Capacitive Relay (T1527E)

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

CB4451E ()
Passaje Alarm This locking circuit was found in a 1988 publication. It locks a relay when the...
60 kHz ferrite antenna (CB6981E)
Found in a publication for radio amateurs from the 1980s, this circuit amplifies signals in the 60...
DC Servo Accelerometer (CB4921E)
We found this circuit in an application note from Linear Technology of the 90s. The circuit uses...