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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Well, you can parallel the two outputs for 10 amps at 50 volts, or series for 100 volts at 5 amps. But i must say, making your own would probably be much better. Just rewind a mot, and use a variac on the primary side for variable voltage. It is not regulated, but for something like a zvs driver, regulation is not needed. Neither do sstc's. Or anything like that that drives a transformer from a dc supply for that matter. Rewinding a mot is very easy and you can get the voltage that you need, and the are good for usually at least 800 watts continuous, and for something that doesn't run for too long, you could get much more.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Digital panel meters in PSU's are often very vulnerable to rogue high voltage pulses traveling back along the supply rail - so take care if you buy something like this. More than one member of this forum has fried their PSU digital display during HV experiments.
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
Another alternative is a big smoothing cap, a bridge rectifier, and a variac. It'l give you as much voltage with however much current you could want (within reason).
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
It depends on what you are trying to do... If you are trying to run SSTCs, the variac+bridge rectifier+smoothing cap will be cheaper/more robust. If you are using it as a general lab supply where you want something that is smooth, stable, etc, a dual 5a supply is great for running little logic circuit and the like,
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Yea you "could" make one, provided you had the heatsinks, transistors, transformer, and meters already purchased, but at this point its almost the same cost.
IF you are doing some experimenting like building amplifiers (I am playing with some right now) then the dual tracking is a really nice feature. Or if you are designing non-high voltage related things these are really good, but get one with V and I readouts so you don't have to switch back and forth.
Never use these things for Flyback stuff, or nice signal generators, I wiped out my BK 4017 doing that.
Other then that, having these as lab supplies, yea I think its worth it. I paid about that much for LG supply that retailed for over $400 a few years ago.
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
Strangely enough my made-in-China 30V 5A PSU has run a 2n3055 flyback driver, and even my SSTC without any issues... any ideas why my PSU isn't dead yet?
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
aonomus wrote ...
Strangely enough my made-in-China 30V 5A PSU has run a 2n3055 flyback driver, and even my SSTC without any issues... any ideas why my PSU isn't dead yet?
Same, I used mine driving an ignition coil once, it does have analog output meters tho.
If you don't have a lab PSU already, I would say definitely get it. Very handy to have around.
Registered Member #1749
Joined: Fri Oct 10 2008, 02:04AM
Location: Claremont New Hampshire
Posts: 497
OK I am going to buy it thanks for your Pro's and con's. High voltage is not the only thing I do the other day I made an audio amp and I used my rewound MOT but it did not work to good. And I repair car radios and other things for a little cash here and there so it might be a good idea to have a power supply so I don't have to use a 250w computer PSU all the time.
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0 to 50V 5A power supply.
