Joule Thief

[Pirate88179]

@ Koen:

Thank you.  First, that cover is nothing more than a flashlight reflector turned upside down.  It was sitting on my work table close by and I looked at it, and it matched the diameter of the VCR head so.......I have no real reason for gluing it on except that it fit so nice and was there.  Yes the bit about the pots being in one position and it accelerates to a point, you add some resistance, it speeds up, once it reaches equilibrium, you set the pot back to where it was (all the way off) and the motor takes off...then you go back to where you were with adding a little resistance and it speeds up again....I have no idea why.  Once you get to this point I had tried to repeat to go even faster but it will not.  I have not yet been able to measure any real output numbers as folks have said I need a scope to see the spikes as my DMMs will not pick them up.  I have received several 300-400 volts shocks (subjective on the amount) and it does charge the charging battery pretty well so...I think it works but to what efficiency, until I find a scope I will have no real idea.  Yes, I agree about the static, there is a slight buzz when you accelerate the motor when it balances at it's equilibrium for that setting, it goes away, run it up higher and the static returns until balance is achieved again.  This noise is very very low and hard to hear and my bearings are very good (so far) which is why I used the really sensitive mike and had my stereo cranked up as well.  Thanks for your kind words and comments.

Bill

[jeanna]

@Koen,
Thank you for that interesting information on carbon.
My toroid was called "charcoal" by allelectronics. It is very small but quite powerful. It seems to me better than most of the others.

@hazens,
Wow, man thank you. for that information.
I also have 5 of these, and I have wound 3 of them.
I too, find them somewhat better than the high perm toroid from goldmine (which I also have 2 of.)

I have wound some close to what you have. I will make a copy today - tonight and tune it and see how these compare. It is really helpful to be using the same toroid as someone else. I think Bill has 5 of these too.

Thanks for being so precise in your measurements and your report. This is very helpful to everyone, because it is meaningful.

@xee,
Thanks for explaining again why the battery cap is there. I have been taking mine out when doing multiple toroid measurements because it causes too much adjustment in some of them. (I put it back when I am just working with one for a while.)

jeanna

EDIT:
I just found the one that is closest to Hazens. This was untuned, and I was looking for other things at the time. I am soo grateful for this reexamination, Hazens,

2N3904
790ohm resistor at base
5T,5T bifilar primary
116 turns secondary/pick up
21V rectified
bjt no led 21.8mA
BJT with 3 leds 24.6mA

there were other things going on like caps in various places etc...

I will first tune this since I now have the precision pots, (and pop in a 2n2222 also) then I will rewind the primary with 7T,7T. and look at the voltage from there.
Thanks again Hazens!

[innovation_station]

i did a second  vid ..  of my input ma draw my out freq... and scope shots ...

enjoy

RAIN DELAYS ....   WE AWAKE NOW!!

IST!

http://www.youtube.com/watch?v=2C6Ej8swnkQ

[electricme]

@ist,
Just going back to your video, I was watching for the sparks as you bridged out the multi ends together, I also didnt see any sparks, I think the reason is, because the wire ends didn't match each end, or there were so many in parallel, some may have missed because several may have been presented back to front.
Hmmm I'm getting toung tied here, if all the (A) ends were soldered together and all the (B) ends were soldered together, then I think a spark would have been forth coming.

This is nice work you are doing IST, I found a microwave oven with a switchmode power supply in it a couple of weeks ago, its main transformer has a very similar parallel winding setup as you have done.
I sat down last night thinking about this for some time.

Using this method of winding many seperate strands in a drill has some merit, as it means you only need 1 torid instead of 50 torids.
A great big hmmmmm indeed.

@Bill,
I also noticed on your video of your bedini. the interference as the drum head assembly spun up, then I also saww the interference dissappear. This was during the close up as you brought the camera close to give us some idea of the sounds it made.

Both videos were excellent.


jim

[MrMag]

IST,

Next time can you stretch out the waveform and set your trigger to channel 1 +.
The waves you are showing on the video do not really mean anything. You can't see the actual waveform.