This is a channel of a stereo amplifier and small power with the LM386 suggested by the Radio Electronics Experimenters in the 1981 edition. The power of a few Watts.
This circuit uses a General Electric coupler from the time of the publication in the 1980s....
Found in a 1980s documentation, this circuit makes use of components from that time. Modern...
Found in Linear Technology documentation from the 1980s, this circuit has an accuracy of 0.01%....