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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AD Converter Circuit Test (CB16683E)
This circuit was found in Intersil's 1992 documentation consisting of a test for ADc0801 and...
Lamp control (CB21962E)
This 60's shield or driver employs germanium transistors. The circuit is from a 1960 Gernsback...
Transparent Octal Latch (CB15750E)
The circuit shown in the figure on the right can be used on a data transfer bus with the use of an...