Found in an American documentation from the 90s, this circuit uses small low voltage lamps (6 to 12 V0. The circuit can be adapted to use LED indicators.
This circuit was found in a British documentation from 1969. It can be implemented with modern...
A simple VCO using two inverters in a ring configuration is shown here. A VCO is a circuit in...
The four gates of a 40111 IC are used in thes two-out circuit. The output chages their state in a...