the multifunction electronic probe and instrument composed of 555

Published:2011/9/8 6:16:00 Author:Ariel Wang | Keyword: multifunction, electronic probe , instrument | From:SeekIC

You can plug two electrodes in CK1.The oscillation frequency becomes higher as the resistance of the points is low.When the distance between the points and the detectors becomes farther,the frequency becomes lower.In this way it is to reach the points detection.The timer is made up by ICl(555),R5,W2 and C3.The pulse generator is the multivibrator composed of W4,R8,D3,D4,W3 and C4.The oscillation frequency is f=1.44／(Rw4+R8+Rw3)C4.You can adjust the potentiometer W3 and W4 to change the oscillation frequency and duty ratio.



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