METAL_PIPE_DETECTOR

Published:2009/6/17 22:32:00 Author:May | From:SeekIC

This circuit uses a 15-kHz oscillator coil. When metal placed in the energy field is withdrawn, the oscillator voltage is rectified and compared to a reference. A drop in oscillator voltage therefore op-erates comparator IC2 and D4 (LED) extinguishes.



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