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Registered Member #1731
Joined: Thu Oct 02 2008, 02:22PM
Location: Indiana
Posts: 52
I recently put together a successful driver for a TV flyback. The transformer had the simple horseshoe shaped array of pins and after some googling I was able to ascertain the pinout.
Tonight I extracted a higher rated flyback from a 19" monitor and noticed that it had 3 pins arranged in a vertical line, in addition to the standard horseshoe array.
I believe these are connections to the voltage tripler that is attached to the side of the winding - do I need to do anything with these 3 pins, or can they be left unconnected?
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Modern flyback transformers do not contain triplers, or at least like 90% of the time, i think. It seems like the only flybacks i can find with capacitors are from monitors.
Those pins are usually from the internal potentiometers and a ground pin, at least this seems to be the case with mine. But, since i usually run at 100 times the average power, resistors become capacitors and transistors become mosfets and other phenomena i cannot explain.
In short, pun slightly intended, you do not need to use these, unless you'd like to use the ground pin, if applicable to your situation.
Registered Member #2614
Joined: Sat Jan 09 2010, 08:57AM
Location: Bucharest, Romania
Posts: 26
Steve Hobley wrote ... do I need to do anything with these 3 pins, or can they be left unconnected?
Yes, you need to insulate them. They come from the focus and G2 voltage (screen) control pots. They have a habit of becoming capacitors so if you accidentally touch them after you finished playing with the flyback (and believe it's fully discharged), they will zap you quite good.
Registered Member #1731
Joined: Thu Oct 02 2008, 02:22PM
Location: Indiana
Posts: 52
Great - thanks for the info - I always assumed that "lump" attached to the side was some kind of tripler, as the primary/secondary windings are physically smaller than my 19Kv flyback.
The flyback is labelled "Tatung TFB-280T" but I've not been able to come up with a schematic for it.
Registered Member #1565
Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
I would say isolate or ground them, even you could possible use them to check the AC component(internal capacitors) or voltage(huge resistor toward the HV) on the output.
The question is how far do you plan to take it?
Note 1: I can see you possibly have a capacitor at the "end" of the transformer (the bump next to the knobs) Ground it for sparks, isolate it for arcs.
Note 2: The primary is the 2 pins in the horseshoe facing away from the row of 3 pins in a row, if you want to experiment with a 100V+ driver.
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...and yet another flyback question
