physicsman

modified 11 years ago

Joule thief

241

5930

5d 09:23:15

Version 3.0: positive sinusoidal output

Start the simulation with the switch to the cap open. Run at 10 micro sec. Watch the pattern for a few cycles, then close the cap switch, and run at 200 micro sec. As i recently discovered, this is nearly identical to an Armstrong oscillator. But its still cool to smooth the output. Let me know what you guys think.

published 11 years ago

gavinq

11 years ago

None

rishadpk

11 years ago

good

sagar_shah

11 years ago

Wat is dis??

RickRoland

11 years ago

Wts dat??

physicsman

11 years ago

Think of the joule theif circuit like a voltage booster, or pump. The conservation of energy is preserved, so your still using the same wattage to run an LED, your just able to do it from a much lower voltage source. This also means you will kill that 1.5 v battery at a faster rate then normal. However, considering this circuit was originally built to run on so called "dead" batteries, i guess any account of time you get is above and beyond just throwing them out!

physicsman

11 years ago

The capacitor is optional. In the simulator, the wave form comes out smoother. In practically building this circuit, you don't need it. At these frequencies, the human eye can't see the LED flicker.

thebugger

11 years ago

Wow 60khz and you are practically able to fry the led (well thats what the apps shows). This would drain the battery very fast. But the oscillator part is perfect.

physicsman

11 years ago

Try playing with the mH value, of the transformer, and/or the resistance value on the base of the transistor. Sim speed as well

tiggerroo

10 years ago

Whenever I try to get to your circuit the whole everycircut app restarts

R31N

10 years ago

@tiggerroo same here.. and I got gs5, so I dont think it's my phone

sssnrf

10 years ago

This crashes the app for me too...

prathamesh3099

10 years ago

I VE ASUS ZENFONE 5....when i tried to open the circuit.......Crashed....!!!app restarted automatically

FREEscanRIP

10 years ago

Thank you for making this restart button. Could you rename it to 'Force stop'? ^^

GBleezy

10 years ago

Crashes my iPad version too. Weird, and to over a year old?

muk

10 years ago

It happening on my phone too...

Victor805

10 years ago

It's crashing my xperia every time I open it, weird...

refder

9 years ago

Same here. Crashes

physicsman

9 years ago

My LG optimus runns it ok. Put a 50 Ω resistor in series with led to limit the current spike. Ive built this circuit exactly the way it is here, it works in real life. About 3 hrs on a low battery, almost 8 on a full battery