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4hv.org :: Forums :: High Voltage
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How to tell if a flyback transformer is an AC or DC one?

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Inducktion
Fri Sept 16 2011, 08:54PM Print
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
I recently acquired a large flyback transformer, that looks like a DC one. But, it has a suction cup attachment, making me think it might be DC.

How do I check if it's an AC or DC flyback transformer? Thank you very much!
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ZakWolf
Fri Sept 16 2011, 10:23PM
ZakWolf Registered Member #3114 Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
try to charge a HV cap. If its AC it will arc to anything metal not touching the other lead.

-good luck
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Antonio
Sat Sept 17 2011, 01:46AM
Antonio Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
Test the secondary winding with a resistance meter. In a DC flyback the long diode string will cause a reading of open circuit.
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Forty
Sat Sept 17 2011, 03:37AM
Forty Registered Member #3888 Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
I hope the 6 "vintage" flyback transformers i just won on ebay are the AC type. Some bastard outbid me at the last second for my last try at 8 AC type. I hate ebay more and more each time i use it.
If it looks like an ac flyback (large area core, pancake coil, not a big block of epoxy) then it probably is an ac flyback or could easily be made into one. if the coil is taller than it is wide, then it probably isn't an AC one. But that's just judging from my knowledge of flyback style transformers, which spans a small time frame.
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haxor5354
Sat Sept 17 2011, 11:32PM
haxor5354 Registered Member #2063 Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
get 2 LEDs and wire them in anti-parallel (similar to parallel but anode to cathose and cathode to anode).
then power it up with a FBT
1 led on = DC
2 leds on = AC
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Microwatt
Sun Sept 18 2011, 01:23AM
Microwatt Registered Member #3282 Joined: Wed Oct 06 2010, 05:01PM
Location:
Posts: 224
get a neon bulb put it on both pins lit = ac one lit dc
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