Joule Thief

[broli]

With the latest succes I will try a JT bcap replication but 1000 pages is a huge read. So let me get this straight. The JT is a self oscillating kick back transformer, and the secret ingredient seems to be the ultra capacitors which somehow can store excess energy from this radiant which a battery couldn't absorb. So am I correct that experiments shouldn't be limited to the JT circuit only, since this forum is filled with circuits that can create radiant spikes...is my reasoning correct when these circuits will as well benefit from the ultracapacitors now being able to absorb this radiant energy?

[PaulLowrance]

Jeanna,

Nice circuit drawing! That clarifies Gadgets circuit for me. Attached is the circuit drawing with your corrections, and of course with the slight difference that gadget has added. Is this drawing now correct?

Regards,
Paul

[PaulLowrance]

Hi broli,

Gadget said be careful when buying the bcap at ebay, even though the sells claims they are new. I just bought a 650F bcap (maxwell boostcap) for $30, new, at ebay, part number BCAP650E, Maxwell 650 Farad 2.7V Ultracapacitor. So I'll test it to see if it's fine. Personally I think gadget is thinking of another ebay seller because the guy I bought my from has a flawless ebay rating of no negative comments in the past 12 months.

Mouser.com has this bcaps for $72, but I can't afford that right now.

Paul

[Mk1]

@Paul

The correction you made , are wrong , i believe ... Only one coil goes to the base .

[PaulLowrance]

Jeanna,

One possible issue is that in gadgets circuit he places the LED across the secondary coil, not the transistor. He places a diode & bcap across the transistor. Could you clarify what to do with the LED in gadgets circuit?

Thanks,
Paul