Joule Thief

[Pirate88179]

Well, I gave this some thought.  If you put the supercap in parallel with the led then you run the risk of over charging the cap if the energy flows into the cap faster then it is being drained by the led.  This is why I used series so the pulses get absorbed and leveled out on the way to the led and since the led is a diode we do not have to worry about any energy returning back into the cap.

I believe I did this very thing a while back and I will see if I made a video of it...if not, I will make another circuit to attempt to demonstrate what I am saying...or trying to say.

Bill

PS  This has to do with something I found out about supercaps (or possibly any caps?) in that when you hit them with spikes or pulses, they do a much better job of retaining that energy than a battery which makes them very good to use with catching spikes from a JT circuit or the pulses from my earth battery.

[Pirate88179]

This guy made a JT using some SMT inductors:   https://www.youtube.com/watch?v=g2jMrNFV4nQ

I have seen some like this but they are so small I can barely see them.  Now, if he used an SMT transistor and mini led it could be even smaller.

Bill

[Nink]

This guy made a JT using some SMT inductors:   https://www.youtube.com/watch?v=g2jMrNFV4nQ

I have seen some like this but they are so small I can barely see them.  Now, if he used an SMT transistor and mini led it could be even smaller.

Bill

Nice 2 * Ferrite Bead SMT Inductors back to back with and an NPN transistor. Clever. Wouldn't mind seeing a comparison. 

[AlienGrey]

Have a look at this Joule thief the current draw is 50 ma at 2 volt in this case
Have a look at this device it can be tuned for optimal brightness in this case the voltage is 2v at 45 ma in  this case.

Re scop shot freq 95 khz, width +10.25, with - 240, period 10.6 us, 20v cm x10 probe

[Pirate88179]

That looks like a straw hat led...I have some of those and they are very bright for their size.

Well done.  Will that run on 1.5 volts or lower?

Bill