This audio amplifier circuit was found in Radio Electronics magazine from June 1966. The circuit is a commercial RCA type and is powered by mains power.
The integrated circuit used in this configuration for noise reduction on FM radios is not common...
This circuit was found in the April 1984 issue of Radio Electronics magazine. The integrated...
We found this circuit in a 1977 National Semiconductor Databook. The circuit can use other FETs...