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