Relative impedance meter (CB7487E)

Found in a 1960 Sylvania manual, this circuit can be implemented with a modern equivalent transistor like the BC558.

LED blinker (CB11822E)
This circuit causes an LED to flash at intervals determined by C1 and R2 and for a duration given...
CMOS voltage tripler (CB9446E)
Found in a 90's EDN, this circuit provides a current of a few tens of mA. The circuit can generate 15...
Automatic start for LASER (CB7226E)
This circuit, of a Popular Electronics of 1969 is destined to firing a gas LASER of the time. The...