Maybe a different circuit design would help inspire some new energy.

You can find the info at this site: http://www.nifty-stuff.com/LED-boost...oule-thief.php

Warning: It will suck your batteries to the grave if not charged soon enough.

Attached Images

joule thief 1.jpg (17.1 KB, 15 views)

 

That won't flash, it'll produce a continious light.

You could have a go at reducing the frequency so you can see it flashing but you'd probably need some pretty large components.

Try changing the inductor to between 10mH and 100mH and the capacitor to something like 10µF to 100µF. Failing that try the existing circuit using a flashing LED with a 100µF capacitor in parrallel with it but you'll have to be careful or it'll cook the LED.

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Never aid it would flash. It was a much better alternative than the rusty nail Joule Thief circuit he was working with.
He wans to combine the LED flasher circuit previously posted with something like this circuit.

 

I was going to add Bill Bowden's LED blinker's slow oscillator to my solar garden light circuit but I don't think it works without an additional resistor.

When the transistors finish conducting and then try to turn off, the capacitor doesn't help the transistors turn off and there is no timing. So I don't think it will oscillate.

My modified circuit uses a resistor to ground for the capacitor to discharge then charge in reverse before the transistors begin to conduct.
Since the timing capacitor sees both polarities then it should be non-polar.

Attached Images

LED blinker.PNG (6.7 KB, 8 views)

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