Joule Thief

[Mk1]

@TheNOP

To get it to work at the same voltage , at any freq , you just need some more turns , on my first mk1 it had 8 turns jt coil
and gave me 67 volts at any resistance from 1k to 1 ohms , but get higher voltage with 4 turns 100 volts. there are some trade of in both cases. If we had a better way of timing thing at any battery voltage my would help getting higher results .
But for a battery powered device its better to have 8 turns , because when the battery drops to low it doesn't effect the output so much , but for getting better voltage in a small toroid not that good because you need more turns pickup coils .
But no problem with bigger core.

Mark

[Mk1]

@Mk1

I am using the bifilar coil. I just tried it again with 1 and 2 and 3 turns and just the LED tested each side of LED and it will not light?

Any ideas?

remove the jt leds , see what happens , if noting there is something wrong in the connection to the transistor , make sure you got the collector and emmiteur right. also the led on the jt side may not be connected right.

[altrez]

remove the jt leds , see what happens , if noting there is something wrong in the connection to the transistor , make sure you got the collector and emmiteur right. also the led on the jt side may not be connected right.

When you say remove the JT LED. Do you mean the one that is connected to the coil that I have now? I am just a bit confused. I have 10 LEDS running from the JT right now. I just removed all of thoses but the one that is connected to the transistor and bifilar coil. The new coil I added to the Toroid still will not light the the LED. Do I also need to remove the single one connected to the bifilar coil as well? So that the only LED that is connected is the one on the new single wire 3 turn coil?

Thank you so very much for all the help.

[Mk1]

When you say remove the JT LED. Do you mean the one that is connected to the coil that I have now? I am just a bit confused. I have 10 LEDS running from the JT right now. I just removed all of thoses but the one that is connected to the transistor and bifilar coil. The new coil I added to the Toroid still will not light the the LED. Do I also need to remove the singe one connected to the bifilar coil as well? So that the only LED that is connected is the one on the new single wire 3 turn coil?

Thank you so very much for all the help.

Ok , my idea of this circuit is to not use any led on the jt but rather make them run from the pickup coil since when done right one turn can light up to 30 led in parallel then the question will be how many single turn pickup coil can you put on that toroid. and yes you connect the led to the pickup coil only , if you want to see the voltage , you will need diodes.

I hope it make more sense now

Mark

[altrez]

Ok , my idea of this circuit is to not use any led on the jt but rather make them run from the pickup coil since when done right one turn can light up to 30 led in parallel then the question will be how many single turn pickup coil can you put on that toroid. and yes you connect the led to the pickup coil only , if you want to see the voltage , you will need diodes.

I hope it make more sense now

Mark

Mark,

Yes it makes perfect sense to me now. I built my JT with the first LED soldered directly to the transistor and coil. The way I understand your idea to work is that I would simply remove the LED from my JT circuit and then add a 1 wire 1 turn pickup coil on the same toroid. And connect that to my LED bank to see how many LEDS I could run from that one pick up coil.

At that point I would add another  1 wire 1 turn pick up coil and try adding more LEDS to that.

Is that correct?

Thank you!