In a recent episode of Doz' Television workshop, I diagnosed line output transformer (flyback) transformer failure in pye TV.
So, a means of repairing the transformer was required.First things first was to get the old transformer apart, which was a messy and long-winded job. I'll spare you the details here...
Then what was needed was a means of counting the number of turns on the existing transformer. I didn't fancy the job of doing this by hand, so a plan was hatched.
You'll need:
A length of 5mm diameter rod or bar. I started with a short (100mm) length of aluminium, but changed it to a longer length (250mm) of stainless later on.
Some 3D printed parts: These are available for download on my git for this project here.
Two "pizza slice" shaped parts (quadrants)
One spindle
a handle
and a sensor holder
Also needed are some slotted photo interruptors. I got these from amazon. You'll need two.
and finally a 16X2 I2C LCD display and an arduino or equivalent. I chose a Sparkfun pro-micro.
After assembling and fitting the 3D printed parts together, I found out that the PLA I'd printed the quadrants from passed infra-red, so I stuck some aluminium tape on the relevant areas to obscure the infra-red. I also moved the quadrants for they were 180 deg apart.
During the winding process, I made a spool-holder in a similar manner, using some of these couplers to clamp the wire, and a spring retrieved from the original PCB vice to keep some tension on the reel of wire.
You can see how it all went here :
