The angryScientist Joule Thief

[crowclaw]

@ Angry Scientist,

Nice circuit based on voltage doubler/tripler techniques to increase your volts output. Whilst you can achieve high voltage output with this configuration you are limited with current! ... depending on what you want to do with it of course.

[angryScientist]

Ha! I let the battery sit for the day, added a 10-turn pot. I'm getting 94.5V unloaded.

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?

Here is the polarity.
I'm not sure what you mean with your second question.

I have loved the voltage multiplier concept ever since learning it. Beautiful, isn't it?

[jadaro2600]

Here is something similar..but not entirely.

What do you mean by electron pump?

[allcanadian]

@Angryscientist
I built the exact same circuit a while ago and it seems to work pretty well but there are limitations. At higher voltages/input current the reverse voltage from the cap/inductance will blow your transistor in this respect the standard JT with a blocking diode is more robust. As well timing is more of a factor, if the cap value is incorrect it can mess with the circuit timing. This circuit does show some interesting effects which depend on the type of transistor used but at larger power inputs things go terribly wrong, lol.
Regards
AC

[angryScientist]

@Angryscientist
I built the exact same circuit a while ago and it seems to work pretty well but there are limitations. At higher voltages/input current the reverse voltage from the cap/inductance will blow your transistor in this respect the standard JT with a blocking diode is more robust. As well timing is more of a factor, if the cap value is incorrect it can mess with the circuit timing. This circuit does show some interesting effects which depend on the type of transistor used but at larger power inputs things go terribly wrong, lol.
Regards
AC

Thanks allcanadian,
I can see how you would be correct. I'll see what I can do to correct this circuit, if possible. Thanks for your experience. We all want a perfected circuit, don't we?

@jadaro2600

What do you mean by electron pump?

It's the basis for a voltage multiplier. It is a pump. The capacitor acts like a diaphragm or piston, first pulling then pushing the 'electron fluid' through the check valves.