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Old 12-27-2014, 07:27 PM #1
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Default MOT stepdown using HV coil as primary

I've found lots of links about cutting out the HV coil from a MOT and using it as a low-voltage supply, but not much about driving the HV coil and using the LV coil for moderate current.

It's OK to wire the HV coil as primary using 120/240 volts in, right? I figure if the HV winding can tolerate kilovolts, it should be able to tolerate 120/240. The high turns/volt in the HV coil should mean that core saturation isn't an issue.

Presumably one could cut out the LV coil and replace it with a few turns of heavy cable and get even more amps. The only issues should be wiring it properly and limiting/ballasting the mains input to something sensible e.g. 2 amps.

Am I close, or way off? Rather ask and look dumb than get electrocuted and look even dumber.


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Old 12-28-2014, 12:02 AM #2
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Default Re: MOT stepdown using HV coil as primary

Yeah, that'll work, but why? That'll get you like 7V out of the other end, and maybe 15A before the wire starts melting. You can get 7V at a hundred amps if you rewire it like everyone else does.
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Old 12-29-2014, 06:32 AM #3
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Default Re: MOT stepdown using HV coil as primary

I don't need 100A out of it. I just don't feel like hooking it up for 2kV out, because after I get bored drawing arcs with it I don't know what else to do with it, other than accidentally frying myself. Pass on that.

I would probably be better off getting a battery charger transformer, or some sort of power/welder transformer instead; apparently MOT are so bad with core saturation that even idle current is enough to overheat them.
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808nm : SkyLaser HL808 820mW
650nm : [C6] LPC-826 215mW - SkyLaser HL650 175mW - Radio Shack <5mW
638nm : Opnext HL63603TG 190mW - AtlasNova <5mW
632nm : Metrologic ML-868 <5mW - Uniphase 155ASL-1 HeNe 0.95mW
543nm : Melles-Griot 05-LGR-193-497 HeNe 2.4mW
532nm : SkyLaser HL532 w/ IR filter 200mW - Fasttech SD-301 120mW - Lazerer LZCS 105mW - Laser 301 custom mod 85mW - various Laser 301's
520nm : [C6] Osram PL520 110mW - SkyLaser HL520 50mW
450nm : [C6] Osram PL450 260mW - Lazerer LZCS 145mW - SkyLaser HL450 95mW - SkyLaser LP450 90mW
405nm : Laser 303 85mW - Laser 301 90mW

Radiant X4 LPM from Illumination Supply


CHEAP BATTERIES CAN KILL YOU - please read this thread to see the truth about UltraFire and other CRAP brands!
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