The wide range digital capacitor gauge(NE555, CD4017 and MC14553B)

Published:2011/8/14 22:07:00 Author:qqtang | Keyword: wide range, digital capacitor gauge | From:SeekIC

In the figure is a wide range digital capacitor gauge(NE555, CD4017 and MC14553B). The gauge consist of the pulse generator, reference capacitor volume-frequency converter, capacitance volume-frequency converter under test, counting controller, counter and display circuit, etc. The pulse generator is a multi-resonance oscillator which consists of the IC1, R1, R2 and C1(R3, R4 and C2), its oscillating is f1= 1.44/(R1+2R2)C1, or f2=1.44/(R3+2R4)C2. The upper edge of the pulse output by 9-pin makes the D trigger IC2 (CD4013) output terminal Q generate a low LEV.



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