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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I am making an asynchronous rotary spark gap out of a dc motor. I need a variable power supply for 24 volts and at least 8 amps and peak startup current around 20 amps. Can you use mosfets and a potentiometer? I would like to stay away from oscillators so i can just solder the components directly together. It doesn't need to be regulated at all. I already have a transformer and bridge rectifier along with filter cap and if at all possible i would like to use a irfp460 mosfet.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Since regulation is not an issue the simplest would be to
Use a 1A@240Vac or 2A@110Vac variac feeding the primary of a mains transformer with bridge rectifier and capacitor on the secondary. Not clever but simple and rugged.
Any electronic control would need to be in a shielded enclosure if near the running TC.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Wow, a comment from Steve Ward. What an honor! Well the reason i don't want to use the 555 is because i don't really know how to etch and i am no good at just soldering circuit to a board. I am not going to use this motor for rotary spark gap because i think it is only 3000 rpm. I am going to make one out of an angle grinder. All i need is a chopping board.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Like any other suggestion on here, check Ebay, about 6months ago I was in need of similar power supply, I managed to get a 24v 7A fixed dc power supply for ~35$, then you could just use steves suggestion of a 555 and fet.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Ok, i have changed my mind AGAIN! I am using the rotary spark gap with dc motor. I just need to leard how to do this stuff with etching or mabey i will make my own way of doing it, which i think I will. I will use thin pieces of copper tape and just solder it. It will work..
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I need a variable 24 dc supply.
