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Switching circuit

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alok9406

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I want to make a switching device with following features:

One senor will sense speed(frequency of a moving car, then this is fed to my circuit(to be designed). This circuit has three relays which are actuated when three pre-decided values of frequency(or current) are achievedi.e. there are three events-1. when certain frequecy(sensed by speed sensor) is achieved, first relay operates,2. on higher frequency second relay operates and 3.on further higher frequency third relay operates.
Please help me,
alok
 
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