Heartbeat Detector (CB25472S)

This heartbeat sensor circuit was found in the July 1992 issue of Radio Electronics magazine. The circuit uses a 741 with a single power supply.

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Low Frequency Astable (CB470E)
The astable multivibrator shown by the figure can produce signals in the 10 to 10 000 Hz band...
Microcontroller SE C1000 Intel® Quark ™ (COM051E)
August 2016 - Mouser Electronics is supplying the microcontrollers IF C1000 Intel Quark that...
Locked Output Detector (CB4814E)
We found this circuit in a Popular Electronics of the 90s. Its purpose is to detect when it locks...