High impedance stage (CB20564E)

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

Half wave control (CB21375E)
This circuit for heating elements was taken from a 1966 General Electric manual. The SCRs are...
Guitar Distorsion Pedal (CB18205E)
This simple circuit with two transistors was found in a 1985 publication. The power can come from...
Field Strength Meter (CB14899E)
This circuit detects signals in a wide range of frequencies, indicating their strength in an...