guruparan.eee
New Member
I am trying to do a circuit which detects the missing tooth from a gear wheel and gives a output if the tooth is missing using a magnetic transducer ?
anyone help me please![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
anyone help me please
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One way would be to use a phase locked loop locked to the normal tooth frequency. That would generate a clock edge that could be used to sample the missing tooth... You could do this in software inside a uController, too, i.e. compare the previous period between the two last teeth to a running average period.
could you plese tell me what components i could use??
It would seem to be difficult to get a phase locked loop to lock in over "any speed".One way would be to use a phase locked loop locked to the normal tooth frequency. That would generate a clock edge that could be used to sample the missing tooth... You could do this in software inside a uController, too, i.e. compare the previous period between the two last teeth to a running average period.
Such a missing pulse detector will only work for a fixed frequency, since the 555 time must be set to be slightly longer than the period between pulses. It won't work for a range of speeds as the OP desires.Why not do it simply? Use a 555 timer to make a missing pulse detector, like this one; Missing Pulse Detector