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Registered Member #1460
Joined: Thu May 01 2008, 12:45AM
Location:
Posts: 19
Hi,
I gutted an electronic neon power supply and took out the output transformer. It had a continuous ferrite core, a primary wound out of magnet wire, and a potted secondary with high and low voltage windings coming out of the potting. I believe it was an Evertron brand model 2610D.
I hooked up a frequency generator to the transformer. At about 30kHz I got a resonant mode, and a few volts on the input (10vpk-pk sine wave) was stepped up to 10kV (no arc / load).
If I went away from 30kHz, the output dropped substantially. 25kHz and 35kHz would give <1kV out.
What type of transformer is this? Is this how a LOPT functions given a sine wave input? I would like to find a transformer like this but with higher voltage and current capabilities. Thanks for any help!
Registered Member #396
Joined: Wed Apr 19 2006, 12:55AM
Location: Pittsburgh, PA
Posts: 176
Don't know what type of transformer it is but did you manage to gut one? Yours must have been different - the one I have is encased in some solvent resistant rock-hard epoxy which would be nearly impossible to remove without destroying the components.
Registered Member #1127
Joined: Mon Nov 19 2007, 12:08AM
Location:
Posts: 139
Inside these high frequency driven transformers is a MOSFET driver and several adjustable resistors --- at least mine did. By simply adjusting the power resistor I was able to go from 10 kV to 30 kV... the current was 1.5 X normal as well. I still have the transformer... works nicely. Be careful not to make the adjustment to wild or the MOSFET will blow
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I always wondered how comes that these HF transformers do not come into resonance with output capacitance (parallel running wires) and self-destruct. I know how attaching just a piece of Al-foil to the output of a flyback changes its resonant frequency. Maybe they run above their resonant frequency so no destructive resonance can happen by adding C on output?
I also wonder if there is a warning for not putting the output wires too close because 15kV HF corona will eventually "eat" through just any insulation under 1cm thick.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
They don't self-destruct or eat through their wiring because the tube limits the output voltage. The one I dismantled had some kind of protection circuit that made it go into hiccup mode with the tube removed, but the "hiccups" were still quite impressive, I seem to remember it would spark a good inch or two.
So yes, I think they actually use self-resonance to get enough voltage to light the tube.
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Electronic Neon Power Supply Transformer
