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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Bargraph Peak Detector LM3915 (CB14385E)
This circuit was obtained in the National Semiconductor Linear Applications Handbook of 1994. The...
SCR Variable power supply (CB8894E)
This circuit was found in a Hands-On Electronics. Some restrictions must be considered as the need...
Skin Temperature Monitor (CB10960E)
This circuit was found in a 1987 magazine. It measures the resistance of the skin using a...