This is an over-speed sensor module, that provides an audible warning and signals output when the speed of a machine is above a set point. The module can be used in applications such as Engines, Machines, Sports machines, and Fitness Equipment. The speed of the machine or engine can be detected using magnetic pickup sensors. The project can be used in many applications where an over-speed monitor is important. The board is based on the LM2907 chip that works as a frequency-to-voltage converter, interfacing a magnetic pickup as shown in the figure below. A typical magnetic pickup for automotive applications will provide a thousand pulses per mile so that at 60 mph the incoming frequency will be 16.6Hz.
more information: https://www.electronics-lab.com/project/over-speed-sensor-over-speed-alarm-using-magnetic-pickup-sensor/
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