Joule Thief

[dasimpson]

very interesting my batter were set to only allow 10ma of power well the led was very dimm i adderd a capaciter across the + and - input lead of the joule thief and the led got brighter

[crowclaw]

@ Bill,

Have a look at this simple constant current regulator for charging your Nicad from the supper cap @ 2.7v The circuit uses the ubicous LM317, just use the formula to work out the resistance value for your charge current... nice and safe. Note the LM317 needs 1.25 volts difference between input and output, so should be OK to dump from your supper cap to Nicad. Merv

[dasimpson]

the ampage draw is 6.06ma here is a pic to see brightness

[dasimpson]

can not wait to get some 2n3904 and see what they will give me

[Pirate88179]

@ Crowclaw:

Thank you very much.  That does look pretty easy to make.  Might come in handy for other projects as well.

Bill