The proximity switch circuit with integrated magnetic field sensor HMC1001

  
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As shown in figure, the proximity switch circuit is composed of HMC1001, operational amplifier (AMP04) and light emitting diode (LED). The operational amplifier is used as a comparator. When you move magnet with length being 6mm~12mm to HMC1001 in a predetermined position, the output voltage of MR bridge will reach 30mV, then the comparator flips, and output..
The proximity switch circuit with integrated magnetic field sensor HMC1001 - schematic




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