7 votes

Circuit to light up LED only once

simulate this circuit – Schematic created using CircuitLab Dare I suggest something as crude as the circuit above? The only quiescent current is the leakage through the capacitor. D2 is there ...
  • 15.4k
5 votes
Accepted

Powering ESP32 and two MG90S using supercapacitor

Summary: Small LiIon cells (maybe two in series) may meet your requirement but to minimise size and mass you may need to be prepared to use devices outside their ratings. This is doable in some cases ...
  • 144k
3 votes

Circuit to light up LED only once

The 74C14 (unbuffered) hex schmitt inverter has a static whole package (6 inverters) current of typically 50 nA at 15V supply and maximum 15 uA across the temperature range. At 25C it will usually be ...
  • 144k
2 votes

Powering ESP32 and two MG90S using supercapacitor

To evaluate different types of energy storage, a Ragone plot is useful like: from: S. J. Moura, J. B. Siegel, D. J. Siegel, H. K. Fathy and A. G. Stefanopoulou, "Education on vehicle ...
  • 1,994
2 votes

Circuit to light up LED only once

I am not sure this will work. I didn't simulate it. But some variation should work. simulate this circuit – Schematic created using CircuitLab
  • 26.4k
2 votes
Accepted

Why is my lead acid battery suddenly dead?

You overdischarged it, and probably it's old besides. As lead-acid discharges, on the one electrode, lead sulfate builds up -- an insulator. This is why internal resistance increases as the battery ...
  • 6,506
2 votes

Solve this puzzle: Car lighter port blowing phone battery

The lighter port is a 12V high current source. I speculate that it is difficult to break. To use it to charge a phone, there must be a 12V to 5V adapter (USB style??). The charging adapter is ...
  • 3,489
1 vote

Solve this puzzle: Car lighter port blowing phone battery

This sounds more like a failure of the alternator/voltage regulator system in your Jeep, causing voltage spikes above the acceptable ~12V to ~14V range. You can test this with a voltmeter that has a ...
  • 3,290
1 vote

Does Li-po battery swelling constitute a significant fire or explosion risk?

Just an answer with an academic paper with very many references: Qingsong Wang, Binbin Mao, Stanislav I. Stoliarov, Jinhua Sun, "A review of lithium ion battery failure mechanisms and fire ...
  • 3,693

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