This circuit rejects frequencies around 1 kHz and can be adjusted using C1. Equivalent operational amplifiers can be used, and the power supply must be symmetrical.
This is the typical audio amplifier for a 1967 television. We found it in a magazine from the...
We found this circuit in the May 1983 issue of Radio Electronics magazine. The integrated circuits are...
Found in General Electric's documentation from 1970, this circuit is indicated for the so-called...