Joule Thief

[gadgetmall]

I have a graphic made at the start of this topic with different schematics the first one is the exact way the fugi circuit goes on the pcb but I dont know how the inside coils are configurated.

Dont worry we will try to understand it as well as possible

Everybody here does his own measurements with his own flash circuit.

On the graphics there is a schematic that explains the transformer.
The other tests and experiments are on your own.

Jesus

Hi Jesus Very Nice Schematics . I can Make a bit more sense of these I will mod one tomorrow for everyone with the correct instructions for getting the current WAY down . Also Mine has a different transistor than all of those listed it is a 2sd2504 . Might be the difference everyone is looking for .. thanks again . GNite .

[innovation_station]

all my cam trannys read d1960 n   .... 

i have some others that are diffrent but this is what i used for all cam trannyies


as it is what they came with ..

ist!

i could give you resistance readings on my trannys

well gonna build me a tesla cap fire primary and secondary 

sure i will post the brute...  i will make them equal mass ...  hell with counting the turns   

@ bill ...

think a steel ring with a slice in it will work  or just plain old air core .... ?

[gadgetmall]

no need to take it all apart. 
the resistance of the coils, wires size and transformer dimensions are all that is require.   

something like this can be use for wire size measurements
Electronic-Digital-Caliper

Yea ist don't take it apart all the measurements are on those schematics including the wire size and turns . COOL ..  . I was close ..PRI  6 turns #26    SEC 1750 turns # 45 and tapped another 15 turns #32 . dam im good.  Almost ..

[Mk1]

@ist gadgetmall

Young thief?

[Pirate88179]

@ All:

For what it is worth all of my Fuji Transitors are D1960's like IST's are.  The T-9A transformer is also on all of them.  Could we not just look up the specs on a T-9A online somewhere to see wire sizes and windings?  I am sure Fuji did not build this transformer but bought a boatload of them off someone's shelf that makes it as a standard item.

@ IST:

Thanks.  You are right, it may be the same a slicing my ferrite.  I guess I just like the challenge.

@ All:

For some reason (ignorance probably) I can not get a handle on measuring amps (mA's) on any of my circuits.  Yes, the books all say as many of you have said, measure amps in series, volts in parallel.  Fine, I get that.  What I don't get is how to do that?  Every time I attempt this, it does not show the draw of the circuit, it shows the amps available to be drawn upon in the battery.  No matter which circuit I use, or how many leds I am running, the measurement is the exact same as the battery alone.  So, obviously I am not doing it correctly.

To put the meter into the circuit like the books say, the circuit has to flow through the meter right?  So, I take the red probe of my meter and insert it into my breadboard just after where the battery plugs in on the + side, and then take my black probe and plug that to where the power jumper would normally go to the + side of my circuit and....it is the same as the battery.  I did it on the - side and got same results.  So, can someone please give me some simple instructions on how to do this properly?  I keep getting 1.2 amps no matter where/how I measure, and on both the Fuji and the toroid it is all the same.  Once I learn this then I can join in and see what mA's my circuits are pulling now.  I really appreciate the help, thank you in advance.

Bill