Capacitive Relay (T1527E)

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

Dual temperature monitor (CB21377E)
This circuit was obtained from a 1967 GE SCR manual. It is intended for controlling relays...
Microchip EQCO62X20 6.25Gbps Asymmetric Coax Equalizer
Microchip's EQCO62X20 6.25Gbps Asymmetric Coax Equalizer is a driver/equalizer chipset that forms...
Synchronized Triac Control (CB25497E)
This circuit was found in the August 1992 issue of Radio Electronics magazine. The circuit can be...