Joule Thief

[Mk1]

@ist

You are still making welding machines .

[innovation_station]

@ist

You are still making welding machines .

thats ok

here is the next video ..  where it blew the adaptor with out a spark gap .... lol

ist!

http://www.youtube.com/watch?v=SCuOb_5Wvhc

[Pirate88179]

... I need a mosfet which cuts on when a voltage is applied.  Enhancement mode perhaps...

I hate to post so succinctly ..The idea is to salvage current flowing through the B-E path. ..theoretically, the MOS could be daisy chained..

Edit:

I'm wondering what happens to a diode when there is no current flowing through it, but only voltage? ..does it just act like a gate instead? ...is a diode current dependent?

Well, here is one thought on the diode question.  A lot of us here have and are lighting LEDs with just voltage...well, very little current and higher voltage and they continue to work.  Since they are diodes my vote (guess) would be that regular diodes work on voltage as well.  When use in a bridge rectifier they can convert high voltage AC into DC.

Bill

[broli]

thats ok

here is the next video ..  where it blew the adaptor with out a spark gap .... lol

ist!

http://www.youtube.com/watch?v=SCuOb_5Wvhc

Ah that's too bad. I assume you have already tried this, but what if you didn't use the JT and hot the two leads of the adapter...would the sparking still be that intense? And when you say radiating, do you mean heat or sound vibration?

[innovation_station]

when i say radiateing i mean MAGNETIC RADIATION ..

hold a magnet near it ...  it feels like it will blow apart from the inside ... 

i have an ac adaptor i will use in my next test and send it through a bridge ..

first ..

ist!