Joule Thief

[hazens1]

A Pulce Width Modulation power supply does the same thing to control the speed of a DC motor.
But this different to the raising or lowering voltage.


My TWV I posted a few pages back uses the same principle to give the effect of the LEDS going round and round, but its circuit switched the LED ON, for a certain time, then the next LED is switched on and so it continues for eva.

Here are some simple PWM and expandable light sequencer circuits I have been planning on combining with a JT. Have not had the time yet, but maybe someone else does 

[nievesoliveras]

@all

Congratulations to all that have attained success!
I cannot deviate from my goal.  Feedback to the source!!!

@hazens1

Which is the correct circuit for the 555 assisted 43 LEDs. (photo included)
I was going to ask what was that IC circuit there, but you posted some circuits that hint that it is a LM555.

thank you in advance.

Jesus

[stprue]

@ Hazens1

I have tried to replicate your 7-7-70-70 1 inch coil with no luck, I think due to the fact that the wire is all the same color, so I must have crossed something.  Could you post some additional pictures so I can see where everything is going? 

Thank you very much

[TheNOP]

Now I can "see" that torrids are not the only method one can use to make a hi voltage, but I also knew that the WC is used in some "bug zappers and in some negative iron air purefiers.

even with voltage doubler there are losses, less then with transformer, but they have draw back too.
currents limitations is only one of them.

My main reason on posting, was, what would occur, if I fed the JT output back into a transformer, and get it to make an amp output.
I'm sorry if I was not too clear about this, but I somehow think I have my answer.

Now I am thinking we need to be switching amps into/through the Joule Thief to get a usable amperage output.

it will work to some extend.
i remind you that jeanna showed that she can light leds with only one turn on the pickup coil.
assuming a 7:1 ratio, the currents should be 7 times greater then the primary and voltage 7 times lower.

what you can do is make the collector coil 1000 turns and the pickup coil 1 turn.
the problem will be: is the transistor will be able to withstand the mag field collapse spikes...

an other side effect will be that the load won't change the primary's impedence the same way.
you can concider this as a "good" or as a "bad" thing depending on what you are expecting of your circuit.
ex: primary currents going high with more load, or down with more load.

in electronic there are always tradeoff, choices to make, to get the job done more efficiently and how we want it.
feeding a transformer into a transformer is, in my opignion, not the best thing to do.

[Mk1]

@all

I have resumed to testing on the mk1 hv , i made a diode bridge from 1n4007 , since my other bridges could not withstand the voltages , so 15 foot pickup coil , it gives me anything between 850 and 500 v rectified dc playing with the base resistor .

I think the pickup coil is a bit to much , i will try shorter ones , this one is strange when charging a cap it starts slowly and then start its high pitch noise and start charging fast real fast .

@gadget

I will send you one core as soon as i can !

Mark