The broad range digital capacitance measuring instrument circuit

Published:2011/6/5 22:18:00 Author:Seven | Keyword: broad range, capacitance, measuring instrument | From:SeekIC

Pulse generator is a multi-resonate oscillator which consists of IC1(556), R1, R2, C1,R3, R4, C2 and so on, the oscillating frequency is f1= 1.44/(R1+2R2)C1, or f2=1.44／(R3+2R4)C2。The output pulse of 9-pin rises and the output terminal Q of D trigger IC2(CD4013) generates a low LEV, and the low LEV is added to the EN terminal of the counter IC4(cd4017), which makes the counter in the working state. The pulse output by the 5-pin controls the DIS pole of the 3 bit BCD counting circuit IC5(MC14553B). The capacitor volume under test --frequency shift circuit consists of R7,R8,IC3 and the capacitor Cx under test.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Measuring_and_Test_Circuit/The_broad_range_digital_capacitance_measuring_instrument_circuit.html

Print this Page | Comments | Reading(3)