This circuit serves as an audio output for AM or even FM radios and was found in a Radio Electronics magazine from March 1990. Note the supply voltages.
This 1975 documentation circuit must use a 6 to 9 V symmetrical source and the signal cables must...
With the circuit shown in the figure it is possible to digitally control the gain of an...
The audio amplifier integrated circuit used in this 1990 project is not very common today....