Capacitive Relay (T1527E)

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

Regenerative pulses for playback (CB7304S)
This circuit used in tape recorders was found in an Electronic Design. The components support...
LED Driver with the UAA180 IC (CB21892E)
We found this range of LEDs with the UAA180 in the 1976 Siemens Integrated Circuits manual. The...
Intercom (CB22488E)
This two-station intercom was found in documentation from 1966. R4 should be experimentally...