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Re: [Phys-L] batteries vs capacitors



Yes. It's also called a Battery Eater. I have two like this:

www.coolest-gadgets.com/20091207/battery-eater/

Lights blink for many hours on very low voltage.


Phys-L@Phys-L.org writes:
There’s a HomeBrew LED Driver Circuit known as the ‘Joule Thief’
that will light up a white (or any other color) LED from a single AAA
cell, even one that is close to completely ‘dead’.

It is charge pump oscillator that works nicely over a broad range of
input voltages.


On Jan 29, 2014, at 2:30 PM, John Denker <jsd@av8n.com> wrote:


You might also google for LED driver circuits:
http://www.google.com/search?q=LED+driver+circuit
e.g.
http://www.diodes.com/datasheets/ZXLD381.pdf

Such a thing is well worth the trouble if you are
trying to use the available energy efficiently.
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_______________________________________________
Forum for Physics Educators
Phys-l@phys-l.org
http://www.phys-l.org/mailman/listinfo/phys-l