Binary demonstrator (CB22148E)

This circuit serves as a binary demonstrator using 3 LEDs. The circuit can be scaled up for a higher count.

TTL LS Debouncer (CB16001E)
Two inverters, of the 6 available in a Low-power Schottky 74LS04, are used in this anti-ring...
4-scale millivoltmeter (CB7389E)
Found in Radio Electronics from the 90's, this circuit can be implemented with other operational...
Varistor Modulator (CB21915E)
Taken from a 1956 Raytheon transistor manual, this circuit uses varistors to obtain modulation of a signal...