This circuit was found in an Elektor from the 90s. Next to the circuit we have a table with the delays obtained when the circuit is connected according to the positions of the selector switches.
This circuit is from a 1965 General Electric manual. It uses components from the time that admit...
In this circuit, which uses one of the four comparators of an LM339 (or LM139 or 239), capacitor C1 and...
Found in an old American documentation, this circuit uses neon lamps as a reference to obtain a...