High impedance stage (CB20564E)

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

Capacitive Code Switch (CB10446E)
This circuit was obtained from a Radio & Electronics Constructor from March 1976. The magazine no...
Walkman Power Supply (CB17969E)
This is a 5 V power supply from 2002 documentation, suitable for walkmans and diskmans, common at the...
SCR Relaxation Oscillator (CB12717E)
This type of oscillator uses an unusual configuration and can be used as a time base, metronome or rhythm...