Joule Thief

[nievesoliveras]

@all

There are lots of transformers here:
http://www.wellgainelectronics.com/index.asp?PageAction=VIEWPROD&ProdID=1217

This specific one is: I5A EE19 PHOTO FLASH TRANSFORMER
I dont know if it is the same as the one graphed by @groundloop.
Does anybody has tried one of these?

Jesus

[xee2]

@nievesoliveras

Web site shows turns ratio of about 1:10. My guess is that you would need 9 volts instead of 1.5 volts.

[xee2]

@nievesoliveras

I think this circuit may work using Radio Shack 8-1200 ohm transformer. But, I have not tested it (and do not plan to) so build at your own risk. Use large toroid so that it will not get saturated. Please post results if you build it.

[Mk1]

Using 2 joule thief on a single toroid,i made the coils like this picture using one pnp and one npn so one feeds from positive side of the battery and the other the negative , i am planing on using the excess energy to feed back the circuit helping with the battery consumption the goal would be removing it removing it.Then add coil around the toroid to get power from the induction .

Any comment or input would be appreciated greatly , so far the coils and transistor are working so i have 2 JT working wired up like picture
now i am working on the feedback circuit.red and yellow for pnp and blue and green for npn.

[nievesoliveras]

@xee2

Thank you for the information and the circuit. I bought the only small transformer that radio shack had it was an audio transformer #273-1380. And it cannot turn on a neon bulb connected to the circuit I made from the disposable cameras given to me. The circuit is included on this post.
The Transformer used on the circuit has six legs, but only five have connections. The circuit connections are exactly as shown. The transformer is viewed from top. It works but it does not turn the 14watts CFL bright enough.

@mk1

That graphic looks promising!

Jesus