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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Adjustable Power Supply (CB15755E)
The circuit in the figure is from a source with the possibility to adjust the output voltage from...
Neon Lamps Sawtooth (CB13933E)
We found this circuit in an old magazine 73 of 1974. The circuit must be powered by a continuous voltage...
741 MW radio (CB10644E)
This circuit is from a 1987 American publication called Electronics Handbook. The circuit can be...