Found in an Electronics Now from the 90s this mixer has several inputs. The integrated circuit can still be found easy and the power supply need not be symmetrical.
Suggested by General Electric in 1965 documentation, this flasher has a control circuit with a...
Found in an Elektor from the 90s, this TTL circuit can be used as a shield without any bouncing...
This circuit was obtained from Dutch documentation from 1967. It uses transistors of the time...