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In Reply to: RE: SMPS negative supply posted by vetmedrobert@gmail.com on January 24, 2017 at 09:22:28
Yes, so long as the negative terminal is isolated (meaning it is not tied to earth or ground.)
Follow Ups:
Not sure what you mean. I would ground the positive side of the supply and the negative would be connected via a voltage divider to the grid of the output tube via a winding in the interstage transformer.
I think they all have floating outputs, but an ohmmeter from Neg to chassis will confirm it. A bigger problem is the noise. I wouldn't do this without a rigorous filter network at the output.
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Buy Chinese. Bury freedom.
I've looked at noise data for these supplies and it seems pretty low, especially compared to negative supplies using one diode...
Most switching supplies output a lot of garbage, and it appears on both the input and output(s). Manufacturer specs can't be trusted in this regard. You need to make the measurement yourself. As for relative noise, standard single-diode bias supplies are usually very clean due to the ease of filtering 60 Hz at such an extremely small current draw. Using two diodes (or a bridge) can reduce it even further, but that's seldom necessary.
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Buy Chinese. Bury freedom.
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