hey folks
i got a stupid question..
do any of you know how long a jt runs when it is pulling 104 ma's..
sorry to bother anyone .. i know i need to learn the math
the battery was from my wii and it had 1.2volts left in it..
so i thought at 104ma it should run down quick..
but 24 hours later it still has 0.79 volts and the led is still full brightness.. it's really to bright
i don't know the mah of this battery it is a cheap eastpower from china

thanks

ps.. stprue very nice video.. you have done alot with that circuit..

robbie

hey folks
i got a stupid question..
do any of you know how long a jt runs when it is pulling 104 ma's..
sorry to bother anyone .. i know i need to learn the math
the battery was from my wii and it had 1.2volts left in it..
so i thought at 104ma it should run down quick..
but 24 hours later it still has 0.79 volts and the led is still full brightness.. it's really to bright
i don't know the mah of this battery it is a cheap eastpower from china

thanks

ps.. stprue very nice video.. you have done alot with that circuit..

robbie

This isn't a stupid question.  Depending upon the 'state' of the source voltage, a joule thief circuit may in fact use more milliamps when it's close to its death. ..the cut on voltage for the transistor has a lot to do with this, but I've noticed on my models that when there's no load on the device, it uses more current than when there is.  So...

Bearing that in mind, it's a good idea to keep a load on ( the secondary ) or off the collector or somewhere in this circuit.

Also, you'll want to keep in mind that batteries have a tendency to regain their charge voltage wise after a sudden discharge, so a joule thief might cut off, then cycle on and off again before it's really 'dead'.

The math is relatively simple, if you have a 2450mAh battery, then you have 2.45 amps or 2450 miliamps at your disposal for one hour.  Batteries, again, can be somewhat deceptive, as it may in fact be capable of supplying 3 or 4 amps over the life of a complete slow drain.

Sticking to the basics:  using 100mA your circuit will run for 24.5 hours it just a matter of turning mAh into mA.

Depending on your configuration, there will come a voltage point that the transistor will stop turning completely on and the current will simple bleed through to ground via the base-emitter path.  This is when the device may consume more milliamps that when it would loaded and the battery will become depleted for the duration of it being connected.

The only way to know is to compare the battery's performance to one which you know the properties of - this would be rather difficult because of the differing properties of manufactured AA cells (or what have you) and the various 'states' the circuit source finds itself in.

Hello folks.  I have built my second JTC.  Pictures below with schematic.

The third pic is about my question.  I want the output of the JTC to go into the transfomer in pic #3.  All I know about the transformer is the ohms of the windings. I am not sure how to do this.  Can some one supply a schematic or some guidance?

I am very happy with this JTC.  The input voltage is only 6.5v, and I am getting 100+v on the output across the capacitor.  I am a Newman motor advocate, and want a JTC to supply the voltage to my Newman motor. 

For those here I will post a link t my Newman motors.  Just in case any here are interested. 

http://www.youtube.com/watch?v=F6qLiAeyPng
http://www.youtube.com/watch?v=fdw3DAVuLbA
http://www.youtube.com/watch?v=EnLqEeO7Af4

I want my JTC to supply power to my large motor.  Motor #3

....  I want the output of the JTC to go into the transfomer in pic #3. 


I am very happy with this JTC.  The input voltage is only 6.5v, and I am getting 100+v on the output across the capacitor.
I want my JTC to supply power to my large motor.  Motor #3

What happens?
Nothing?

You do understand that the joule thief is giving you pulses, don't you?
Pulsed volts are very different from battery volts.
If your motor requires 340 dc volts, you will need something like kooler's, but much much larger.
How many amp hours are in those batteries? and how long does it take to run them down?

Really a brush motor is a heavy amps user isn't it?
There are virtually no amps to be available from a joule thief.
What am I missing?

BTW, the coils are beautiful. You must have a lot of patience...(or chocolate  )

thank you,

jeanna

What happens?
Nothing?

You do understand that the joule thief is giving you pulses, don't you?
Pulsed volts are very different from battery volts.
If your motor requires 340 dc volts, you will need something like kooler's, but much much larger.
How many amp hours are in those batteries? and how long does it take to run them down?

Really a brush motor is a heavy amps user isn't it?
There are virtually no amps to be available from a joule thief.
What am I missing?

BTW, the coils are beautiful. You must have a lot of patience...(or chocolate  )

thank you,

jeanna

and what happins when your intrupt the flow with some amps behind it ..... 


CARE TO TALK OF MY WORK ?

W

how about  A HOLE BUNCH OF AMPS IN THE FLASH OF A SPARK !

OR WAS IT A FRACTION OF A NANO SECOND ??

What happens?
Nothing?

when I hook up the other transformer, all I get is the input voltage, but I am not to sure if I have the second transformer hooked up right.

You do understand that the joule thief is giving you pulses, don't you?
Pulsed volts are very different from battery volts.
If your motor requires 340 dc volts, you will need something like kooler's, but much much larger.
How many amp hours are in those batteries? and how long does it take to run them down?

Yes I do understand that the joule thief is pulsing/osculating, and as far as I know I need that osculation to go into the other transformer to step the output of the joule thief.  Going from 6.5v to 100v is awesome.  The theory of a Newman motor is to uses as little current draw as possible. Right now the coils resistance is up to 1155 ohms. As I add more wire, the resistance goes up and the current draw goes down.  According to Newman, all I need is the voltage, which is why I eventually I want 1000v with just milli-amps of current. (micro-amps if I can get it that low).

Really a brush motor is a heavy amps user isn't it?
There are virtually no amps to be available from a joule thief.
What am I missing?

At the moment, yes it draws a lot of current.  I did a crazy test.  I uses a 330uF cap, and using my JTC I charged the cap to 100v. then took the cap to my motor, and applied the cap as the source.  The motor moved just a little bit.  330uF * 1155ohms = .38115 seconds to discharge the cap.  Again, once I add a lot more wire, and get resistance up, the discharge time will increase, and once the motor gets going I will only need a fraction of a second to keep it going.  I am very happy that the motor move a tiny bit.  Very happy.  things are on track. Now to get that other transformer to work. 

I also plan on getting a automobile's ignition coil as my JTC coil.  Or one of those disposable camera transformers. 

BTW, the coils are beautiful. You must have a lot of patience...(or chocolate  )

thank you,

jeanna

And thank you so very much for the kind words.  I am impressed with seeing the LED in your plants pot.  Great job.

a mot primary and a yoke  and 5vdc pulsed by hand yeilds over 2000v

as per my tests long time b4 the jt

regards!

W

i built it from JUNK

LOL WHAT HAVE YOU DONE ?  i built it with out a transistor what have you done ?  i built it with a single wire what have you done ?


just incase you for got i built a pulse motor with 1 single wire 1 reed switch and 1 aa battery that it wobble tuned

good god

what have you done ? 

thats 3 freqs from 1 single  in 1 wire .. and then i made the damm thing self run

AGIN I ASK WHAT HAVE YOU DONE ...


and GUESS WHAT ....  : ) MY GIVE A DAMM IS BUSTED!

: ) http://www.youtube.com/watch?v=wgW0ZIRzrkY

i want to feel something ..  let me digg a little deeper...  naw still nothing ....

@detrix

    If you change your motor to run on high frequency it may be easier than making a jule thief which produces real highfrequency from low current.  A high frequency motor is what they use on aircraft because they are smaller faster lighter and pack a bigger punch per pound.  They operate at about 40ohz.  A pulse motor can operate at thousands of hzs.  The steel core is what holds you back.  Some day not too far in the future there will be ceramic motors of 100s of horsepower that way 30pounds.  The magnetic bearing and hightech ceramics is making this doable.  The pulse motor links usually to a flywheel that changes the hf pulses to a more usable form of power.