There were no filtering capacitors for preamp. It works, but there are a lot of noises. First, there are squeaks for about 5 seconds on power on. Line-in works alright. Second, when on Bluetooth, there is constant hiss and I suspect EQ is set poorly. Will try to fix the capacitors and complete the feedback.
Added missing capacitors. Do not notice changes.Might be power issues.
Nice small board with wires. Easy to setup and perfect sound quality