Joule Thief

[IotaYodi]

Schematics or drawings like the ones that kooler or slayer make are fine... possibly even better for most people to follow

Its much quicker for everyone. Long explanations take time to digest and unless you have a photographic memory you have to re read the text. Drawings speed things up tremendously. Using cryptic language just slows things down even more. What kooler did is the way to go if everything is stated. You can print it out and just start building. Though it may take more time to do, having a set of pictures of electronic parts can be easily gathered to save time when doing it this way.
Good stuff folks!
frank

[crowclaw]

Hi All,

Just put together this JT circuit for those who are interested. This uses a small 2n7000 mosfet N channel device. For this experiment I have used a 28+28 turn toroid. 1.75" outer diameter 3/4" inner diameter 1/2 thick, bifilar wound with 9 strand hook up wire ( don't use mag or insulated copper) Supply = 3 volts, current draw = 10Ma. Output unloaded just under 80 volts. See photo's.   

[crowclaw]

Photo shot of my JT toroid using FET device.

[crowclaw]

@ kooler

This idea for presenting your diagrams is first class for any one who can't read schematics. Let's hope that things don't get to complecated though!... must take you some time to do, excellent presentation. Merv

[jeanna]

Hi All,

Just put together this JT circuit for those who are interested. This uses a small 2n7000 mosfet N channel device. For this experiment I have used a 28+28 turn toroid. 1.75" outer diameter 3/4" inner diameter 1/2 thick, bifilar wound with 9 strand hook up wire ( don't use mag or insulated copper) Supply = 3 volts, current draw = 10Ma. Output unloaded just under 80 volts. See photo's.

Hi crowclaw,
What does it do at 1.5 volts?
So we are working with all the same fruit so to speak, we try to stay with the single AA (or D) battery so the input is 1.2-1.6v.
So, please let us know what you get with one single, because it will be comparable.

I have some mosfets in my shoebox, but never tried them.
What is your reason?

Also, please wind a 10-30 turn secondary using mag wire around the toroid, then using both ends on the probes, have a look on the scope too. (and please show it too??)

thank you,

jeanna