Metal Detector (CB21929E)

This two-transistor metal finder was found in a Raytheon manual from the 1950s. The transistors are germanium from the time.

Voltage Controlled Oscillator (CB4168E)
This VCO with a common operational amplifier was found in an old American documentation. The...
Car Alarm Simulator (CB18821E)
It is a simple blinker that simulates the action of an alarm when installed on the dashboard of a...
Sensitive electronic relay (CB23762E)
We found this circuit in Radio Electronics magazine from October 1966. The circuit uses a 15 V...