#KA72 amplifier – the charger part of the PSU works. The next step is USB/battery switcher, then DC/DC converter. However, the right side of the PCB may be left unpopulated, as I consider to use a dual converter and symmetric power supply for all the blocks.

Once upon a time I have created KA71, a headphone amplifier for Amiga with adjustable channel mixing. Now I have a plan to create its successor #KA72, fixing flaws and adding new features. I have started from the power supply block. USB micro-B power socket has been replaced with standard C one. 3 NiMH AAA cells are replaced with one 18650 Li-ion. Integrated charging circuit has been added. I had to change the chip driving DC/DC converter. Prototype PCB for the block has been ordered today.