Hey Guys, I'd like you to take a look at the following circuit. It is powered by 3V or 6V. With 3V on the input you get 80V out and with 6V you get 200V out. I know that the transistor (JE200, not 2N3502) produces the AC signal and amplifies the voltage, but what does the transformer do? I want to power it with a 9V battery and have an adjustable potentiometer from 200V to 0V. Can someone explain how I calculate the correct potentiometer value? Thanks!

I made a mistake, with a 3V input you get 80V out and with a 6V input you get 200V out. The actual circuit only consumes 70mA at 3V and 250mA at 6V. Now that I think about it, I'll bet the transistor produces the AC and the transformer amplifies the voltage...hope i'm right. I'm still not sure how to calculate the correct pot value...

Nevermind! I figured it out once more, apparently the minimum current a person can feel is 1mA. So I'm going to use a 500K pot - 200V/500,000 = 0.4mA. This should work fine. Below you'll find the changed circuit:

How many little 9V batteries are you going to power it with? Its current will far exceed the small amount of current available from a 9V battery. The transformer applies positive feedback so that the circuit oscillates and the transformer steps up the voltage. Your pot has nothing to do with current through a person. If the value of the pot is too high then the circuit simply will not work.

Thanks Audioguru, I suppose I'll have to install a DC-DC converter... What pot value would you suggest? Not sure how to do it since I dont know the current...

Hey Guys, Do any of you know of a 3V input 6V 250mA ouput DC-DC converter? I also need to know how to calculate what pot I need on the output of this circuit.

You do not need a DC to DC converter and you do not need a potentiometer. Make the circuit the way it was designed and limit its output current with a resistor from its output to the person. Use a 6V battery.

Well, I am going to put it in a compact case so i dont know... I would like the pot to adjust the shock level from 0V to max.