Indicated for stereophonic sound applications, this circuit was found in the April 1983 issue of Radio Electronics magazine. The indicated circuit is the NE570, launched at the time.
Found in Popular Electronics from the 1980s, this circuit can use more modern transistors such as...
This circuit is from a Radio Electronics from February 1970. The integrated circuit is an...
This is stage is transformer coupled and was found in na old publication of the year 1958. The...