Additional Pull Pull (CB6119E)

This stage was found in a 1964 Electronic Design. The transistors are of the time and the shape of the signal obtained is shown in the diagram.

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Bridge High Impedance Amplifier (CB4937E)
This circuit is from the 80's and can be implemented with modern operational amplifiers equivalent...
Beat Oscillator (CB4208E)
Placed near a common receiver, this oscillator is intended to generate a beating signal to receive...
Impedance Matcher (CB17370E)
This 2000 circuit can be used to match the low impedance of a microphone to the high input...