Digital Thermometer (CB24793E)

This circuit was found in the March 1984 issue of Radio Electronics magazine. The sensor is a transistor. The module is a common type at the time.

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Polarity Test (CB14701E)
This polarity test or indicator indicates the polarity of a power line by LEDs. The circuit is...
Digital clock MM53149 (CB24361E)
This is the circuit of a digital clock published in the January 1975 issue of Radio Electronics magazine....
Powergrid timer (CB9364E)
Found in an Elektor from the 90s, this circuit can be powered directly by the power grid. The...