ISD1016 Voice Recorder (CB25448E)

This 16-second voice recording circuit was featured in a telephone answering machine circuit in the March 1992 issue of Radio Electronics magazine.

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SCS 5 kHz stages (CB9068E)
This SCS counter circuit was found in a 1964 General Electric documentation. The circuit has a...
Reflex receiver (CB23633E)
This simple 1-transistor reflex receiver was published in Radio Electronics magazine in September 1959....
High Impedance Differential Amplifier (CB4896E)
Operational amplifiers used in this 80's circuit is not very common today, but the setting can be...