This circuit was found in a Japanese publication in 1975. It provides 30 W per channel using the SI-1030G modules. The module must be mounted on an excellent heat sink.
Using an operational amplifier, the figure shows how to convert the waveform to low frequency...
This high quality circuit with complementary symmetry was found in an Electronics World of 1966....
This circuit was obtained in an old 1983 magazine, but it can still be easily assembled. The...