First, I am not the expert to answer your specific questions.
Some things that I have discovered. DC/DC converters are very noisy. Pre-DC/DC converter RFI filtering is an absolute necessity. Use SMPS filters and LDO linear regulators after DC/DC converters and before ProtoDAC, if you plan to power ProtoDAC that way. Allo used more than 30 LDOs and zero switching elements on board in their excellent USBridge Sig !! I am considering a LifePO4 battery supply for ProtoDAC. The quality of the ProtoDAC power supply is extremely important for sound quality. The PurePi 5V ultracap supply needs a snubber (2R7 and 1uF film or even larger) before supplying ProtoDAC. The noise to be concerned with is conducted noise in power and data connections (I2S). EMI/RFI to ProtoDAC is less of a concern.
Some things that I have discovered. DC/DC converters are very noisy. Pre-DC/DC converter RFI filtering is an absolute necessity. Use SMPS filters and LDO linear regulators after DC/DC converters and before ProtoDAC, if you plan to power ProtoDAC that way. Allo used more than 30 LDOs and zero switching elements on board in their excellent USBridge Sig !! I am considering a LifePO4 battery supply for ProtoDAC. The quality of the ProtoDAC power supply is extremely important for sound quality. The PurePi 5V ultracap supply needs a snubber (2R7 and 1uF film or even larger) before supplying ProtoDAC. The noise to be concerned with is conducted noise in power and data connections (I2S). EMI/RFI to ProtoDAC is less of a concern.
Hardware: RPi Zero W | Allo Kali | ProtoDAC TDA1387 X8 | PGA2311 | Icepower 500ASP | Harbeth SHL5
Software: Moode 8.3.3
Source: Win 10 NAS
Software: Moode 8.3.3
Source: Win 10 NAS
