Capacitive Relay (T1527E)

Found in Popular Electronics from August 1956 this sensitive two-tube relay is powered directly from the mains power supply.

-15 V regulator (CB13197E)
The integrated circuit used in this regulator is not easy to obtain, since the publication is from...
Precision Voltage Reference (CB16040E)
The presented circuit serves as a voltage reference for instrument adjustment. The diode used as a...
Divider by 2.5 (CB12441E)
This circuit is from a 1991 publication. It divides the frequency of a TTL signal applied to its...