Schematic with an assembly drawing is in PDF attached.
BOM for non-inverting config with bootstrap and gain for ~3 is in .csv attached.
Link for the PCB ordering is here. Potentially can provide gerbers is someone asks personally. Crocodile #2 headamp- Share Project - PCBWay
Some prototype measurement results:
Common mode signal induced distortions (copied from above):
Spectra show how distortion grows vs source impedance. There are spectra for 1kHz, 10kHz and 19kHz+20kHz sine.Each one has three plots, Balanced source (around 330 ohms) for the red...
I built this design several years ago, made THD measurements:
I ordered the PCBs a couple of months ago, but only now came round to start soldering. My first 0603 project, not easy at the beginning, but I've got it under control now.
The PSU worked at once, no visible switching artifacts on the rails; with the components from the BOM, the voltage is 10.3 Volts.
Having soldered one channel, I listened a little with the headphones. Without the input signal, the amp is dead quiet.
Time for measurements: I don't have a commercial distortion analyzer - my DIY system consists of Victor's 1kHz...
