Tunnel diode simple noise generator (CB23705E)

This circuit was found in Radio Electronics magazine from November 1960. The circuit is powered by a photocell of the time.

30 and 50 V power supply (CB8678E)
This source was originally suggested by Delco in a 1969 documentation to power amplifiers up to 50 W. The...
Intercom for noisy environments (CB21069E)
Found in a Popular Electronics from the 90s, this circuit is suitable for communication between rider...
Analog switch (CB21264E)
Found in an Analog Devices documentation from the 1990s, this circuit uses components that admit...