Joule Thief 101

[Magluvin]

 

Mags

[TinselKoala]

I have a new one going together this evening. Just spoke to Brad about it. Im using a 6mm OD ferrite toroid(input choke off a small cfl circuit board) and starting with 2t by 2t and will step up the turns if necessary incase of operational issues. The reason for beginning with 2 turns is to try and get the operating freq up to where we would need to be to get the core freq to resonate. The 3904 will operate up to 300mhz. Smoky said in a recent post about getting the core into saturation. So smaller core, easier saturation. Especially with the small amounts of power we are dealing with.

Windings will be 30awg. Very short wires so low resistance. Putting on a square of RS circuit board.

Mags

Good for you. Those little toroids work quite well.
You may want to consider other transistors though. MPSA18, BC337-25, perhaps even MPSH10 for your higher frequencies.
Also don't forget about my 6-Pad JT design for circuit board:
http://www.youtube.com/watch?v=wU5x8T2UkuI

[Magluvin]

Good for you. Those little toroids work quite well.
You may want to consider other transistors though. MPSA18, BC337-25, perhaps even MPSH10 for your higher frequencies.
Also don't forget about my 6-Pad JT design for circuit board:
http://www.youtube.com/watch?v=wU5x8T2UkuI

Nice.    Thanks, Ill try some different transistors.

Mags

[Johan_1955]

I don't post garbage but speaking of garbage, how is the "resonant Joule Thief" cumming along?  Anything exciting to post?

For the Engine & Resonance - beginners:

https://www.youtube.com/watch?v=HXsG4McpsqY

http://www.daenotes.com/electronics/microwave-radar/cavity-resonator

Its all the same, in serie and synchronise: https://www.youtube.com/watch?v=bl2aYFv_978

So in harmony and each is contributing, not like mostly on this forum, more clear it can't be!

[ramset]

Yes Cavity resonance would seem a path to results.
your friend Robby squeezing 1HP for every 2CC's of displacement with a Huge standing wave.

here is a very simple Cavity resonance device which has always tickled My Fancy.

https://www.youtube.com/watch?v=oZoiY3FvxKo