EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: ArthurDent on August 29, 2019, 04:22:09 pm
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I've had this power supply for several years now and it has come in handy a few times. I had bid some very small amount for this on eBay and no one else bid so I got it. It basically is a specialized power amp driven by a variable frequency oscillator. The output is adjustable from almost zero to either 120 or 240 VAC at 200 watts. The output connections are either a USA style grounded plug or 5-way binding posts. It is handy if you want to test at 50/60 Hz or avionics 400 Hz equipment.
The supply was made by Toyko Seiden and is their CVFT1-200H model. Apparently they still make a similar small bench supply like this and they occasionally show up for sale for lots of money. It is handy if you want to test small equipment that is from the other side of the pond from where you live. It is very well made as you can see from the photos and uses a liquid filled heat pipe and heatsink with a fan to remove the heat from the output transistors that are mounted on the main circuit board.
I'm not sure how many TEA members might have run across this in their travels but thought it might be of some passing interest.
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That's a neat one. Never seen that particular brand or model.
Anyway, sometimes it comes handy - a Variac on Steroids ;)
Forum user D Straney posted a teardown of a more popular Chroma unit:
https://www.eevblog.com/forum/reviews/a-tale-of-two-ac-sources-part-1-(chroma-6408-teardown)/msg2335302/#msg2335302 (https://www.eevblog.com/forum/reviews/a-tale-of-two-ac-sources-part-1-(chroma-6408-teardown)/msg2335302/#msg2335302)
and I've got this one:
http://wunderkis.de/AC-Source-EAC/ (http://wunderkis.de/AC-Source-EAC/)
had to put some effort into it to make it work.
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Interesting heatsink with a really fat heatpipe.