Solid States Devices > Joule Thief
The angryScientist Joule Thief
angryScientist:
First, I don't want to blow any thing up so I limit the current. E=IR
5mA is not going to melt anything so I'll start with that.
I need to turn on a transistor. I'm going to bias the input of it up to it's turn on threshold. I turn a silicon diode backwards to get a 0.6V voltage drop.
I find the turn on voltage with a potentiometer.
I next take my pickup winding and insert it in between the bias circuit and transistor base. I put the primary between positive and the collector.
The Indicator circuit lights only with a varying voltage. Confirm pickup coil alinement.
I then add my little electron pump circuit to bump up the voltage.
Coil Construction:
High Q coil principals
1) Keep your turns seperate from each other, at least half a wire width.
2) Keep your turns off of the core, at least 1½ wire widths.
3) Keep the coil ends far away from each other.
I take donations if anyone feels the need. ;) My landlord would like it if I paid the rent.
angryScientist:
I get 65.5V with a half dead AA.
gadgetmall:
interesting circuit but wont this blow the transistor base ? It is after all a gate of sorts correct ? . I would love to give you money . If i win you can have some !
Gadget
angryScientist:
It hasn't so far.
I probably should have some kind of over current protection. I would be nice to have something non liner, like a zener, so I could still pick up the small voltages.
I'll have to think about it some more.
I'd like to add more stages of the electron pump and have a large voltage multiplier.
I also have some germanium transistors kicking around. I'd like to be able to exploit a 0.2V potential.
Mk1:
@Angry
Hello Angry , interesting circuit , but i have some questions .
First , i don't see any polarity indication on the schematic for the coils.
Second , what is you end game ? what are you planing on making it do?
I don't mind angry people :D
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