Joule Thief

[Pirate88179]

Jim:

I have never seen a kodak transformer prior to your photos...nice job.  I do know that on the Fuji AA tranny, one post is there just for mounting onto the circuit board, it is not part of the circuit.  I doubt if this helps but, you never know.

Bill

[electricme]

Sorry I forgot the circuit on my last post, here it is.

I have drawn it as a circuit layout and as I see it making actual measurements

The Green dollops must be anti flash over material for the HV coils.

jim

[nievesoliveras]

@electricme

That is a job well done. I have been trying to do just what you did for a long time but my meter is broken.

Thanks!

Jesus

[electricme]

Bill:

Thanks, I'll check that out later on, but it's nice to know though.

I see from the circuit board, that there is a 431K ohm resistor between P2 and P3, I think this is to "tie" the electrical pulce earth to the coil that creates the magnetic field in the iron. That would alow the HV out to be fixed at one end and not let it "float" about nilly willy.

If I was to connect two transformers together to double the HV output I would have to parallel up P1 and P2 together, that would drive the magnetic field in both transformers in sync.
The output I probably might need to connect both P3 together (becomes a center tap) and then pins 5 to be seperated, but I'm not sure at this point in time.
Then that leaves both P4s to deel with, wonder what I do with those two?

Gotta do a bit more thinking yet on the secondaries, it's not as stright forward as I thought it was going to be.

jim

[electricme]

Jesus:

Hello, sorry to hear your multimeter is broken, I got a couple like that too and it's no fun at all.
Luckly for me I managed to put my main meter above flooding water level, the other two below didn't fair so good and are a write off. The blue meter I used in my shed (had 3 feet of water in it) to keep an eye on transformer temperatures, the yellow one just measured voltages, I had another rigged to measure current, don't know where that one got to, maybe washed away lol.

I'm glad that my work today measuring the Kodak transformers has been a help to you.

jim