6 V power supply with power zener (CB21531E)

This circuit provides 6.3V of output from a 9V input. The circuit was found in a Dutch publication from 1966.

Phase Modulator (CB7928E)
This circuit is from a 1968 Electronic Design. The components are from the era and the operating...
Piezoelectric transducer driver (CB8117E)
This circuit was found in an Electronic Design from the 90s. The integrated circuit is from that...
Timer Switch (CB16474E)
This circuit, from a 1988 documentation, activates a relay for a period and has a touch shutdown as...