Lighting a white LED with a single cell

[Roff]

I haven't tried this, but you LED aficionados might want to.
**broken link removed**

 

[Hero999]

I bet the piezo transducer makes a horrible noise.

What's wrong with the Joul thief?

It probably costs less and is more efficient.

The only time I'd do it this way is if I wanted to power a piezo buzzer and an LED at the same time from a 1.5V cell which is never.

 

[RODALCO]

Google for Joule Thief as Hero999 said.

Simpler and works very well. 1.5 Volt battery will still light LED at < 0.4 Volts

 

[whiz115]

nice alternative!! but no better than joule thief...

 

[mvs sarma]

This can perhaps be useful as a turn signal indicator for Bicycles, where the buxzzer ensures that the signal is switched ON.