Joule Thief

[xee2]

   The fool proof two transistor circuit I posted turns out to not be so fool proof after all. The TIP31C will overheat if the power supply is able to supply high current. A resistor of a few ohms had to be placed in series with the power supply to prevent overheating. The resistor is not required with the cell phone charger since it will not supply sufficient current to overheat the TIP31C.

A better solution is to only use the 30K resistor to start the circuit. In this case the TIP31C does not overheat.

[innovation_station]

i wonder why the 3055 cans rarely get hot .. 

many times i have used them 12vdc car battery .. with out heat .. 

even tho i have fryed 1n4007 .. up in smoke  the transistor .. ice cold ..

i used 1000v 3 amp and they get burning hot ..  while chargeing a boost cap ..

agin 3055 can ice cold ..  270 ohm .. 0 portection 4001 feedback ..

?

W

[detrix42]

GOOD JOB
Is this not a wonderful circuit?

It is possible to get 1000 volts from a 1.2v battery so, maybe.
The volts are spikes, however.
They work well with fluorescent bulbs and leds.
I will watch your youtube videos to see if I think your neuman motor can use spikes.
That would be very cool if so, because you could use a AA or 2 of them instead of a 12v. But I might be greedy.

So, welcome to this illustrious thread of experimenters. I am glad to see a motor maker here!

jeanna

Hey, thanks Jeanna.  I would accept even say 200 to 300 volts right now.  I believe I just need a big enough cap to  capture the spikes and deliver a DC voltage to my motor.  Now I am trying to remember how to hook up multiple caps.  In series, does their voltage capacity increase or parallel?

[detrix42]

detrix,

  There are videos online with the JT running small motors and filament bulbs
http://www.youtube.com/watch?v=eiLcbTBewhw

E

thanks for that video link. Now to watch it a few hundred time to understand everything he is doing.

[slayer007]

In this video I wanted to see the best performance I could get out of a 1.3v AA battery.
The Exiter is running right off the AA battery lighting a 15W FL tube while lighting 40 LED'S and charging 10 other AA batteries.
It's using around 25 mA from the rechargable battery.

Here is the video.

http://www.youtube.com/watch?v=Xyg31OSkAIE