Detector and counter (CB21510E)

This circuit was taken from old American documentation. The circuit provides pulses obtained from a magnetic sensor for application in meters.

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Dual Frequency Generator (CB16305E)
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The circuit, illustrated in the figure, consists of the direct application of the ULN2003 in which...
Ultrasonic ear (CB21314E)
This circuit was found in a Popular Electronics from the 90's. The output signal can be applied to a...