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Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
After trying 1 of Steve Wards mini coil drivers and testing it at 12v Dc and getting very small sparks, but being able to light a flourescent, neon and some other gas filled light just by having them near the toroid, I was trying to think of a way to put more voltage into the ciruit to try and get larger arcs. When I tryed to use the -12v and the +12v from my PC PSU it would ALWAYS trip the power on it, and besides thats only up to 24v I wanna see about 25v+.
SO onto the question, not that the fet power sections has to have perfect DC voltage, I was wondering if for an adjustable power supply if I could just use a set value resistor of a a couple of watts, and a say a light dimmer in series and just pull rectify the voltage across the Dimmer and use that to power the fet power section?
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
you could use a light dimmer, but there is a decent chance that it will explode... But it is certinly cheaper than a variac or real supply ;)
If you have a dimmer laying arround and aren't worried about blowing it up (defiinantly put a fuse in series with it, sometimes they put out full voltage when they fail), just hook a bridge rectifier up to it and feed that into a nice big filter cap. You might even get away without the filter cap, but your coil probably wouldn't like the waveform that a dimmer puts out (clipped sine wave), and I would imagine that the sparks would sound pretty nasty.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
''normal'' light dimmer will not work well with a filter cap.
You need to use a pulse-train retriggered dimmer either of steve conner's or ST design.
ST has been pretty much tested out even on arc welders and it will work with all 'troublesome' loads. Page 10.
With filter cap, power factor will be poor so you may want a few-hundred uH PFC choke series with input, and a low pass filter to block out chopping harmonics.
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0-~120v Adjustable PS.
