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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Triangular Generator with DA Converter MC10318 (CB14551E)
The circuit shown is from the Motorola Linear Databook of 1990. This circuit converts signals in...
4047 Astable (CB23737E)
In the circuit in the figure, we have the production of rectangular signals with frequencies of up...
Light Sensitive CMOS Astable 4011 (CB907E)
This circuit uses a photoransistor to control the frequency for this oscillator. Power supply...