Metal detector receiver (CB22457E)

Found at Popular Electronics this receiver is used with a transmitter for quadrature-coil signals.

Voltage Doubler (CB20196E)
In the figure we have three voltage doubler configurations that can be used in high and low...
Low Power AC Shield (CB18265E)
In this application, from English documentation, we have the way to activate an AC load up to 10 W...
Reflex receiver (CB20557E)
This 1-transistor reflex receiver was found in a 1963 publication. The coil is for the mid wave...