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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50 W amplifier (CB16700E)
This 1992 circuit uses an integrated circuit not common today. The Sanyo integrated circuit must...
Digital Watch MA1010 (CB19859E)
This was one of the National Semiconductor clock modules very popular in the 70s and 80s. In the...
D - A Converter (CB16016E)
This digital / analog converter shield is suggested by MOTOROLA and is based on an operational amplifier...