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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Telephone Line Simulator for Internal Communication (CB18068E)
This circuit is a telephone line simulator and can be used for internal communications. It is...
Digital One Digit Counter (CB13406E)
This digital didactic digit counter uses common TTL integrated circuits and a common anode...
RF power meter (CB8977E)
This reflectometer or standing-wave ratio meter (SWR) was found in a 1980s American documentation. The...