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Don't use a transistor either, cause NO resistor, or capacitor, or inductor will destroy the transistor.
Try to use a high current TO-3 NPN and wind the base coil with 31 gauge wire, that might survive with no resistor.
I have made joule thieves without resistors, but transistors in a TO(@ package will overheat. Use a MJE3055T or better. Almost amy resistor will work somewhere close in that range. Surely you can find one?
Anything close to 1k should do fine. i wouldn't do it without a resistor though. would allow a bit too much current through Ib.
You can use a few small resistors in series or a couple of larger (say 2.2k) in parallel to get something close to a equivelant resistor.
2 500 ohm in series maybe? Or any other combination that will equal 1000.
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Posted:Jul 15, 2014
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