Joule Thief

[Pirate88179]

dasimpson:

Nice job.  That looks like a bright light to me.  You are on your way now.  I am looking forward to seeing what you do next.

Bill

[dasimpson]

yeah i could never get my power draw below 65ma then i thoght i wounder what happens it i put a pot between the + of the battery and the + of the joule this so befor connecting the joule thief i ran my meter + after the pot and the - to the battery set meter for amps and well as i ajusted the pot the ampage went down but the voltage satyed the same

this is cool cos no matter what i do nothing can draw more then 10ma the strange thing is i thoght the joule thief would pull the full 10 but it dosent seem to also i have a pot instead of a resister and the really funny thing is as you ajust the pot the light gets brighter then dim then brighter again and so on amlost like im changing gear
also putting a cap inline with the battery after the pot made thing brighter

[dasimpson]

im on page 555 now 10 posts per page i have noticed alot of ppl on here are getting attacked now something seems strange here were after free power and were been hacked alot just a note wont to be safe move away from windows full stop after reading this far i haved moved to ubuntu to do my reserch in fear i maybe next call me a conspircy nut but dose seem rather a big coinsadence

i used ubuntu as it is the most easy os i have found to install no drivers needed it forces things to work

[jadaro2600]

noted that all my joule thiefs start at around 10 ma at 1.25volts just need a way now to ajust the voltage so i can see what voltage they will start at these are dimly lit btw i need to find a whay to get the full brightness yet

this informatin should then tell me what i need from my earth battery

Voltage is an interesting thing to try to control.  Potentiometers may have a variable voltage drop - it just depends on the current.

When your light goes out, more current will flow through your circuit than when it's on.  At least, this is what I've notice with my JTCs.

You should rather, try to operate one considering that the voltage drop across an LED is usually as rated.  You have a voltage gain in the circuit.

You might want to invest in multiple DMM's ..have one hooked in parallel with a small electrolytic capacitor to measure current and another to take various voltage measurements.

I have several craftsman model DMMS, they each measure voltage, current, in various decimal places, as well as frequency up to 10mHz.  One has a transistor tester, but I'm really at a loss as to what the numbers are supposed to mean. Both of them have temperature probes and can take relative measures with a hold function.

- - - -

One of the things I do to measure voltage is hook up the circuit and measure the voltage across the resistor ( wherever it is ) ..subtracting this from the source voltage should give you the voltage across the rest of the circuit on that path.

Correct me if I'm wrong.

[dasimpson]

calulations are over my head lol

well mindight here most of my test joule thief have been dead by 6 am so time for a longivity test with my new setup
drawing about 5ma from a fully charged 1.2 volt battery at 2500mah this could be ahwile lol
if my calulations are right this chould be about 500 hours omfg