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Registered Member #10052
Joined: Thu Feb 07 2013, 11:31PM
Location: Overland Park, Kansas
Posts: 78
Current limiting is necessary with an MOT.
You can use either a resistive or inductive ballast.
For a resistive ballast, its: (line voltage)/(desired current)=(ballast resistance). Then poke around your hardware store for a hot water heater of that resistance, stick it in a bucket of water, and you're ready to go.
This will however burn off tons of power thats doing nothing usefull.
Many use an inductive ballast to increase the impedance of the transformer's primary circuit. It is common to use another MOT as an inductor to do this. Some short the secondary, some remove it alltogether, but the idea is to run the primary in series as an inductor.
Registered Member #31557
Joined: Tue Aug 06 2013, 02:38AM
Location:
Posts: 58
HighVoltageFeathers wrote ...
Current limiting is necessary with an MOT.
You can use either a resistive or inductive ballast.
For a resistive ballast, its: (line voltage)/(desired current)=(ballast resistance). Then poke around your hardware store for a hot water heater of that resistance, stick it in a bucket of water, and you're ready to go.
This will however burn off tons of power thats doing nothing usefull.
Many use an inductive ballast to increase the impedance of the transformer's primary circuit. It is common to use another MOT as an inductor to do this. Some short the secondary, some remove it alltogether, but the idea is to run the primary in series as an inductor.
I beg to differ. A well tuned MOT powered SGTC does not require ballast. MOT's do have shunts in them to limit current when shorted, albeit not for an extended time. I'm running dual MOT's unballasted, no tripler, no filter. The transformers only get warm to the touch after several minutes of run time:
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