This circuit for communications receivers was found in the January 1974 issue of Radio Electronics magazine. The transistors are Japanese types of the time, as the circuit was part of equipment of that origin.
This circuit was obtained in the Linear Applications Handbook of the National Semiconductor of...
This circuit is indicated for audio tests, the tracks being selected by the capacitors. The...
This circuit can be implemented with more modern operational amplifiers like the 741 and its...