Joule Thief

[Mk1]

@xee

thanks That is what i tough , i was surprised when my last coil did not lower the pulse. 

[xee2]

@ Mk1

@all

Could anyone tell me what happens to the jt regular output when you put a resistor load on it , or even close the secondary (closed circuit) , Would the voltage go down between the collector and battery negative rail , or stay the same or up.

Anyone.

Try it. I think shorting secondary will reduce collector pulse voltage.

[xee2]

@ Mk1

I am confused because on my tp unit , i can't shot circuit the secondary , and the jt side is still fine , put i make 2 secondary one on a white led (2 turns)
And a red led (4 turns) , both light , and the collector and negative rail doesn't even flinch.

Well, 2 turns and 4 turns are not much inductance. How many turns are on the collector coil? Usually the pickup coil has a lot more turns than the collector coil.

[Mk1]

@ Mk1

Well, 2 turns and 4 turns are not much inductance. How many turns are on the collector coil? Usually the pickup coil has a lot more turns than the collector coil.

Ok What i did is make a bigger one 22 turns 18 gauge , and closed the secondary got 33 volt pulses for 39 volts open. It dose lower it a bit.

Collector 36 turns 24 gauge.

[xee2]

@ Mk1

As I recall, all of the open pickup coils do not absorb any energy. But any pickup coil that has a load will take energy away from the other coils.