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Picture of the Duracell 1 led torch which uses 1 x AAA battery is here (it didn't seem to upload first time!
There is a Duracell cheap torch which uses only a single cell to drive a white led. It's shown here in this multipack as the 1 led torch:
I bought a few in the UK on their own from Home Bargains for about £1 each. I wish I'd got more. I assumed that as they were a single battery, they would have a voltage increasing circuit but when I took one apart it seems they are genuine white low voltage leds. The only extra component is a current limiting resistor, which it's nice to see. They are bright enough to use as an emergency light and you can read a book by them if you want to.
I suspect the reason they were cheap is because they were part of a faulty production run. In the pictures it looks like they were supposed to take an AA battery, but an AA battery won't fit into the ones I bought. However, they do take a triple AAA although it is very loose and clearly not designed for that.
I intend to use them to make some bike helmet lights, not to see with but just to be seen by. I like the idea of just having one AA battery with one of these at the front through a diffuser and one at the back through a red diffuser. If it works, I'll eventually publish it here. I'm not sure what current they take nor how long they run for as I have them lying about the house for when I need a quick light but they seem to last a long time.
Good luck in finding them!
Ehh...If you don't want to use a specialty LED, you could try using some capacitors that charge in parallel and discharge in series.
Yes! Go to walmart and get their 1 lumen solar light for 97 cents and steal the led out of it. You also get a single 2/3 aa battery and solar cell with transistor circuit that turns lght on at dusk. And your welcome
Posted:Sep 28, 2013
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