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App\Entity\EntryComment {#2020
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App\Entity\EntryComment {#2020
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+body: "It’s similar to AC-DC. From a simplistic perspective, efficiency at idle will be 0% because the converter itself still uses *some* power, then efficiency increases with load since the converter overhead becomes less significant as the useful work increases. Googling “dc dc converter efficiency curve” gives plenty of results."
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App\Entity\EntryComment {#2020
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+body: "It’s similar to AC-DC. From a simplistic perspective, efficiency at idle will be 0% because the converter itself still uses *some* power, then efficiency increases with load since the converter overhead becomes less significant as the useful work increases. Googling “dc dc converter efficiency curve” gives plenty of results."
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App\Entity\EntryComment {#2460
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App\Entity\EntryComment {#2460
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App\Entity\EntryComment {#2460
+user: App\Entity\User {#261 …}
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10 |
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App\Entity\EntryComment {#2326
+user: App\Entity\User {#261 …}
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edit
|
App\Entity\EntryComment {#2326
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App\Entity\EntryComment {#2326
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App\Entity\EntryComment {#2040
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#2452 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#2360 …}
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+body: """
The 7333A is a linear regulator, which means it drops voltage by converting power to heat. Typically those make sense when the input voltage is close to the output voltage or the load is *very* small. If it’s getting too hot, the load is high enough that the efficiency will be very bad…whether or not this is a problem depends on your application.\n
\n
Some random site claims 170mA and another claims up to 400mA. 170mA * 8.7V (12V in minus 3.3V out) = about 1.5 watts, which is too much for a TO-92 package.\n
\n
Can you use a tiny buck converter instead? Or a larger package for the linear regulator that can add a small heat sink?\n
\n
As for your actual circuit, the second transistor is an interesting idea (you’re using it to invert the state so you can have the GPIO pulled in the non-problematic direction?) and I don’t have enough experience to give further suggestions.
"""
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Show voter details
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App\Entity\EntryComment {#2040
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The 7333A is a linear regulator, which means it drops voltage by converting power to heat. Typically those make sense when the input voltage is close to the output voltage or the load is *very* small. If it’s getting too hot, the load is high enough that the efficiency will be very bad…whether or not this is a problem depends on your application.\n
\n
Some random site claims 170mA and another claims up to 400mA. 170mA * 8.7V (12V in minus 3.3V out) = about 1.5 watts, which is too much for a TO-92 package.\n
\n
Can you use a tiny buck converter instead? Or a larger package for the linear regulator that can add a small heat sink?\n
\n
As for your actual circuit, the second transistor is an interesting idea (you’re using it to invert the state so you can have the GPIO pulled in the non-problematic direction?) and I don’t have enough experience to give further suggestions.
"""
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16 |
DENIED
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moderate
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App\Entity\EntryComment {#2040
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The 7333A is a linear regulator, which means it drops voltage by converting power to heat. Typically those make sense when the input voltage is close to the output voltage or the load is *very* small. If it’s getting too hot, the load is high enough that the efficiency will be very bad…whether or not this is a problem depends on your application.\n
\n
Some random site claims 170mA and another claims up to 400mA. 170mA * 8.7V (12V in minus 3.3V out) = about 1.5 watts, which is too much for a TO-92 package.\n
\n
Can you use a tiny buck converter instead? Or a larger package for the linear regulator that can add a small heat sink?\n
\n
As for your actual circuit, the second transistor is an interesting idea (you’re using it to invert the state so you can have the GPIO pulled in the non-problematic direction?) and I don’t have enough experience to give further suggestions.
"""
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Show voter details
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17 |
DENIED
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18 |
DENIED
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moderate
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App\Entity\EntryComment {#2081
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Show voter details
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DENIED
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edit
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App\Entity\EntryComment {#2081
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Show voter details
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moderate
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App\Entity\EntryComment {#2081
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22 |
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moderate
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App\Entity\EntryComment {#2341
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date: 2023-12-01 16:06:00.0 +01:00
}
} |
|
Show voter details
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24 |
DENIED
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moderate
|
App\Entity\EntryComment {#2341
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#2343 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#2360 …}
+image: null
+parent: Proxies\__CG__\App\Entity\EntryComment {#2336 …}
+root: Proxies\__CG__\App\Entity\EntryComment {#2335 …}
+body: "LFP cells have excellent cycle life anyway (2000+ cycles); is it worth worrying about staying at 95%?"
+lang: "en"
+isAdult: false
+favouriteCount: 1
+score: 0
+lastActive: DateTime @1701443160 {#2062
date: 2023-12-01 16:06:00.0 +01:00
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"@Saigonauticon@voltage.vn"
"@ignotum@lemmy.world"
"@nilloc@discuss.tchncs.de"
]
+children: Doctrine\ORM\PersistentCollection {#2339 …}
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+editedAt: null
+createdAt: DateTimeImmutable @1701443160 {#2096
date: 2023-12-01 16:06:00.0 +01:00
}
} |
|
Show voter details
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25 |
DENIED
|
ROLE_USER
|
null |
|
Show voter details
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26 |
DENIED
|
moderate
|
App\Entity\EntryComment {#2071
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#2067 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#2360 …}
+image: null
+parent: Proxies\__CG__\App\Entity\EntryComment {#2070 …}
+root: Proxies\__CG__\App\Entity\EntryComment {#2049 …}
+body: "What are you switching? There’sa good chance (but no guarantee) even an ultra-cheap switch is fine."
+lang: "en"
+isAdult: false
+favouriteCount: 1
+score: 0
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date: 2023-06-20 04:08:15.0 +02:00
}
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+children: Doctrine\ORM\PersistentCollection {#2048 …}
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-id: 1263
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+editedAt: null
+createdAt: DateTimeImmutable @1687226895 {#2130
date: 2023-06-20 04:08:15.0 +02:00
}
} |
|
Show voter details
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27 |
DENIED
|
edit
|
App\Entity\EntryComment {#2071
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#2067 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#2360 …}
+image: null
+parent: Proxies\__CG__\App\Entity\EntryComment {#2070 …}
+root: Proxies\__CG__\App\Entity\EntryComment {#2049 …}
+body: "What are you switching? There’sa good chance (but no guarantee) even an ultra-cheap switch is fine."
+lang: "en"
+isAdult: false
+favouriteCount: 1
+score: 0
+lastActive: DateTime @1687226895 {#2093
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}
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"@shoeforthepot@discuss.tchncs.de"
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+children: Doctrine\ORM\PersistentCollection {#2048 …}
+nested: Doctrine\ORM\PersistentCollection {#2056 …}
+votes: Doctrine\ORM\PersistentCollection {#2046 …}
+reports: Doctrine\ORM\PersistentCollection {#2045 …}
+favourites: Doctrine\ORM\PersistentCollection {#2050 …}
+notifications: Doctrine\ORM\PersistentCollection {#2052 …}
-id: 1263
-bodyTs: "'chanc':8 'cheap':16 'even':12 'fine':19 'good':7 'guarante':11 'sa':6 'switch':4,17 'ultra':15 'ultra-cheap':14"
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+editedAt: null
+createdAt: DateTimeImmutable @1687226895 {#2130
date: 2023-06-20 04:08:15.0 +02:00
}
} |
|
Show voter details
|
28 |
DENIED
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moderate
|
App\Entity\EntryComment {#2071
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#2067 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#2360 …}
+image: null
+parent: Proxies\__CG__\App\Entity\EntryComment {#2070 …}
+root: Proxies\__CG__\App\Entity\EntryComment {#2049 …}
+body: "What are you switching? There’sa good chance (but no guarantee) even an ultra-cheap switch is fine."
+lang: "en"
+isAdult: false
+favouriteCount: 1
+score: 0
+lastActive: DateTime @1687226895 {#2093
date: 2023-06-20 04:08:15.0 +02:00
}
+ip: null
+tags: null
+mentions: [
"@shoeforthepot@discuss.tchncs.de"
"@jjagaimo@lemmy.ca"
]
+children: Doctrine\ORM\PersistentCollection {#2048 …}
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+reports: Doctrine\ORM\PersistentCollection {#2045 …}
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-id: 1263
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+editedAt: null
+createdAt: DateTimeImmutable @1687226895 {#2130
date: 2023-06-20 04:08:15.0 +02:00
}
} |
|
Show voter details
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29 |
DENIED
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ROLE_USER
|
null |
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Show voter details
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30 |
DENIED
|
moderate
|
App\Entity\EntryComment {#2125
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#2165 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#2360 …}
+image: null
+parent: null
+root: null
+body: """
> Do I just connect thermal pads to the ground plane and call it a day?\n
\n
Yup.\n
\n
> Wouldn’t that make the components hard to solder with hot air?\n
\n
Sorry, I’ve never tried hot air assembly.\n
\n
> Do I make an isolated polygon that only acts as a thermal pad?\n
\n
Ideally the copper area is big to spread out the heat. If you have an isolated polygon it can’t spread very far and buys you less cooling.
"""
+lang: "en"
+isAdult: false
+favouriteCount: 0
+score: 0
+lastActive: DateTime @1706461902 {#2066
date: 2024-01-28 18:11:42.0 +01:00
}
+ip: null
+tags: null
+mentions: [
"@RedBauble@sh.itjust.works"
]
+children: Doctrine\ORM\PersistentCollection {#2041 …}
+nested: Doctrine\ORM\PersistentCollection {#2100 …}
+votes: Doctrine\ORM\PersistentCollection {#2105 …}
+reports: Doctrine\ORM\PersistentCollection {#2111 …}
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+notifications: Doctrine\ORM\PersistentCollection {#2103 …}
-id: 347387
-bodyTs: "'act':45 'air':28,35 'area':53 'assembl':36 'big':55 'buy':74 'call':12 'compon':22 'connect':4 'cool':77 'copper':52 'day':15 'far':72 'ground':9 'hard':23 'heat':60 'hot':27,34 'ideal':50 'isol':41,65 'less':76 'make':20,39 'never':32 'pad':6,49 'plane':10 'polygon':42,66 'solder':25 'sorri':29 'spread':57,70 'thermal':5,48 'tri':33 've':31 'wouldn':17 'yup':16"
+ranking: 0
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+visibility: "visible "
+apId: "https://lemmy.ca/comment/6812595"
+editedAt: null
+createdAt: DateTimeImmutable @1706461902 {#2074
date: 2024-01-28 18:11:42.0 +01:00
}
} |
|
Show voter details
|
31 |
DENIED
|
edit
|
App\Entity\EntryComment {#2125
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#2165 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#2360 …}
+image: null
+parent: null
+root: null
+body: """
> Do I just connect thermal pads to the ground plane and call it a day?\n
\n
Yup.\n
\n
> Wouldn’t that make the components hard to solder with hot air?\n
\n
Sorry, I’ve never tried hot air assembly.\n
\n
> Do I make an isolated polygon that only acts as a thermal pad?\n
\n
Ideally the copper area is big to spread out the heat. If you have an isolated polygon it can’t spread very far and buys you less cooling.
"""
+lang: "en"
+isAdult: false
+favouriteCount: 0
+score: 0
+lastActive: DateTime @1706461902 {#2066
date: 2024-01-28 18:11:42.0 +01:00
}
+ip: null
+tags: null
+mentions: [
"@RedBauble@sh.itjust.works"
]
+children: Doctrine\ORM\PersistentCollection {#2041 …}
+nested: Doctrine\ORM\PersistentCollection {#2100 …}
+votes: Doctrine\ORM\PersistentCollection {#2105 …}
+reports: Doctrine\ORM\PersistentCollection {#2111 …}
+favourites: Doctrine\ORM\PersistentCollection {#2102 …}
+notifications: Doctrine\ORM\PersistentCollection {#2103 …}
-id: 347387
-bodyTs: "'act':45 'air':28,35 'area':53 'assembl':36 'big':55 'buy':74 'call':12 'compon':22 'connect':4 'cool':77 'copper':52 'day':15 'far':72 'ground':9 'hard':23 'heat':60 'hot':27,34 'ideal':50 'isol':41,65 'less':76 'make':20,39 'never':32 'pad':6,49 'plane':10 'polygon':42,66 'solder':25 'sorri':29 'spread':57,70 'thermal':5,48 'tri':33 've':31 'wouldn':17 'yup':16"
+ranking: 0
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+downVotes: 0
+visibility: "visible "
+apId: "https://lemmy.ca/comment/6812595"
+editedAt: null
+createdAt: DateTimeImmutable @1706461902 {#2074
date: 2024-01-28 18:11:42.0 +01:00
}
} |
|
Show voter details
|
32 |
DENIED
|
moderate
|
App\Entity\EntryComment {#2125
+user: App\Entity\User {#261 …}
+entry: Proxies\__CG__\App\Entity\Entry {#2165 …}
+magazine: Proxies\__CG__\App\Entity\Magazine {#2360 …}
+image: null
+parent: null
+root: null
+body: """
> Do I just connect thermal pads to the ground plane and call it a day?\n
\n
Yup.\n
\n
> Wouldn’t that make the components hard to solder with hot air?\n
\n
Sorry, I’ve never tried hot air assembly.\n
\n
> Do I make an isolated polygon that only acts as a thermal pad?\n
\n
Ideally the copper area is big to spread out the heat. If you have an isolated polygon it can’t spread very far and buys you less cooling.
"""
+lang: "en"
+isAdult: false
+favouriteCount: 0
+score: 0
+lastActive: DateTime @1706461902 {#2066
date: 2024-01-28 18:11:42.0 +01:00
}
+ip: null
+tags: null
+mentions: [
"@RedBauble@sh.itjust.works"
]
+children: Doctrine\ORM\PersistentCollection {#2041 …}
+nested: Doctrine\ORM\PersistentCollection {#2100 …}
+votes: Doctrine\ORM\PersistentCollection {#2105 …}
+reports: Doctrine\ORM\PersistentCollection {#2111 …}
+favourites: Doctrine\ORM\PersistentCollection {#2102 …}
+notifications: Doctrine\ORM\PersistentCollection {#2103 …}
-id: 347387
-bodyTs: "'act':45 'air':28,35 'area':53 'assembl':36 'big':55 'buy':74 'call':12 'compon':22 'connect':4 'cool':77 'copper':52 'day':15 'far':72 'ground':9 'hard':23 'heat':60 'hot':27,34 'ideal':50 'isol':41,65 'less':76 'make':20,39 'never':32 'pad':6,49 'plane':10 'polygon':42,66 'solder':25 'sorri':29 'spread':57,70 'thermal':5,48 'tri':33 've':31 'wouldn':17 'yup':16"
+ranking: 0
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+visibility: "visible "
+apId: "https://lemmy.ca/comment/6812595"
+editedAt: null
+createdAt: DateTimeImmutable @1706461902 {#2074
date: 2024-01-28 18:11:42.0 +01:00
}
} |
|
Show voter details
|