Roman numeral display (CB22160E)

This circuit shows numbers I II and III when mounted on its side, depending on the position of the selector switch.

Pulse Inverter (CB22285E)
Using an era germanium transistor, this 1960s circuit reverses the phase of relatively low...
Voltage Comparator (CB6549E)
This circuit uses amplifiers from the 60's American company Microlin. The circuit can be designed...
Audio Booster (CB23695E)
The idea of this circuit found in a Radio Electronics from January 1966. The idea of the...