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App\Entity\Entry {#2084
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#2021 …}
+slug: "TP4056-useless-protection-circuit"
+title: "TP4056 useless protection circuit?"
+url: "https://discuss.tchncs.de/pictrs/image/e920fedd-a20c-4101-bb07-2a91085f7e1d.jpeg"
+body: """
I got these TP4056 modules from an AliExpress vendor and fail to understand how the protection circuit works or if it’s just typical Ali shovelware. It could be my limited understanding of electronics.\n
\n
The protection circuit appears to be just for show. To the right there’s a DW01S chip that prevents over charging and discharging in combination with the 8205 dual channel MOSFET.\n
\n
It looks like the drain of this MOSFET isn’t connected anywhere. I’ve tried following the traces using a multimeter and no other pin shows continuity with the drain. Source1 is connected to Battery - and Source2 is connected to Terminal -.\n
\n
I suppose the Drain starts participating in the circuit when one mosfet activates.\n
\n
What was the idea behind this? That the 8205 acts as an AND gate by having them both in series?\n
\n
I’m trying to make an 18650 testing circuit that uses these modules to charge and discharge a battery and wanted to use the protection circuit mosfet as a trigger for discharging.
"""
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+lang: "en"
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date: 2024-04-08 11:02:53.0 +02:00
}
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+comments: Doctrine\ORM\PersistentCollection {#2078 …}
+votes: Doctrine\ORM\PersistentCollection {#2097 …}
+reports: Doctrine\ORM\PersistentCollection {#2082 …}
+favourites: Doctrine\ORM\PersistentCollection {#2096 …}
+notifications: Doctrine\ORM\PersistentCollection {#2081 …}
+badges: Doctrine\ORM\PersistentCollection {#2098 …}
+children: []
-id: 27733
-titleTs: "'circuit':4 'protect':3 'tp4056':1 'useless':2"
-bodyTs: "'18650':146 '8205':62,128 'act':129 'activ':119 'ali':25 'aliexpress':8 'anywher':77 'appear':38 'batteri':100,158 'behind':124 'channel':64 'charg':55,154 'chip':51 'circuit':17,37,115,148,165 'combin':59 'connect':76,98,104 'continu':92 'could':28 'discharg':57,156,171 'drain':70,95,110 'dual':63 'dw01s':50 'electron':34 'fail':11 'follow':81 'gate':133 'got':2 'idea':123 'isn':74 'like':68 'limit':31 'look':67 'm':141 'make':144 'modul':5,152 'mosfet':65,73,118,166 'multimet':86 'one':117 'particip':112 'pin':90 'prevent':53 'protect':16,36,164 'right':46 'seri':139 'shovelwar':26 'show':43,91 'source1':96 'source2':102 'start':111 'suppos':108 'termin':106 'test':147 'tp4056':4 'trace':83 'tri':80,142 'trigger':169 'typic':24 'understand':13,32 'use':84,150,162 've':79 'vendor':9 'want':160 'work':18"
+cross: false
+upVotes: 0
+downVotes: 0
+ranking: 1704160441
+visibility: "visible "
+apId: "https://discuss.tchncs.de/post/8621799"
+editedAt: DateTimeImmutable @1712566949 {#2061
date: 2024-04-08 11:02:29.0 +02:00
}
+createdAt: DateTimeImmutable @1704132441 {#2079
date: 2024-01-01 19:07:21.0 +01:00
}
} |
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Show voter details
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edit
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App\Entity\Entry {#2084
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#2021 …}
+slug: "TP4056-useless-protection-circuit"
+title: "TP4056 useless protection circuit?"
+url: "https://discuss.tchncs.de/pictrs/image/e920fedd-a20c-4101-bb07-2a91085f7e1d.jpeg"
+body: """
I got these TP4056 modules from an AliExpress vendor and fail to understand how the protection circuit works or if it’s just typical Ali shovelware. It could be my limited understanding of electronics.\n
\n
The protection circuit appears to be just for show. To the right there’s a DW01S chip that prevents over charging and discharging in combination with the 8205 dual channel MOSFET.\n
\n
It looks like the drain of this MOSFET isn’t connected anywhere. I’ve tried following the traces using a multimeter and no other pin shows continuity with the drain. Source1 is connected to Battery - and Source2 is connected to Terminal -.\n
\n
I suppose the Drain starts participating in the circuit when one mosfet activates.\n
\n
What was the idea behind this? That the 8205 acts as an AND gate by having them both in series?\n
\n
I’m trying to make an 18650 testing circuit that uses these modules to charge and discharge a battery and wanted to use the protection circuit mosfet as a trigger for discharging.
"""
+type: "image"
+lang: "en"
+isOc: false
+hasEmbed: true
+commentCount: 3
+favouriteCount: 6
+score: 0
+isAdult: false
+sticky: false
+lastActive: DateTime @1712566973 {#2075
date: 2024-04-08 11:02:53.0 +02:00
}
+ip: null
+adaAmount: 0
+tags: null
+mentions: null
+comments: Doctrine\ORM\PersistentCollection {#2078 …}
+votes: Doctrine\ORM\PersistentCollection {#2097 …}
+reports: Doctrine\ORM\PersistentCollection {#2082 …}
+favourites: Doctrine\ORM\PersistentCollection {#2096 …}
+notifications: Doctrine\ORM\PersistentCollection {#2081 …}
+badges: Doctrine\ORM\PersistentCollection {#2098 …}
+children: []
-id: 27733
-titleTs: "'circuit':4 'protect':3 'tp4056':1 'useless':2"
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+ranking: 1704160441
+visibility: "visible "
+apId: "https://discuss.tchncs.de/post/8621799"
+editedAt: DateTimeImmutable @1712566949 {#2061
date: 2024-04-08 11:02:29.0 +02:00
}
+createdAt: DateTimeImmutable @1704132441 {#2079
date: 2024-01-01 19:07:21.0 +01:00
}
} |
|
Show voter details
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moderate
|
App\Entity\Entry {#2084
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#2021 …}
+slug: "TP4056-useless-protection-circuit"
+title: "TP4056 useless protection circuit?"
+url: "https://discuss.tchncs.de/pictrs/image/e920fedd-a20c-4101-bb07-2a91085f7e1d.jpeg"
+body: """
I got these TP4056 modules from an AliExpress vendor and fail to understand how the protection circuit works or if it’s just typical Ali shovelware. It could be my limited understanding of electronics.\n
\n
The protection circuit appears to be just for show. To the right there’s a DW01S chip that prevents over charging and discharging in combination with the 8205 dual channel MOSFET.\n
\n
It looks like the drain of this MOSFET isn’t connected anywhere. I’ve tried following the traces using a multimeter and no other pin shows continuity with the drain. Source1 is connected to Battery - and Source2 is connected to Terminal -.\n
\n
I suppose the Drain starts participating in the circuit when one mosfet activates.\n
\n
What was the idea behind this? That the 8205 acts as an AND gate by having them both in series?\n
\n
I’m trying to make an 18650 testing circuit that uses these modules to charge and discharge a battery and wanted to use the protection circuit mosfet as a trigger for discharging.
"""
+type: "image"
+lang: "en"
+isOc: false
+hasEmbed: true
+commentCount: 3
+favouriteCount: 6
+score: 0
+isAdult: false
+sticky: false
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date: 2024-04-08 11:02:53.0 +02:00
}
+ip: null
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+comments: Doctrine\ORM\PersistentCollection {#2078 …}
+votes: Doctrine\ORM\PersistentCollection {#2097 …}
+reports: Doctrine\ORM\PersistentCollection {#2082 …}
+favourites: Doctrine\ORM\PersistentCollection {#2096 …}
+notifications: Doctrine\ORM\PersistentCollection {#2081 …}
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+children: []
-id: 27733
-titleTs: "'circuit':4 'protect':3 'tp4056':1 'useless':2"
-bodyTs: "'18650':146 '8205':62,128 'act':129 'activ':119 'ali':25 'aliexpress':8 'anywher':77 'appear':38 'batteri':100,158 'behind':124 'channel':64 'charg':55,154 'chip':51 'circuit':17,37,115,148,165 'combin':59 'connect':76,98,104 'continu':92 'could':28 'discharg':57,156,171 'drain':70,95,110 'dual':63 'dw01s':50 'electron':34 'fail':11 'follow':81 'gate':133 'got':2 'idea':123 'isn':74 'like':68 'limit':31 'look':67 'm':141 'make':144 'modul':5,152 'mosfet':65,73,118,166 'multimet':86 'one':117 'particip':112 'pin':90 'prevent':53 'protect':16,36,164 'right':46 'seri':139 'shovelwar':26 'show':43,91 'source1':96 'source2':102 'start':111 'suppos':108 'termin':106 'test':147 'tp4056':4 'trace':83 'tri':80,142 'trigger':169 'typic':24 'understand':13,32 'use':84,150,162 've':79 'vendor':9 'want':160 'work':18"
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+upVotes: 0
+downVotes: 0
+ranking: 1704160441
+visibility: "visible "
+apId: "https://discuss.tchncs.de/post/8621799"
+editedAt: DateTimeImmutable @1712566949 {#2061
date: 2024-04-08 11:02:29.0 +02:00
}
+createdAt: DateTimeImmutable @1704132441 {#2079
date: 2024-01-01 19:07:21.0 +01:00
}
} |
|
Show voter details
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5 |
DENIED
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6 |
DENIED
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moderate
|
App\Entity\Entry {#1883
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#1604 …}
+slug: "MOSFET-gate-resistor"
+title: "MOSFET gate resistor"
+url: null
+body: """
Since MOSFETs have a gate capacitance you’d want to limit the inrush of current from the output of a microcontroller to prevent it from getting damaged prematurely. That’s what gate resistors are usually good for.\n
\n
Another thing is that most MOSFETs don’t fully activate with a gate voltage below 10V (n type) so usually a microcontroller pin isn’t good enough for switching large loads.\n
\n
I have a 24V system and have made a voltage divider using two 10k resistors to step down 24V to 12V as gate driving voltage which is pulled down with a weaker MOSFET. The power MOSFET essentially ends up with a 10k gate resistor this way meaning it will take a bit longer to fully saturate.\n
\n
Is too high harmful? In this situation the load is a heater that activates when the room temperature drops below 18C and deactivates when it gets above 22C so fast switching is not an issue.
"""
+type: "article"
+lang: "en"
+isOc: false
+hasEmbed: false
+commentCount: 4
+favouriteCount: 8
+score: 0
+isAdult: false
+sticky: false
+lastActive: DateTime @1708524566 {#1908
date: 2024-02-21 15:09:26.0 +01:00
}
+ip: null
+adaAmount: 0
+tags: null
+mentions: null
+comments: Doctrine\ORM\PersistentCollection {#2391 …}
+votes: Doctrine\ORM\PersistentCollection {#2369 …}
+reports: Doctrine\ORM\PersistentCollection {#2392 …}
+favourites: Doctrine\ORM\PersistentCollection {#2395 …}
+notifications: Doctrine\ORM\PersistentCollection {#1384 …}
+badges: Doctrine\ORM\PersistentCollection {#1383 …}
+children: []
-id: 25281
-titleTs: "'gate':2 'mosfet':1 'resistor':3"
-bodyTs: "'10k':82,110 '10v':53 '12v':89 '18c':145 '22c':152 '24v':72,87 'activ':47,138 'anoth':38 'bit':120 'capacit':6 'current':15 'd':8 'damag':27 'deactiv':147 'divid':79 'drive':92 'drop':143 'end':106 'enough':64 'essenti':105 'fast':154 'fulli':46,123 'gate':5,32,50,91,111 'get':26,150 'good':36,63 'harm':128 'heater':136 'high':127 'inrush':13 'isn':61 'issu':159 'larg':67 'limit':11 'load':68,133 'longer':121 'made':76 'mean':115 'microcontrol':21,59 'mosfet':2,43,101,104 'n':54 'output':18 'pin':60 'power':103 'prematur':28 'prevent':23 'pull':96 'resistor':33,83,112 'room':141 'satur':124 'sinc':1 'situat':131 'step':85 'switch':66,155 'system':73 'take':118 'temperatur':142 'thing':39 'two':81 'type':55 'use':80 'usual':35,57 'voltag':51,78,93 'want':9 'way':114 'weaker':100"
+cross: false
+upVotes: 0
+downVotes: 0
+ranking: 1703715529
+visibility: "visible "
+apId: "https://discuss.tchncs.de/post/8371777"
+editedAt: null
+createdAt: DateTimeImmutable @1703671529 {#1407
date: 2023-12-27 11:05:29.0 +01:00
}
} |
|
Show voter details
|
7 |
DENIED
|
edit
|
App\Entity\Entry {#1883
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#1604 …}
+slug: "MOSFET-gate-resistor"
+title: "MOSFET gate resistor"
+url: null
+body: """
Since MOSFETs have a gate capacitance you’d want to limit the inrush of current from the output of a microcontroller to prevent it from getting damaged prematurely. That’s what gate resistors are usually good for.\n
\n
Another thing is that most MOSFETs don’t fully activate with a gate voltage below 10V (n type) so usually a microcontroller pin isn’t good enough for switching large loads.\n
\n
I have a 24V system and have made a voltage divider using two 10k resistors to step down 24V to 12V as gate driving voltage which is pulled down with a weaker MOSFET. The power MOSFET essentially ends up with a 10k gate resistor this way meaning it will take a bit longer to fully saturate.\n
\n
Is too high harmful? In this situation the load is a heater that activates when the room temperature drops below 18C and deactivates when it gets above 22C so fast switching is not an issue.
"""
+type: "article"
+lang: "en"
+isOc: false
+hasEmbed: false
+commentCount: 4
+favouriteCount: 8
+score: 0
+isAdult: false
+sticky: false
+lastActive: DateTime @1708524566 {#1908
date: 2024-02-21 15:09:26.0 +01:00
}
+ip: null
+adaAmount: 0
+tags: null
+mentions: null
+comments: Doctrine\ORM\PersistentCollection {#2391 …}
+votes: Doctrine\ORM\PersistentCollection {#2369 …}
+reports: Doctrine\ORM\PersistentCollection {#2392 …}
+favourites: Doctrine\ORM\PersistentCollection {#2395 …}
+notifications: Doctrine\ORM\PersistentCollection {#1384 …}
+badges: Doctrine\ORM\PersistentCollection {#1383 …}
+children: []
-id: 25281
-titleTs: "'gate':2 'mosfet':1 'resistor':3"
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+cross: false
+upVotes: 0
+downVotes: 0
+ranking: 1703715529
+visibility: "visible "
+apId: "https://discuss.tchncs.de/post/8371777"
+editedAt: null
+createdAt: DateTimeImmutable @1703671529 {#1407
date: 2023-12-27 11:05:29.0 +01:00
}
} |
|
Show voter details
|
8 |
DENIED
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moderate
|
App\Entity\Entry {#1883
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#1604 …}
+slug: "MOSFET-gate-resistor"
+title: "MOSFET gate resistor"
+url: null
+body: """
Since MOSFETs have a gate capacitance you’d want to limit the inrush of current from the output of a microcontroller to prevent it from getting damaged prematurely. That’s what gate resistors are usually good for.\n
\n
Another thing is that most MOSFETs don’t fully activate with a gate voltage below 10V (n type) so usually a microcontroller pin isn’t good enough for switching large loads.\n
\n
I have a 24V system and have made a voltage divider using two 10k resistors to step down 24V to 12V as gate driving voltage which is pulled down with a weaker MOSFET. The power MOSFET essentially ends up with a 10k gate resistor this way meaning it will take a bit longer to fully saturate.\n
\n
Is too high harmful? In this situation the load is a heater that activates when the room temperature drops below 18C and deactivates when it gets above 22C so fast switching is not an issue.
"""
+type: "article"
+lang: "en"
+isOc: false
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+favouriteCount: 8
+score: 0
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date: 2024-02-21 15:09:26.0 +01:00
}
+ip: null
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+tags: null
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+comments: Doctrine\ORM\PersistentCollection {#2391 …}
+votes: Doctrine\ORM\PersistentCollection {#2369 …}
+reports: Doctrine\ORM\PersistentCollection {#2392 …}
+favourites: Doctrine\ORM\PersistentCollection {#2395 …}
+notifications: Doctrine\ORM\PersistentCollection {#1384 …}
+badges: Doctrine\ORM\PersistentCollection {#1383 …}
+children: []
-id: 25281
-titleTs: "'gate':2 'mosfet':1 'resistor':3"
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+downVotes: 0
+ranking: 1703715529
+visibility: "visible "
+apId: "https://discuss.tchncs.de/post/8371777"
+editedAt: null
+createdAt: DateTimeImmutable @1703671529 {#1407
date: 2023-12-27 11:05:29.0 +01:00
}
} |
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Show voter details
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DENIED
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ROLE_USER
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null |
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10 |
DENIED
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moderate
|
App\Entity\Entry {#1382
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: Proxies\__CG__\App\Entity\Image {#2028 …}
+domain: Proxies\__CG__\App\Entity\Domain {#2021 …}
+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"
+lang: "en"
+isOc: false
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+lastActive: DateTime @1699878324 {#1405
date: 2023-11-13 13:25:24.0 +01:00
}
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+favourites: Doctrine\ORM\PersistentCollection {#2013 …}
+notifications: Doctrine\ORM\PersistentCollection {#2031 …}
+badges: Doctrine\ORM\PersistentCollection {#2037 …}
+children: []
-id: 9441
-titleTs: "'adjust':1 'output':3 'smps':2 'voltag':4"
-bodyTs: "'12v':25 '22v':23 'adjust':37 'aliexpress':10 'anyon':2 'approach':83 'around':22 'best':80 'board':93 'chang':17 'cheap':9 'control':45 'driver':12 'feedback':65 'find':88 'ic':43 'ka3845':50 'led':11 'one':62 'output':19,68 'power':5 're':8 'read':28 'recognis':3 'ref':39 'refer':58,75 'regul':61 'schemat':90 'suppli':6 'thank':95 'understand':55 'unfortun':94 've':27 'voltag':20,40,59,63 'want':15 'way':31,81 'would':77"
+cross: false
+upVotes: 0
+downVotes: 0
+ranking: 1699135408
+visibility: "visible "
+apId: "https://discuss.tchncs.de/post/5757938"
+editedAt: null
+createdAt: DateTimeImmutable @1699049008 {#1385
date: 2023-11-03 23:03:28.0 +01:00
}
} |
|
Show voter details
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edit
|
App\Entity\Entry {#1382
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: Proxies\__CG__\App\Entity\Image {#2028 …}
+domain: Proxies\__CG__\App\Entity\Domain {#2021 …}
+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: 2023-11-03 23:03:28.0 +01:00
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moderate
|
App\Entity\Entry {#1382
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: Proxies\__CG__\App\Entity\Image {#2028 …}
+domain: Proxies\__CG__\App\Entity\Domain {#2021 …}
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+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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App\Entity\Entry {#2469
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Show voter details
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edit
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App\Entity\Entry {#2469
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+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#1604 …}
+slug: "Transformer-question"
+title: "Transformer question"
+url: null
+body: "In a transformer, why are both coils apart from each other? Wouldn’t make more sense to have the ferrite core (tube shape), wind the primary coil around that and then wind the secondary coil on top of the primary? So that the magnetic fields are as close to each other as possible?"
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date: 2023-08-19 22:42:55.0 +02:00
}
} |
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Show voter details
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16 |
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moderate
|
App\Entity\Entry {#2469
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#1604 …}
+slug: "Transformer-question"
+title: "Transformer question"
+url: null
+body: "In a transformer, why are both coils apart from each other? Wouldn’t make more sense to have the ferrite core (tube shape), wind the primary coil around that and then wind the secondary coil on top of the primary? So that the magnetic fields are as close to each other as possible?"
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date: 2023-08-19 22:42:55.0 +02:00
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} |
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Show voter details
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17 |
DENIED
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ROLE_USER
|
null |
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Show voter details
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18 |
DENIED
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moderate
|
App\Entity\Entry {#1586
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#1604 …}
+slug: "18650-li-ion-fire-safety-cabinet-suggestions"
+title: "18650 li-ion fire safety cabinet suggestions."
+url: null
+body: """
Hi all\n
\n
I’m working on a DIY 18650 lithium ion home battery, built out of old laptop/ebike cells that have been tested for performance (capacity, internal resistance and temperature during cycle) and found to be good enough for use.\n
\n
There are several safety precautions in my setup. Each cell has a 1A current fuse and a 60C thermal fuse attached to it(in series). Should a cell overheat or develop an internal short, the cell gets deactivated easily without fancy electronics. (protip, don’t hotglue thermal fuses!) The BMS is a DALY BMS rated for 60A, although I’ll probably never use it above 30. Additionally, an Arduino monitors the individual cell voltages as well as overall temperature (secondary BMS that can communicate over serial to a proper webserver.). This Arduino also watches a smoke detector and controls a solenoid killswitch should anything fishy happen, like overvoltage/temperature or the smoke sensor triggering.\n
\n
This may or may not be a bit overengineered but I want to leave this system running pretty much autonomously with several layers of safety. A Chinese BMS on its own is not good enough and a professional one is outside my budget. Also the learning process is worth the effort.\n
\n
Should, god forbid, a cell actually catch fire despite all safety measures I want to have the battery in a fire safe container as well. An iron cabinet like the IKEA Lixhult won’t melt in case of battery fire but it will vent hot fumes that could set surrounding objects on fire. What would be a good way to engineer that? A metal cabinet with a metal chimney attached to it? So that the hot fumes get directed away from flammable objects? Perhaps something built out of stone where sand bags may be placed above the battery. Fire would cause the sand to drop on the batteries and smother it.\n
\n
There isn’t any way to crosspost on Lemmy right?
"""
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date: 2023-06-26 21:11:26.0 +02:00
}
} |
|
Show voter details
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19 |
DENIED
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edit
|
App\Entity\Entry {#1586
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#1604 …}
+slug: "18650-li-ion-fire-safety-cabinet-suggestions"
+title: "18650 li-ion fire safety cabinet suggestions."
+url: null
+body: """
Hi all\n
\n
I’m working on a DIY 18650 lithium ion home battery, built out of old laptop/ebike cells that have been tested for performance (capacity, internal resistance and temperature during cycle) and found to be good enough for use.\n
\n
There are several safety precautions in my setup. Each cell has a 1A current fuse and a 60C thermal fuse attached to it(in series). Should a cell overheat or develop an internal short, the cell gets deactivated easily without fancy electronics. (protip, don’t hotglue thermal fuses!) The BMS is a DALY BMS rated for 60A, although I’ll probably never use it above 30. Additionally, an Arduino monitors the individual cell voltages as well as overall temperature (secondary BMS that can communicate over serial to a proper webserver.). This Arduino also watches a smoke detector and controls a solenoid killswitch should anything fishy happen, like overvoltage/temperature or the smoke sensor triggering.\n
\n
This may or may not be a bit overengineered but I want to leave this system running pretty much autonomously with several layers of safety. A Chinese BMS on its own is not good enough and a professional one is outside my budget. Also the learning process is worth the effort.\n
\n
Should, god forbid, a cell actually catch fire despite all safety measures I want to have the battery in a fire safe container as well. An iron cabinet like the IKEA Lixhult won’t melt in case of battery fire but it will vent hot fumes that could set surrounding objects on fire. What would be a good way to engineer that? A metal cabinet with a metal chimney attached to it? So that the hot fumes get directed away from flammable objects? Perhaps something built out of stone where sand bags may be placed above the battery. Fire would cause the sand to drop on the batteries and smother it.\n
\n
There isn’t any way to crosspost on Lemmy right?
"""
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date: 2023-06-26 21:11:26.0 +02:00
}
} |
|
Show voter details
|
20 |
DENIED
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moderate
|
App\Entity\Entry {#1586
+user: App\Entity\User {#265 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#1597 …}
+image: null
+domain: Proxies\__CG__\App\Entity\Domain {#1604 …}
+slug: "18650-li-ion-fire-safety-cabinet-suggestions"
+title: "18650 li-ion fire safety cabinet suggestions."
+url: null
+body: """
Hi all\n
\n
I’m working on a DIY 18650 lithium ion home battery, built out of old laptop/ebike cells that have been tested for performance (capacity, internal resistance and temperature during cycle) and found to be good enough for use.\n
\n
There are several safety precautions in my setup. Each cell has a 1A current fuse and a 60C thermal fuse attached to it(in series). Should a cell overheat or develop an internal short, the cell gets deactivated easily without fancy electronics. (protip, don’t hotglue thermal fuses!) The BMS is a DALY BMS rated for 60A, although I’ll probably never use it above 30. Additionally, an Arduino monitors the individual cell voltages as well as overall temperature (secondary BMS that can communicate over serial to a proper webserver.). This Arduino also watches a smoke detector and controls a solenoid killswitch should anything fishy happen, like overvoltage/temperature or the smoke sensor triggering.\n
\n
This may or may not be a bit overengineered but I want to leave this system running pretty much autonomously with several layers of safety. A Chinese BMS on its own is not good enough and a professional one is outside my budget. Also the learning process is worth the effort.\n
\n
Should, god forbid, a cell actually catch fire despite all safety measures I want to have the battery in a fire safe container as well. An iron cabinet like the IKEA Lixhult won’t melt in case of battery fire but it will vent hot fumes that could set surrounding objects on fire. What would be a good way to engineer that? A metal cabinet with a metal chimney attached to it? So that the hot fumes get directed away from flammable objects? Perhaps something built out of stone where sand bags may be placed above the battery. Fire would cause the sand to drop on the batteries and smother it.\n
\n
There isn’t any way to crosspost on Lemmy right?
"""
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