This circuit was found in the February 1983 issue of Radio Electronics magazine. It is a 4-digit circuit with dedicated integrated circuits, with no power supply indicated.
With this circuit it is possible to use a DC buzzer (not a transducer) as an extension of the...
This circuit allows feeding a small semiconductor laser to obtain a useful resource for...
This circuit comes from a Gernsback Publications of the 90s. The circuit uses a general-purpose transistor as...