Joule Thief

[Mk1]

@timmy

Since it is a diode it can be used to direct current like the bridge , there many types of diodes , this is a good one to experiment with, you just need a way to use it .

Mark

[timmy1729]

@timmy

Since it is a diode it can be used to direct current like the bridge , there many types of diodes , this is a good one to experiment with, you just need a way to use it .

Mark

Precisely. Any ideas?

[electricme]

@ all
Back again afta a sleep 

@ MdMiller,
Welcome to our JT forum, I agree, enthusiasm is contagious, as AddaRue mentioned to you for Pirates and our binefet, regarding the relationship to the Nathan Stubblefield coil he made ie IRON wire and copper wire.
To be honest I never thought of using iron wire, now I will get some, where are you my faithful magnet, I need to take you shopping with me, lol.

YES, Duane, Bridge Diodes can be made out of IN4007 diodes, they have a higher rating breakdown, I bet you are thinking to use it on your HV side of the transformer.

I just did a little test on a bare almost black torrid, it seems not to have any conduction properties, perhapse someone could verify this also?

@ JohnnyDavro,
I think you have the best output so far with a JT, it is awsome that you can get your stepper motor up to high speed, on a single 1.5v batt, awsome, and driving 25 LEDS at the same time, unbelieable. Well done Sir.

Now I had a real scary thought, I believe a record is going to be broken before this week is out, if JD JT gets a new rewind using Iron wire, how much will he get in output,. I had another thought, what would happen if the windings in a run of the mill generator had iron wire instead of copper wire? hmmmmmm

@ Timmy,
Oh man, go ahead and blow fuses, transistors, LEDs burn out coils, burn out PC fans and transformers, you will learn it norman in electronics research, only way to learn, sides it is good fun doin it.

@ jesus,
Thanks for the crt with the pulse motor, now this is what I will try next time.
BTW, will your crt drive the very small stepper motor ion the back of a floppy drive? here is an opertunity to use this small motor for a different purpose.
A few years ago I modified a car wiper motor to lift my kitchen sash window up and down, power comes from a PC PS.

@MK1,
I forgot to mention that I am using a small fillament bulb in my circuit, I once made a frequency Sine/Square generator as a test instrument, I had to use 2 bulbs, forgot why for, but it was necessary. Anyway I just added them into my JT crt, between one of the output leads going to the input wires of my second HV JT.
Come to think of it, I did have overheating on my second torrid, now I dont, hmmm again.

I'll take a pic and post it shortly.
jim

   

[electricme]

@ all
Here is a photo of the Bulb Globe in JT circuit.
jim

[electricme]

@ timmy
This is for Timmys benefit, although everyone could use this as well, and is off the JT topic but could be related to it.

I picked up a couple of security B&W monitors (2CCD camera switchers built in) cheeply last weekend, after they were running for a couple of hours I could smell hot transformer Plug Pack. Upon touching them, they were very very hot indeed.

Time to get serious, as the black plastic might melt later, lucky for me, they had 2 philips head screws, this alowed me to get to the guts of the matter. Inside, they have a bare bones 240v - 12v AC tranny, AC rectified 4 IN4002 diodes in bridge fashion, smoothing taken care of by a 16V 1000uf cap.

I cut out a big area of the plastic bottom of the casing, moveing the output lead to the case side. Soldered the leads of a 12v DC CPU fan to the miniture PCB and affixed the fan tio it.

I then drilled 20 x 1/8" holes to the top of the caseing, reassembled all and test.

The fan screems its head off with no load, turn on the monitor (and cameras) and the fan noise falls dramaticly, this tells me there is a miss match in the current out from the transformer, at least I tried to fix the heating prob, now it runs much cooler, but I still am not happy with it.

Photos 0272 and 0271

jim