there is a class-d amp, with SMD chip driving the whole circuit, impossible to identify
A full bridge SMPS, with PFC at output of the SMPS with too many bulk capacitors
Without any bulk capacitor at the input of the SMPS, I like some ideas in the SMPS design, but its not the ultimate solution.
Its just a new idea, for a small amplifier, but I think it sound just OK, not perfect
Regards