Acme Fixer's highly efficient Joule Thief help needed.

[Legalizeshemp420]

https://www.youtube.com/watch?v=uSVLemZFAbs

The LED is a 3.2V @20ma 16000 mcd variety and the video shows some results I need help with.  The biggest thing I need help with is how to accurately measure efficiency with a scope and a DMM because that is all I have.

[Legalizeshemp420]

Here is the schematic diagram as I can't find the link on his very discombobulated blog.

The one I replicated is the top one and no matter what I changed the frequency would not budge.

[gyulasun]

Hello,

The new blogsite is http://rustybolt.info/wordpress/?page_id=560   

I tried to search for the circuit you refer to above but has not found.  I found this though:

http://rustybolt.info/wordpress/?p=221

By the way he is also a member here if I recall correctly: http://www.overunity.com/13175/25mv-joule-thief-powered-by-peltier-merely-using-our-body-heat-free-energy-247/msg351059/#msg351059

Gyula

[TinselKoala]

Here is the schematic diagram as I can't find the link on his very discombobulated blog.

The one I replicated is the top one and no matter what I changed the frequency would not budge.

What do you mean? There are many things that should change the frequency of any JT circuit. Change just about anything and the frequency will change.  The frequency will change even as the supply battery voltage drops, as the transistor warms and cools, as you change winding numbers or even the position of the transformer wrt the other components.

Are you sure, with your new scope, that you are actually displaying the frequency of the JT's oscillations and not something else? I remember we had some trouble with that when you were using the simulator. Several times you had displays that didn't actually show what the JT was doing but were missing the JT oscs or were showing probe and instrument noise only.

ETA: How many turns on the little toroid? (I had to take apart 3 CFLs to find a 3/8" toroid.)

[Legalizeshemp420]

All I know is that it is hooked up on the anode and cathode of the LED and that 400khz is what I am getting to it.

For those who may have missed the image.