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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Headlight indicator 555 (CB9118E)
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Variable Active Cycle 4093 (CB15916E)
The oscillator shown in the figure keeps its frequency constant in an active cycle adjustment...
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This circuit was found in an Argentine publication from the 1970s. The circuit can be assembled with...