I very much like the circuit by Israel Schleicher in EDN Jun 12 2003 for its
ability to drive a 3.6 volt Superbright LED off a 1.2 to 1.5 volt cell with
very minimal and inexpensive components. Since it pulses the LED, greater
perceived brightness can be acheived at great efficiency. See
http://www.reed-electronics.com/ednm...e=6%2F12%2F200
3&spacedesc=designideas

According to the formula, changes to R, L or C could thoretically provide
more current to the bright white LED - I am looking for 30ma average, but in
practice I have not been able to acheive this.

Can anyone tell me where I am going wrong? I would be happy to use three
cells if it helped.

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