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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Electronic Bongo (CB19817E)
We found this circuit in an old documentation. The integrated circuits used are specific to...
Electronic Bongo (CB19816E)
The integrated circuit used in this application is uncommon today and specific to the application, as it...
Classic Buzzer (CB26048E)
This 3-transistor buzzer or buzzer is a classic type found in the July 1998 issue of Electronics Now...