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1 vote

Charging a big capacitor from a weak power supply

It looks like the whole shebang is just not capable of supplying the initial current to the big cap. So when you start up, the output voltage of the oscillator- booster thing collapses, turning off Q2....
danmcb's user avatar
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1 vote

Charging a big capacitor from a weak power supply

I think your circuit is oscillating, but I am not completely sure. You will find that an inverting joule thief topology will work much better: The zener is not yet conducting much, and that part of ...
MicroservicesOnDDD's user avatar
1 vote

Charging for a DIY music player with Li-po battery with TP4056 IC

One way or the other you want overdischarge protection. You can use a dedicated IC (DW01 for example), or, assuming your board has a CPU/microcontroller that still operates at the battery's minimum ...
RJR's user avatar
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0 votes

2S Li-ion charger+protection with reverse protection

I understand your requirement. The solution is quit simple you just need to use the battery with build-in BMS. so you don't need to worry about over discharge and protection circuit. Then you do ...
M lab's user avatar
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3 votes

Charging a mobile phone and laptop using wall plug - Series or parallel circuit?

To add to @russellMcMahon's answer, one major problem with putting loads in series vs. in parallel is that in series, the voltage is split between them, proportionally to their resistance. So if you ...
DoxyLover's user avatar
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5 votes
Accepted

Charging a mobile phone and laptop using wall plug - Series or parallel circuit?

ALL individual loads from a mains power point are in parallel. That means that each can be connected or disconnected individually without interrupting energy supply to any others. Series connected ...
Russell McMahon's user avatar
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