DTMF Decoder (CB25048E)

This circuit was found in the 1987 Radio Electronics magazine. The components used are integrated circuits of the time.

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Remote Control Extender (CB26151E)
This circuit appeared in the 1991 Electronics Experimenter Handbook. The circuit is for remote...
Power control (CB23586E)
This circuit was found in Radio Electronics magazine from January 1959. The power transistor must...
Atmospheric noise monitor (CB21066E)
This circuit uses an MW radio tuned to around 540 kHz to detect atmospheric signals, for example, from...