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Old 15th Apr 2019, 10:37 am   #1
SteveCG
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Default Raycom Ltd Bench PSU CB524

Does anybody have a circuit diagram for this Bench/Lab type PSU? It is nominally a 0-15 Volt DC, upto 3 Amp, stabilised unit.

Recently got from a car boot sale, after tightening one of the output connectors and the panel mounted mains fuse I find it works, but only goes up to 12 Volts according to its meter. I checked the output voltage with my multi-meter and it was indeed 12 volts. I can see three preset pots inside the rather cramped unit. It has a printed circuit board that is mounted on the rear of the meter and so is not going to be easy to trace the circuit - hence my request.

Thanks.
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Old 15th Apr 2019, 1:07 pm   #2
Refugee
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Default Re: Raycom Ltd Bench PSU CB524

I had one with a loose output terminal and when I opened it up it was a can of worms.
The feedback line to the sense transistor took the full power. It was only a little transistor but the whole thing had to come apart to find and replace it.

https://www.vintage-radio.net/forum/...ad.php?t=89688
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Old 17th Apr 2019, 11:18 am   #3
SteveCG
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Default Re: Raycom Ltd Bench PSU CB524

I have some further information which might help.

Examining again the Power Supply Unit (PSU) in a strong light I realized that the Raycom Ltd label was stuck over another one. This label says Academy-CB. I reckon that Raycom sold this Academy-CB product model CB-524 under its own name. I found a photo on ebay in the completed listings which is identical to the one I have except for the Raycom sticker:

https://www.ebay.co.uk/itm/Academy-C...p2047675.l2557

If Raycom sold Citizens Band Radio ( CB ) equipment in the 1980s then this product would make sense as a PSU for people who used CB Radios at home - as distinct from the 12 Volt powered car usage.
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