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Registered Member #60260
Joined: Fri May 27 2016, 06:35PM
Location:
Posts: 14
Hi all,
Two flybacks I salvaged from CRT TV's have windings besides the main one. It is impossible to remove those other windings without completely destroying the plastic encapsulation. If I don't want to use those other windings, should I leave them open, short them out or put a HV resistor on them and let them be?
I'm leaning towards shorting them out, but I would appreciate your more experienced opinions. Thanks!
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
just insulate them. if you short them, theyll just get hot and there wont be power anywhere else. i dont know what you mean by remove them. is it the cylinder type or the disc type?
Registered Member #1565
Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
Connect them together using only ONE pin from each winding group/set. It would take some multimeter-use to find the groups/sets. Also connect to HV negative.
That would give it all locked down potentials! No HV floating pins.
If it doesn't need extra isolation in the TV, you shouldn't need to have extra isolation on them too.
Registered Member #1565
Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
Just one thing:
You may have 1 or 2 capacitors (worst case: 3) or high voltage resistors going to their own pins.
You can ground capacitor pins (sparking outing) or isolate them(arcing output). The isolation should withstand the full output voltage and will be tricky to do.
The resistors should be grounded, but you may want to insert a series resistor for voltage measurements! (self-discharging output can be quite good to have)
The pins can be somewhat hard to identify, using a multimeter. If you do high voltage, resistor pins likely hiss with corona, while capacitor pins spark some few sparks on start/stop.
Your transformer may have all of the listed features, or none, or a subset. There is NO standard TV flyback, they are all different! Computer monitor transformers often have capacitor, TV ones usually don't.
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What to do with unused LOPT windings?
