Joule Thief

[Pirate88179]

I am not sure what a 200KHz toroid is. Is it connected to its own transistor?

The rest of what I am picturing from your description is a series connection which would increase the volts and not effect the amps. But you say it decreases the amps?

Please describe this again. I am not following you.
Do you have a way to draw this? That would help I think.

jeanna

if you gave me a fee for helping with your scope... this wouldn't be open source, and I would be obliged to give it to xee and theNOP. But this is open source... just help the next guy.

Or gal.

Ha ha.  but, that is totally correct Jeana.  To me, that is what open source is all about.

Bill       ***EDIT***  I have lost count of all of the folks that have taught me and helped me here, and I try to help folks whenever I can.

[Mk1]

@all

This is a must see !!

http://www.youtube.com/watch?v=kQdcwDCBoNY&feature=channel_page

[Artic_Knight]

OK here is what helps.

Now I understand those among us who seem to always have the 104k cap in parallel to the base resistor.

I wound another primary and got the BJTL to go on with
4TB,11TC,(I have a temporary pickup of 10 turns.)

So, the toroid needs 4T,11T to turn on the led and have it be bright enough. I started to remove some of the 11T from the collector coil and the amps draw started up and the light got dimmer. egads! I started with 11T of each and went down; maybe I should add more than 11 to the collector coil.

The 10T pickup is producing 2.12V but ONLY if I have the 104k cap parallel to the base resistor and the light is in there.
If I pull out the BJTLed, the volts off the secondary go DOWN to 1.8v !!

The frequency is 1.4MHz

I guess I got my high frequency. 

jeanna

hey jenna could you post a schematic drawing of this setup? sounds great! sounds a lot like my current setup but i want to know for sure so i can replicate.

[jeanna]

hey jeanna could you post a schematic drawing of this setup? sounds great! sounds a lot like my current setup but i want to know for sure so i can replicate.

Sure. I need a break right now so I will draw it. It is just temporary, but I will. I am not sure what I said that makes it sound different from what I have done in the past, but I know it is easier when there aren't sooo many words.

Here it is

jeanna

[Artic_Knight]

on that resonance video did you hear the high pitch? i suspect thats the inductor itself resonating like previously described here.  do you think if the inductor vibrated at resonance IE little current was needed to keep it vibrating it could induce a magnetic current itself?... wonder how that works......