The circuit is from the 1977 National Semiconductor Audio Handbook. The bass and treble control is Baxandall type. The integrated circuit used is not common today.
This circuit was suggested by Radio Electronics magazine in September 1983 in the new ideas...
We found this amplifier with high input impedance and low capacitance, using FET, in a...
This powerful pushbutton uses a power MOSFET. We found it in a Popular Electronics magazine from...