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Old 6th March 2009, 09:16 AM   #1
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Default Bench PS: stacking DC supplies

So I got this transformer with 5 individual secondary windings: 120V, 120V, 105V, 105V and 1x 400V, all rated for 350mA

I want to make a bench power supply from it, feeding the primary from either a Variac or straight from the net. As there are individual windings I was thinking of rectifying and filtering them individually, obtaining 5 raw DC voltages that can be used individually, combined, or stacked for some serious high voltage.

For the 120V and the 105V windings I will use some 100uF/250VDC rated electrolytics, while for the 400V I would be using two 220uF/400V in series (with bleeders across them).

My question regards the feasibility of stacking the individual supplies: given the different voltages, can this become a problem? Morgan Jones (p354) shows how to stack two supplies, but in his case the voltages are similar.

Actually I do not think it will be a problem, but overconfidence is not always a good thing

Thanks! Erik
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Old 6th March 2009, 10:09 AM   #2
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No problem at all, at least when I've done it. Think of it this way- is it any different than using a negative rail of, say, -15V to power the CCS of a diff amp?
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Old 6th March 2009, 02:00 PM   #3
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Hi Stuart

Thanks for the reply and the analogy, it makes sense!

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