Joule Thief

[electricme]

Bill:
I tried googleing for the trannie using part numbers, never mind, something will come up.
Thanks Pardon for posting that circuit, in the morning I will attempt it and see what happens.

jim

[nievesoliveras]

I think that the best way to know the inner wiring of the transformers is to disassemble one and take notes of the windings configuration and direction of winding.

Jesus

[electricme]

I'm in the middle of a transformer pulldown.

Kodak Disposable Camera, so far these are the results, MORE to come.

Print out one of the above jpgs which shows you the pin out I have designated.

P1     P2      P3

P5              P4



***************
Top Layer Turns
Primary winding consists of 6 turns of unknown wire size,
Wire begins on P2 and Ends on P1

***************
Next Layer Turns
Secondary 1 consists of 12 turns of smaller gauge wire
Wire begins at P3 and Ends on P5

This is the mystery coil I picked up using my multimeter, the coil exists.

***************
Secondary2
Surprise surprise, this secondary is Bifilar wound with very fine wire
The last of the winds are on P4 which is the centertap
One Bifilar wire goes to P5
One Bifilar wire goes to P3

***************

The turns of the 2nd secondary.

I began the pulldown (unwind of the 2nd secondary coil) when after the 3rd turn, one fine wire broke, this still left another strand, then it broke.
This left me no alternative than to unwind all turns (impossible to count from this tangle) until the last layer where the last few turns could be seen connecting to their respective pins,.

What caused this last part of the pulldown to go astray? it was the green glue or substance that was used during manufacture, a dollop of green gunk was applied just before the beginning of the 1st turn when the coils were being made, as this gunk solidified, it also encapsulated the fine wires, which were impossible to pull out of the hardened gunk.
The outcome was everytime I reached the green gunk, the wires broke.

I tried to remove this green gunk but found it impossible as it had hardened to a hard glaze.
***************

Results are.
Secondary High Voltage coils are wound with many turns in a bifilar fashion as they go on the former, they are not wound side by side like we do with the Stubblefield Coil.

The start of the winds are connected to P5 and P3 and terminate together on P4

Layer of Blue Insulation tape is next

The Start of the next coil starts on P3 and ends on P5
This is seen as a separate coil with 12 turns on it, but it IS connected across the HV secondary coil, as I suspected, as was the case a couple of days ago.
This must be some type of automatic control coil as it truly is hard wired across Pins 3 and 5 which share the output of the HV secondary.
Maybe a transformer fellow can add further information to this peculiar arrangement.


Lastly there is the TOP coil it has 6 turns on it.



I have no way of measuring the wire sizes, sorry about that, my micrometer is somewhere in my container (at least I hope so)

jim

Photos of the unwind will follow below.

[electricme]

@ All,

Here are the photos I took of the Kodak Transformer coil pulldown.
Enjoy.
jim

[electricme]

The above photos were of the Primary Coil
Had to remove the clear tape holding the transformer halves together
BlueOSRape after the transformer halves were seperated, this is what I had
Showing the Primary Coil as seen on the transformer
The size of the wire , I layed the wire across a 32nd segmented ruler to give some idea of the wires width, best I could do at the moment.



Below Photos are

Sec1 After primary was removed I got to the 1st secondary, which I believe is some type of control coil.
There are 12 turns on this coil.