Telephone line interface (CB8659E)

Found in a 90s Popular Electronics, this circuit allows Interfacing electronic applications with the telephone line.

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Signal Generator (CB24108E)
This small signal injector generator was found in the February 1971 issue of Radio Electronics magazine....
15 W Amplifier (CB16380E)
This amplifier, found in a 1981 publication, provides 15 W lHF power with a supply voltage of 14.4...
Photoelectric alarm (CB23798E)
This simple passage alarm is powered by the power grid using an LDR as a sensor. The circuit is...