High impedance stage (CB20564E)

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

Voltage Level Switch (CB21463E)
This voltage level-triggered circuit was found in a 1969 Ferranti English documentation. Modern...
100 Hz pulsed alarm 555 (CB8439E)
Using 555 integrated circuits, this alarm circuit was found in a 90s American documentation. The signal...
Capacitive Touch Switch (CB13154E)
Unlike the CIR4620 circuit, the circuit shown in the figure operates by capacitance. This means...