Joule Thief

[Pirate88179]

MK1:

Nice work!  So, you made this circuit scream like the Fuji circuits then?  That must mean there is some serious oscillation going on there.  My wire has always been the 22 ga. stranded wire and I am guessing here, the only difference would be the single wire would have less resistance maybe? (maybe not)  I didn't see it in the photo but you said you used the bridge rectifier? (I wish we could see the photos while posting here)  So, if correct, then your output was pure DC.  what was the purpose of the tie wraps?  I have seen this on toroids before but I have no idea why folks use them.

Please forgive all of my stupid questions.  I am up late and I can't sleep.  Do you think it was the 3904 transistor that was making that sound?  Have you tried to isolate where it was coming from?  On the Fuji circuit, it was the transformer emitting the noise as far as I could determine. Someone said this was due to the wires in the coils moving at high freq. vibration.  Do you think the wires on your toroid were moving making this sound? ***EDIT*** I see you said it was the LED.

OK, enough questions for you.  Excellent work.  One day, folks will go back and look at what we have all done and say......"So, that's how they came up with this."

Bill

[Mk1]

@pirate

The picture is the toroid before modification, and the tie wraps came with the toroid i just used it like that,
I Really wish i had a cam, it is really the led , the coil doesn't move it i reverse the led it lights but doesn't buzz.

I will have to order a camera from the universe , but it already gave clear seeing and that is already enough,

I guess that toroid told me to leave her be . I am just rewarded.

The jt the smallest high power transformer. Next the tpu thief. 

Edit: the single strand stays on the toroid easily and packs tight , more turns per space.

[electricme]

@ MK1
Thats very good news you have there, this is a good success for you and gives us all a boost as well.
I have only wound my torids with very fine wire, it came out of the microwave cooling fan field coil, I don't want to rush this, but I will begin to wind torrids with thicker wire shortly.


@ all

I'm charging Caps, think I'm charging bats, and making 12v fans work, but only one at a time.

Yesterday, I was very dispondent over the failure of my 2nd torrid coil, the one I made up with the 12 tap switch attatched to it.
To recap, the torrid is being driven by my 1st Jule Thief, by one of the 2 seperate coils.

The second torrid HT coils were getting extreamly hot, so there must have been a short or something else causing this effect.
There was no output from the HT section, nothing. So I put it aside and went to bed.

Today I made a couple of changes to this HT coil, I took the bridge diode out, on the LT input, replaced it with a single diode in line with the output from the JT, hooked up the multimeter to the HT and saw voltage. I clicked the switch shaft and the output voltage rose each time the switch went to another position. I added another Diode to the other side of the feed from the JT and this improved it further.

I got it to get up to 70 volts AC, so that was nice to see.

I now decided to add the Bridge Diode I had previously removed, and put it on the HT output, this rectified the output voltage.
I managed to charge a 400v 220uF capacitor, to 40volts, this gave a good snap on shorting the clips.
I replaced this with    a 200v 470 uF capacitor, it charged to 35v, It discharged similar

I have a 35v 1000uF capacitor, and this has been on this circuit for about 2 hrs with no probs

I connected a second NiCd as a batt to be recharged, it is too soon to see if it is charging.
I connected a 12v PC power supply fan (0.11A) to the 35v 1000uF cap and it ran for a couple of seconds.
I removed this and replaced it with a smaller 12v DC fan (.08A) and it ran for about 3 seconds.

Next step is to remove the 12v DC fan and try it with a 5v Laptop miniture fan, just to see if this will work for a longer period of time.
I think it will, lets hope the smoke stays inside it ha ha, however I might put a 500ohm pot in series with it, better the pot fries than the 5v fan, they are too hard to come by.

Will get back to you all to let you know what happens.

jim 

[rensseak]

@ MK1:

Well, I am the first to admit, I can't keep up with this topic.  I wish this was all I had to do every day.  Actually, this is my favorite part of my day, checking OU dot com for responses and posts.  I pulled a 1.25" OD ferrite toroid from an old computer power supply.  It was already wound with a bunch of turns of what appeared to be magnet wire.  But, it was not wound in a bifilar manner so I am going to remove that wire and use this one to make a JT also.  I now have 4 of these and that will make 5.  You would think I would know all about these by now, but I don't.

I was hoping those zaps from the Fuji circuit would make me more intelligent and activate parts of my brain I am not using.  This did not seem to work as of this writing.

Bill

You know what, I have here also a 1.25" toroid from an old computer power supply and also not wound bifilar. But i conect two of the wires in the JT fashion and it lits also the LEDs.

Norbert

[nievesoliveras]

@all

I just finished reading all the posts that I was behind.
I congratulate all of you. We are going on the right direction.

Jesus