Resistance Quick Tester Diagram Circuit

Published:2011/6/16 10:52:00 Author:Vicky | Keyword: Resistance Quick Tester | From:SeekIC

The above picture is the Quick Resistance Tester Diagram Circuit. The core of the circuit is multivibrator composed of 555, R1, R2, R3, Rx (resistance under test) and C1. Resistances numbered from R4 to R9 are known resistance of the tester. A circle of the multivibrator output signal is T=0.693[R1+2(R2+R3Rx/(R3+Rx))].The frequency of the multivibrator can be changed when the position of gating switch K is changed, and thus signal of different tones is given out from the speaker. Because the resistance values of resistances numbered from R4 to R9 are known and Rx is a to-be-tested resistance, it is easy and quick to estimate the range og resistance value of the resistance under test by comparing with the loudness level of the know resistances’ corresponding oscillator frequency.



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