This circuit was found in a 1964 documentation. It shows how to achieve automatic gain control for an oscillator. The transistors are of the time and the circuit controls signals from 2.6 to 3.1 kHz.
This circuit was found in an old TTL circuit manual. The circuit must be powered by 5V, and the...
This amplifier for biological research was found in an Electronic Design from 1964. The...
Found in National Semiconductor publication from the 1980s. This gain-100 circuit can be...