Joule Thief

[xee2]

@ jeanna

The power consumed by the circuit is set by the base resistor value, the transistor gain, and the battery voltage. If you always use the same transistor, and always use fresh batteries, then you can put a variable resistor in place of the 1K base resistor and increase the resistance until the circuit just barely lights the LEDs. If you leave the variable resistor at this value, then you can make changes to the transformer and see if the LEDs are brighter or dimmer.

[electricme]

@ bill,
Some time ago (I think it was you) mentioned on the JT thread about using a wind generator, anyway, I went out to the Dalby wreckers and bought a kids Raser electric scooter, 24v setup, for $5.
This has a chain drive on it so it will be easier to setup, I have a tower in the back yard so its a matter of relocating the tower as the tree grew around it, and fit a prop to the wheel. I believe these small motors can put out quite a few amps.

[electricme]

@ those who know about Fisher n Paykel
check this out lol


jim

[electricme]

@all
F&P stepper motors can be reconfigured as a generator/alternator or as a electric Low Voltage Motor.
These are very interresting things, yep.
If one is made into a DC Motor, it is capable of producing 12 HP, 2 = 24HP, now ehat is enough to turn the wheels of a small size family car.
A job for Ron, later on. lol still no mice in the trap, I can CCCCCCeeeee.


jim

[electricme]

@Xee2 and IST and to the techy theory heads

I have a thought that I want to pass around, OK we all are squeesing every last ounce of energy out of our 1.5v or 1.2v cells using a tiny basic transister, nothing wrong with this, and it works.

I read just now, the transister base current load controls the output, (from Xee2?)
Also Jeanna (whos brain is tired right now, has also dropped a clue), wire sizes.

I havent thought of this from that angle, so here goes, this is where I, myself and I make a fool of myself, lol.

What say someone who has a 2n3055 transister, solders 2 x 2000ohms 5 Watt resisters = 1000 ohms to the base of the transister back to the coils of the juel thief.
The Juel Thief being wound with HEAVY Duty wire, bifilar on a torid.

OK my madness says, we just might get AMPS out of the torid.

Use a 1.2v NiCad ir NmH cell as the current taken from the cell will be huge.
Or setup several 1.2volt cells in parallel to handle current.

Notice, we are not going past the 1.5v limit that we have set from day 1.

8888888888888888888888888888888888

If that fazes you, connect the emitter of the small transister and connect it to the Base pin of the 2n3055 and set them both up as a darlington configuration, but use HD wires for current in and out.

OK, lets throw this idea around in the eather, what do the thinkers say?

jim

@ jeanna, thanks 4 the Ha Ha' s made me laugh too.
I'm waiting 4 all the others 2 wake up and post lol