Joule Thief

[jadaro2600]

So, I made my own version, following what was outlined in the B plan on this page:http://www.talkingelectronics.com/projects/LEDTorchCircuits/LEDTorchCircuits-P1.html

And I'm having trouble figuring out how much power it's consuming,  I measure across the leads on the LED and I get a 1.1 volt reading and a 26ma current draw - Is this where i'm supposed to measure the power consumption?

Voltage isn't kicking up - and I don't know how to measure the cross frequencies.  Any suggestions?

[gadgetmall]

@jadaro2600
      Hello .Congrats on making your joule thief .I have studied all those schematics on there months ago and Decided we here have the Best Circuits on the internet . I Suggest you stick around and read up a bit . Mk1 and Jeanna fusion mod is a good one and Xee2 has good ones . I personally have one that draws less than 0.81 ma running  with 4 bright Leds off dead battery's they are all here on the Pirate thread !  As explained in previous post you measure the current draw  with your amp meter in series with the battery . We are makin Power now !!

[gadgetmall]

@mk1 the hall effect sensor are cheap here http://www.allelectronics.com/index.php?page=search&search_query=hall+&x=17&y=6

2 for a dollar or you can salvage them from a VCR  . they are inside the drum head !


also here is a diagram of  amagnetic levitating device using a coil and a hall sensor to adjust the field

[nievesoliveras]

@Mk1
Is there an expert on Hall Effect stuff here. 
Nope but I have had an idea I posted quite a few back.


Get a redundent floppy disk drive, look under it, there is a big flywheel, it has a small magnet that flyes round and round, it passes by a tiny black transister, this is a hall effect transister I beleive, (sorry I was wrong).

*** EDIT *** by Jim,
I Just pulled apart 2 floppy disk drives,
There is NO hall Tr there, sorry guys, my mistake, I was so sure there was one there.
There is a tiny magnet which passes by a tiny wire wound ferite, this is glued to the pcb.
This must be some type of sync pulse or tacho thing for the motor RPMs.

OK lets start fooling around with Hall Effect Transisters, these things are expensieve.

These things sence a magnetic field and turn on or off, same as a transistor, but thats all I know, I can see more studdy time  coming up lol.

General Jim

Hooroo, Gotta pak 4 weekend, will try to keep up to date by my laptop.

@bill,
I was a bit crook this morning, will PM u soon as soon as I''m " outa the woods". 

The hall effect works only with the positive side of the magnet if you want it to work with the negative side you have to put it with the back in front of the negative pole.

@all

Congratulations to all experimenters here!
Thank you for your work and inspiration!

Special thanks to @captain !!!!!!!

Jesus

[slayer007]

I was thinking about making a fox hole radio.
And replace the head set with a rectifier and see if I could get enought voltage to run a JT.

Here is a link that shows how to build one.

http://bizarrelabs.com/foxhole.htm