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| Electronic Projects Design/Ideas/Reviews Are you building an electronic project or want to? Maybe you need some assistance? Come and submit your electronic questions here and let our experienced members find a solution. |
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27th May 2004, 04:37 PM
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 Switching circuit 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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27th May 2004, 05:09 PM
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| Hi! You should use a frequency to voltage IC and 3 comparator gate. Adjust the thresold of each gate so it put on the relay (by passing by a transitor and a diode) at the good level. Good luck, | |
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