Joule Thief

[xee2]

@ detrix42

@all:  I need some help here.  I do not have an oscilloscope, and so I can't do this my self.  I would like to know exactly what is necessary, component wise, to get a joule thief to oscillate at 174,926Hz.  Or let me know if this is even possible.  A for any help.

Detrix42

It is not possible. The JT frequency shifts with battery voltage, temperature, and load. Perhaps if you use it in a temperature stabilized oven with a voltage regulated power supply it would be stable after running for a long enough time to temperature stabilize. But, I doubt it.

[MrMag]

@all:  I need some help here.  I do not have an oscilloscope, and so I can't do this my self.  I would like to know exactly what is necessary, component wise, to get a joule thief to oscillate at 174,926Hz.  Or let me know if this is even possible.  Thanks for any help.

Detrix42

If you want to just use it for testing, the easiest way would be to use a signal generator on the base of the transistor. I don't think you will be able to get the exact frequency unless you use a very expensive generator. If it works out, you could then built a simple little generator circuit to give you the frequency. To get the most output out of the toroid, you would need to wind the secondary to get the resonant frequency of 174,926Hz. You would probably be better off using a MOSFET for this.

[detrix42]

Thanks Jeanna, Xee, and Mr. Mag.  I guess I will have to purchase a frequency counter, some day.

[innovation_station]

If you want to just use it for testing, the easiest way would be to use a signal generator on the base of the transistor. I don't think you will be able to get the exact frequency unless you use a very expensive generator. If it works out, you could then built a simple little generator circuit to give you the frequency. To get the most output out of the toroid, you would need to wind the secondary to get the resonant frequency of 174,926Hz. You would probably be better off using a MOSFET for this.

i agree mosfet and freq genny ! 

is the easyest way and not a jt ...   just use 1 wire .... !

just 1 wire ..

ist !
you may find a digital multi meter like i have that reads freq!  they work really well i have a expencive true rms meter and it will not read as well as my cheep one wich was not cheep it was 90 bucks ..  but my good one was almost 300 bucks ..  o scope is best it cost me 100 bucks .. and it is old as old can be ...

: )

can i ask why you want exactally 175 khz...  why not 180 ..  or just smack a neo ... : ) ; )
i made a video a long time ago ...  playing with 180khz ...  then i showed 2 tricks .. 1 was negitive grounding through the human body and the other was positive  antanna action ..  intresting my spikes grew big with neg .. and even bigger when i did the pos thing...

: )

http://www.youtube.com/watch?v=CYNEn8llXeU

[detrix42]

can i ask why you want exactally 175 khz...  why not 180 ..  or just smack a neo ... : ) ; )

I have been doing some research in the TPU thread.  This is supposedly the natural frequency of Earth's magnetic field.  I thought if you tuned a JTC to 175KHz, this would resonate with Earth's magnetic field and use Earth's magnetic field to generate more electricity.  I have taken the core out of a flyback transformer, and want to tune a JTC to 175kHz with it, and see if I get any extra juice. 

Detrix42