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Here's a video of a circuit I made which flashes an LED, using only power collected by the LED: https://youtube.com/watch?v=BM7VDOoFIWI https://youtube.com/wat
by tomn 5y ago
Here's a video of a circuit I made which flashes an LED, using only power collected by the LED:
https://youtube.com/watch?v=BM7VDOoFIWI https://youtube.com/watch?v=BM7VDOoFIWI
The LED is the component on the left; there's a very dim flash (pretty much just the black die turning red) at around 11s, then every few seconds.
I can't remember exactly how it works... I think there's two capacitors charged up to the voltage of the LED in parallel through high-value resistors, and a circuit that shorts the +ve of one to the +ve of the other to put them in parallel.
It only just works at a very specific light level. IIRC some of the transistors are used as very low leakage diodes rather than transistors, as the regular diodes I had we're too leaky.
- blueflow 5y agoNow this is the most impressive thing i've seen today! Especially because its made out of discrete components. Kudos.
- tomn 5y agoThanks! I'm not sure what integrated components you could use for this, as anything useful would probably use more current than the LED can provide.
- mrtksn 5y agoCool, it's a self powered light meter. The more light there's in the environment the more frequent the blink. Maybe can be adjusted to have less frequent, shorter lasting but more powerful flash!
- giantrobot 5y ago> Maybe can be adjusted to have less frequent, shorter lasting but more powerful flash! This should be called a Goku circuit. Kaaaamaaaaikaaaaaa.