Joule Thief

[Pirate88179]

Gadget:

I left you a comment and 5 stars a few minutes after you posted your video.  I did not comment here only because I have no idea why that is doing that.  We have been told that you sacrifice amps, mA's for volts right?  But your mA's AND volts are both amplified so, I don't know what to say except, nice work.

I think that is fantastic that you can do this.

Merry Christmas

Bill

[markdansie]

@Albert (Gadgetmall)
I have a spare portable oscilloscope I am happy to send you (you can keep it). I haven't used it for a while and it is a dual trace. this might help you to measure more accurately or possibly explain when you get some abnormalities. Email me markdansie@bigpond.com and I will post it over.
Kind Regards
mark

[Pirate88179]

Mark:

You are a good man.

Merry Christmas.

Bill

[jeanna]

Yes. More current will produce higher output voltage until something saturates.

This was a test of voltage vs turns with everything else constant. Not a test to see how much voltage I could get. The point is that it seems like there is a diminishing return for adding more turns.
...

Hi xee2,
I have been unable to get on here since broli's post yesterday!

I think his reminder about the transistor is useful and yours too.
In my experiments I always keep things the same and move one thing at a time. I know you know this.

Last week I took that big gold that had the original wind of 3T,13T and changed it to 2T,10T like yours and gained a lot of volts from the same transistor/core arrangement.
Then after testing all day, I removed one Turn at a time from the collector wire. (so from 10T to 9T then tested)
The pickup volts went up by about 300v per removed turn. This continued to about 6 turns, and when I removed the next one things went bad. I forget now what I was using to see, but it was visual. 5T stopped or slowed down the results.

So, what I am saying here is that there is a range.
V:T of collector,
900V:10T
1200V:9T
1500V:8T
(I put the scope away at this point, but continued to remove collector turns.)

You are the one who showed me that fewer collector turns made the pickup volts go up. .. to a point this is true.

I am not sure now what has happened, but I am thinking I might have hurt a transistor or 2. At first I thought the breadboard was hurt, and maybe it was, but I cannot get anything from the equivalent cores and winds any more.

I wasted a lot of time trying to make it work as before, but I will see if there are more transistors at RS. Otherwise I need to wait for an order to arrive.

(now, I will keep reading.)

jeanna

[xee2]

@ jeanna

V:T of collector,
900V:10T
1200V:9T
1500V:8T

Wow. You almost doubled your voltage. Great info, thanks. I think we are narrowing in on the best combinations. I wll try some of these on the 150 turn pickup coil. Then I want to try kooler's two toroid circuit. I hope RS has some transistors for you.