ProtoDAC TDA1387 X8 project

[hifinet]

I have a bunch of Icepower 200AC modules (200W mono into 4 Ohms) that I plan to sell inexpensively. I am working out a good way to power them before selling them. The 200AC sound excellent (and they are tiny, 1mm wider than a HAT and 107mm long; and no heat) , but the problem has been dealing with the switching noise from the supplies. I am using a 2000W industrial PFC 48V SMPS (95% efficient) used in cell towers. Cheap, high capacity and it is CAN BUS programmable, so that was interesting and fun.

The 200AC also needs +12V and -12V for the front end. Started with a cheap DC-DC converter without RF filter. Bad. Too noisy. Much better with a Pre-RF filter. It still needs more noise reduction. Adding LDOs. The nice thing about SMPS is compact/light weight. I think it can work with adequate SMPS filtering. 

theslowdiyer built one with a linear power supply.