I want to make an external power supply for various pieces of "vintage" audio gear that run on +-18V, +48V, -9V and so on.
So the plan is to put several off-the-shelf AC/DC switchers (like Meanwell LPC-35-1050) into an external enclosure with some filtering. Then there would be a CPC connector with a length of multi-conductor cable to each piece of gear which would have 2-3 regulators to make the desired voltages.
But I'm not familiar with the noise characteristics of SMPS. The following circuit is my first attempt at a post-switcher filter / shutdown control. It consists a ballast cap, common mode choke LC filter and remote control power switch that doubles as a capacitance multiplier filter.
So the main question is whether or not the filter needs to get low frequencies. Currently this circuit assumes the switching noise will be in the 50 kHz + range. But is that really true? Can SMPS generate low-frequency noise?
More generally, does anyone see a problem with this design? Again this is for pro-audio gear using convential analog designs like for op amps and discrete "vintage" circuits so the supply needs to be very low noise.