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Forums
4hv.org :: Forums :: Sale and Trade
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Modern AC Flyback Transformers

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Dragon64
Tue Jan 22 2019, 07:23AM Print
Dragon64 Registered Member #1438 Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218
I know it's been awhile but is there anyone still selling this potted AC flyback or anything equivalent to it? Link2

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Proud Mary
Thu Jan 24 2019, 12:47AM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Hi Dragonfly, this and other Chinese ebay sellers are offering an AC flyback complete with driver electronics all ready to go and cheaper than you could make it yourself. Link2

I bought a similar but more powerful flyback with driver assembly from China and was not disappointed, tho' I guess it would conk out if I kept drawing arcs from it.
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Dragon64
Fri Jan 25 2019, 04:21AM
Dragon64 Registered Member #1438 Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218
Hi Mary, thanks for the quick reply.

I have looked at those Chinese flybacks but it seemed like they were DST flybacks with pulsed DC output.

Are there are major downsides of running a CW multiplier using pulsed DC versus AC? I wanted to resurrect my old multiplier without having the use my messy oil soaked pancake flyback transformer.

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Conundrum
Sat Jan 26 2019, 03:26PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
I believe the fix may be to drive a resistive divider.
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Proud Mary
Sat Feb 02 2019, 08:21PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
It's a long time since I last saw a 1950s style 'AC flyback' for sale on ebay. 99 out of a 100 are diode split types.

How about using a gas boiler type HV transformer, like the one for sale here: Link2



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Conundrum
Sun Feb 03 2019, 06:35AM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Yes this works.
Watch out though, HVAC @ 50 Hz is even more dangerous than regular HV.
I managed to modify mine so that it works continuously but this is a bad idea unless you keep everything very well insulated, cooled and use the "one Hand rule" with an ELCB or GFCI so if there is any leakage it shuts down. Ideally also a "Run" button.

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