High impedance stage (CB20564E)

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

Tuned Shortwave Antenna (CB25749E)
This shortwave preselector was found in the July 1994 issue of Radio Electronics magazine. The...
Half duplex link for optical fiber (CB9733E)
This circuit was found in a 1980s American documentation. The data circuit has a low speed,...
Simple Alarm (CB25944E)
This simple alarm with latching uses a relay as the main element. The circuit is from a Radio...