Joule Thief

[innovation_station]

yep i like those 4401's 

work well for me

i dug out this meter i bought a long time ago ... i have not used it much but it think it is time...  it has a COMP INTERFACE ...   does freq  and all that stuff



so i will fire it up after i compleat the source jt ..

ist

[hazens1]

Ok, so I made a Mk2 toroid

4 turn Main, 4 turn Trigger, 4x22 turn secondaries

I have a n4401 NPN transistor, 2.2k resistor, 1 inch Mk2 Toroid and a 10uf 35v cap.

I have 3x10mm leds 28,500mcd 4.0v on 3 of the secondaries and I have the 3 led push light circuit on the 4th secondary.

Total draw 44.2ma

Leds work both ways, but if more than 1 secondary used, they must all be same polarity or they all shut off.

Amp draw goes from ~40ma to ~44ma up ~1ma for each secondary used. I.E. ~42ma when 2 secondaries are used.

I noticed the pulse frequency goes down, pulse width goes up and pulse duty goes up as I load each of the secondaries up.

I'm going to add a trimmer pot and try different caps and transistors to see what happens with the data.

[Pirate88179]

@ Slayer:

Great video! (5 stars)  I think you found a way to synchronize the 2 JTs.  Great work!

Bill

[electricme]

@Ist,
Nice setup of your battery charging photo, glad you have been able to make it work, and fast at that.

@jadaro2600,
I think you mare seeing the effect of inrush current, electrons pile up when you switch on a circuit, then they even out and flow through better.

What did you use to draw your circuit? where can I get it from?

General jim

[electricme]

@all,
Today I decided to make up a light chaser kitt  now what can I do with this thing?
Mabe solder a 330ohm resistor to the hi output of the LEDs and send the + to the base of a BC548 to allow the output of a JT to charge up a bank of electrolytics? then discharge them all into a battery? hmmmmm, I'll do a bit more reading up on this one.