ProtoDAC TDA1387 X8 project

[hifinet]

I know the recommended range for C1 and C2 is 4.7 to 10uF. I want to try better quality capacitors, smaller values are cheaper. Can I use 1uF or less? How will it affect the sound? I have 200mV/47k ohms at the input to the amp.

If your input impedence is 47k, you can go much lower. The C1 and C2 caps form a high pass filter with the input resistance. There is more info in post 429 . You can pick a corner frequency close to the desired cutoff (for example, 20 Hz), but undesirable phase shift is highest. With 1uF and 47k, the cutoff frequency is 3.386Hz and the phase shift at 20 Hz is 9.61 degrees. I have used 3.3uF with standard solid state 10k input impedence, and it sounds very good. I usually do this to get the size of the cap smaller (with the Jantzen Superior-Z, which is still quite large).

High pass filter calculator