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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Somewhere in 4HV, as I remember, are details from a German experimenter who had but 100t. on his secondary, and produced quite creditable sparks, to the surprise of many.
The term flyback transformer is perhaps a misnomer, since it is really more of a choke, a disruptive dV/dT device rather than the turns ratio affair of the true transformer.
It is not uncommon in GM counter designs to find the tube HT generated across a small single-winding choke, which is quite satisfactory when only a few tens of uA are required.
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
Clear packing tape worked for me. Two layers of tape between layers of winding. Something like 20 layers of winding with a spark output of about 2cm from a ZVS driver. Sealed the ends with hot glue and it holds up great.
Registered Member #51
Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
Back in ancient times, I did something like this. I had maybe 500 turns of 28AWG on a large and old core. I ran a ZVS driver from about 90v from a modified MOT (had two MOT primaries on it to provide isolation). Here is what I got:
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Nice flyback. I did 200 turns on min and used nothing but paper for insulation (oil dunked it) and it runs fine :) Just like pole pigs, I used paper soaked in mineral oil :D
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
@Conundrum I have a refrigerator compressor that I can use, but I don't plan to use this flyback that often so the risk to loose the insulation is small.
@cjk2 those sure are some monster sparks. Interesting ZVS primary winding, can you provide more details?
@Killa-X sounds like an easy way. Could you post a few pictures?
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Homemade Flyback secondary
