Joule Thief

[stprue]

@ Jeanna

You are correct, the phone charger is a simple transformer that bumps 1.5v to 5.5v...ish and the light on the transformer usually indicates current.  There are other videos that show similar set-ups using 1.2v rechargeable but the booster is nice.  This set up is good at low voltage wireless and has lots of potential!

Have fun experimenting...Stew 

[crowclaw]

@sirmikey1,

Hi, I initially used the circuit as shown to charge up a high voltage capacitor to approx 140 volts for use in another project design. My experimental JT has a bif wound primary & secondary of an equal number of turns (in this case 22 ) so with the additional diode connected to the primary I could now make use of the negative going spikes. If you look at my scope shots channel A and channel B are of equal amplitude but A = +ve spikes and B = -ve spikes. The sum total of the combined outputs therefore is twice that of just one single output. So I was able to charge my capacitor to twice the output voltage I would normally be able to do by using a single diode off of the collector. The resistors are purely for loading  while testing and measurement purposes only. Note the outputs are symmetrical only if the number of primary turns equal the number of secondary turns. The type of diodes can make a difference to the results especially at very high frequencies as some standard silicon diodes are not fast enough. Depending on individual circuit configurations; this circuit can be tried out for lighting modified CF L's / charging caps etc. BTW the outputs are + and - spikes and digital meters don't like them!! use decoupling HV capacitors  at the outputs to smooth out the DC. Hope this proves useful Regards.

[jeanna]

@ Jeanna

You are correct, the phone charger is a simple transformer that bumps 1.5v to 5.5v...ish and the light on the transformer usually indicates current.  There are other videos that show similar set-ups using 1.2v rechargeable but the booster is nice.  This set up is good at low voltage wireless and has lots of potential!

Have fun experimenting...Stew 

So stew,
The battery run time? Did you test it?
Is it only 2 hours?

I made jonny's version of this and got the av plug to show a weak response, but the oscillations only lasted a few moments, which was long enough to show that it works, but also to show that 1.2v is a little too weak, and  as lidmotor said, it really works with the 5.5v charger.

Thank you for the confirmation,

jeanna

[stprue]

@slayer

Check out this one!

http://www.youtube.com/watch?v=nhqML81VO_M&feature=channel

[Mk1]

@all

I still have not build a AV plug , to tell the truth i have no clue where to start.

Any recommendation would be great , i want to try it on the tube .

Diodes to used ?

Mark