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Joule Thief
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SirPeale:
I've been wanting to replace the green LED on my computer case with a blue one I scavenged from an LED pen that the batteries died in. Direct replacement won't work because the LED is expecting at least 3 volts, but the computer only puts out two.
Saw a great project on Make a couple days ago - the Joule Thief.
edit: that's the SMT version... here is the regular version .
Figured I might be able to scavenge parts off some TV chassis and motherboards I've got lying around.
I took a C3199 thinking I could use it (it's a NPN transistor) but in all the schematics I've read it calls for parts that cross to an NTE123. It didn't work, and I can't find a part to scavenge.
I don't know enough about electronics to know *why* it doesn't work, can anyone explain?
Ed_McCarron:
Is C1399 a house marking? It didn't pop up in many searches.
My guess? The gain on the part might be wrong. Oscillators can be kinda finicky.
SirPeale:
Typo - C3199.
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