Joule Thief

[guruji]

Kooler this is very interesting. Did you try to input more volts and see what happens on the output?
Can you please give more info on parts of this circuit?
Thanks keep expermenting

[xee2]

Kooler


If I am understanding  you  right     L2 and    your 1.5 uF cap make a resonant circuit ........so   the   light bulb would be lit  with AC

That would be a very efficient way to do it .

gary

The inductor does not do anything except act a small resistor (wire resistance) because what comes out of the capacitor after the bridge is DC. It might provide some smoothing for the pulses charging the capacitor, but the capacitor provides much more so I am not sure the inductor provides any benefit.

[sm0ky2]

kooler nice circuit.

i did something a little different,  trying to power my 7-inch coil.
i used an in-line rectification method, by putting a diode (led) on each end of the secondary of my smaller coil. one going in, one going out - which produces a pulsed DC, but you essentially lose the oter half of the A/C. anyways... trying to copy my EB set-up, i placed a (biased) 4700 microfarad cap (35v cap) in series with the larger coil.
i managed to dimly light an LED on the secondary of the 7-inch coil, but when i measured the cap it read 91volts.
so i thought to turn it off, and discharge the cap before trying something else..  now, my energy equation puts that around 19 joules? i think.. which EXPLODED in a golf-ball sized fireball of electricity, when i shorted across the terminals....

ever since then ive been using a bridge , and A/C caps, to oscillate between the DC pulses and the collapsing field.

the rectified secondary output of my small (1-inch) joule thief measures 70v @ 6ma. thats after all the diode-losses.

[kooler]

you probably right about the inductor it just seem to charge the cap faster while using the output
i would say i probably wrong but i am going to do some different configuration soon
mostly using a scr to dump it more thur a 1:1 toroid filter to get a different output
like a tazer setup but lower voltage
i get to feeling better i will update you guys

[kooler]

oh i meant to you all that if i run a small 3v battery in ..
i can discharge the 3uf cap fast enough ..
i can take to leads and shoot constant sparks like i welding... its pretty kool
just don't do it to long it will weld the leads together