For upgrade: AMS1117-3,3 --> LP2985IM-3,3. Output noise voltage (RMS) from AMS1117 about 100 μV, output noise voltage (RMS) from LP2985 about 30 μV. Ceramic X7R, Y5V and tantalum capacitors are not good for the music. Only ceramic NP0 and film capacitors (Wima, Rifa, .....), but end price will be more high Your electronic circuit is good)) I am Sorry
发表于 2018-1-17 02:16:15
Your electronic circuit is good)) I am Sorry 