SPMSU for heater supplies

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SPMSU for heater supplies

Postby ruffrecords » Sat Jul 11, 2009 12:18 pm

I am building an audio mixer that uses 9 pairs of tubes and the heaters take 12V at a total of 5.4 amps dc. I don't fancy building a single 6amp 12V linear regulator so as I see it I have a couple of choices.

1. Build nine separate 1 amp or 5 separate 2 amp regulators - a bit cumbersome but workable.

2. Use an off the shelf 12V SMPSU. I have looked at a few examples. Most seem to switch at around 25KHz and at rated current have about 200mV pp ripple on the output (content unspecified but I bet there's some 25KHz in there).

As a low cost, small size way of achieving what I want an SMPSU seems the way to go but this 25KHz power circuit worries me. OK, the PSU will be in a separate screened box some way from the mixer's sensitive circuits but still am am a little concerned.

Anyone have any experience of using SMPSUs for heater supplies in low level audio or any other comments or ideas??


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