LM311 current detection circuit

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the current detection circuit posed by the LM311 In this circuit, when VT1 gate for the high-input control signals, used a VT1 as current detector.When the DC motor armature M's rotation, the two rectifier brush-instantaneous short-circuit, a current pulse, and then through the RDS VT1 to transform its voltage signal, and the exchange coupling capacitance C1-A1 compared to the same phase input End. C2 play a role in filtering, A1 can clean waveform output, and 5 feet 6 feet and the combination of features, Xiaojian clock output for the edge.

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