Light emission and audio probe circuit

Published:2011/4/14 4:36:00 Author:Nicole | Keyword: light emission, audio probe | From:SeekIC

NE556 timer circuit is connected into oscillator by IC3, and controlled by IC1(SN74132N) and IC2(SN7486N). It can use audio vibration with digital logic point static state, it is convenient for blind experimental personnel. When it happens a logic abrupt change form 1 to 0 or 0 to 1, once the duration is beyond 50ns, this circuit can detect, and send out a report with dodo . LED is usedfor naked-eye observatio, when the input is logic 1, then LED light emits.



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