Joule Thief

[gnino]

http://www.youtube.com/watch?v=GJEzH8-mPsc

Correct value except Inductance
The Big capacitor is not doing work i leave in the Schematic with the diode for trasparence

Ciao Luca

[gnino]

Tinselkoala if you want ,can you try this with your tesla pancake bifilar coil?
Drive the transistor with pwm
I think you handle mosfet better than me
So edit the Circuit as you like

Ciao Luca

[TinselKoala]

Now that's interesting.

When I do this, I get a dim, but visible, glow in the first ("dark") bulb and a bright glow in the second one. My bulbs have two filaments, a lower and a higher resistance. The behaviour of the circuit strongly depends on which filaments I use.

You are right about one thing: if the 4700 uF cap isn't in the circuit, it can't be powering it!

I'm scoping the circuit in various places and I see some interesting things. I'll post some pictures later on this evening; right now we are dealing with goblins and spooks, witches and skeletons all demanding candy.

I'll try a different transistor too. I don't have the one you are using but I do have some HV transistors from old TVs, like 2sd2539 or 2sd870 that I can try.

[gnino]

Whit 12 volt battery same Schematic last video
http://www.youtube.com/watch?v=bfd_laZuPlc

[Pirate88179]

Whit 12 volt battery same Schematic last video
http://www.youtube.com/watch?v=bfd_laZuPlc

Thank you for your reply to my question about components,etc.  This might be very interesting.

Thanks,

Bill