2: Be on-topic (eg: *Electronic*, not *electrical*).\n
    \n
    3: No commercial stuff, buying, selling or valuations.\n
    \n
    4: Be safe.\n
    \n
    ---
    """
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  +entryCommentCount: 1230
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  +lastActive: DateTime @1729413608 {#274
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  }
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  +tags: null
  +moderators: Doctrine\ORM\PersistentCollection {#236 …}
  +ownershipRequests: Doctrine\ORM\PersistentCollection {#232 …}
  +moderatorRequests: Doctrine\ORM\PersistentCollection {#221 …}
  +entries: Doctrine\ORM\PersistentCollection {#179 …}
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  +subscriptions: Doctrine\ORM\PersistentCollection {#199 …}
  +bans: Doctrine\ORM\PersistentCollection {#116 …}
  +reports: Doctrine\ORM\PersistentCollection {#102 …}
  +badges: Doctrine\ORM\PersistentCollection {#80 …}
  +logs: Doctrine\ORM\PersistentCollection {#70 …}
  +awards: Doctrine\ORM\PersistentCollection {#1360 …}
  +categories: Doctrine\ORM\PersistentCollection {#1792 …}
  -id: 11
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  +apPublicUrl: "https://discuss.tchncs.de/c/askelectronics"
  +apFollowersUrl: "https://discuss.tchncs.de/c/askelectronics/followers"
  +apInboxUrl: "https://discuss.tchncs.de/inbox"
  +apDomain: "discuss.tchncs.de"
  +apPreferredUsername: "askelectronics"
  +apDiscoverable: true
  +apManuallyApprovesFollowers: null
  +privateKey: null
  +publicKey: null
  +apFetchedAt: DateTime @1727247714 {#268
    date: 2024-09-25 09:01:54.0 +02:00
  }
  +apDeletedAt: null
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  +visibility: "visible             "
  +createdAt: DateTimeImmutable @1687144409 {#270
    date: 2023-06-19 05:13:29.0 +02:00
  }
}
"App\Security\Voter\UserVoter"

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