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We use a lot of rechargeable batteries at home, and I can never tell which ones work and which ones need to be recharged, and finding out is a pain be...
1 LED (any color) 1 NPN Transistor 1 Old AC adapter (preferably a lower voltage than the one I used) Resistors in accordance with the voltage and curr...
Because 1.5V is not enough to power an LED on its own, the whole circuit runs off of an old charger (AC adapter). The one I used provides 12V at 1A, w...
You may want to set up the circuit on a solderless breadboard first to test it. Solder all the parts together, insulating with heat-shrink tubing. Use...
The only thing left to do is put this thing in a container. I used an ugly old flowerpot. You can think of something more elegant.
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