The is a V1 FDA-1 PCM1794A DAC board. I have implemented a headphone buffer on to it and the result is super! Details is on the photos.
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Features of the buffer:
- K170/J74 x 6 pairs is used for each channel. Idss of matched pairs is at about 6.5mA.
- DC supply at +/-20V DC and thus ok to drive high impedance headphones.
- Bias of each channel is about 40mA after warm up.
- Gain of buffer is x1. The loudness is high enough for most headphones.
- A 100k(A) volume is used for gain reduction at the buffer input.
- Only SE DAC is used but the sound is transparent and full of details.
