Broadband Balanced Mixer MC1556G (CB14563E)

We found this circuit in Motorola's Linear Databook in 1990. The integrated circuit used is no longer common today.

Capacitive relay (CB23700E)
We found this circuit in a Radio Electronics from October 1960. The circuit uses just one...
Sampling and holding (CB9188E)
Using components from the era, this 90's EDN circuit is used in analog to digital conversion...
Tape recorder oscillator (CB8289E)
Found in National Semiconductor documentation from the 1980s, this oscillator is used for...