We find this circuit in an Electronics Now. The indication of the logic level is done on a 7-segment display according to the connections given in the diagram.
This 600-ohm output impedance circuit was found in a Radio Electronics from October 1963. The...
This circuit with the 555, was obtained in a 90s American documentation. The signal must be...
This circuit receives a European name, as it is from documentation translated from the 80s. The...