High impedance stage (CB20564E)

This high input impedance amplifier stage was found in a 1963 documentation. The transistor germanium of the time.

Lie detector (CB7005E)
This simple lie detector was found in Popular Electronics. Transistors are commonly used. The...
Voltage Follower (CB8991E)
Found in documentation from the 1980s, this circuit uses an operational amplifier from that time....
RF detector (CB17363E)
This circuit allows the detection of RF signals using the lowest range of direct currents of a...