The idea of this circuit found in a Radio Electronics from January 1966. The idea of the circuit is to improve the reception of audio signals, mainly telegraphy, working as a filter.
This well-known circuit is another version of a 2-transistor transmitter found on the Internet. In this...
This traditional amplifier configuration is from the National Semiconductor's Linear Applications Handbook...
We found this circuit in a 70s Electronic Design documentation. The circuit uses general-purpose...