The liquid concentration measuring circuit

Published:2011/5/22 1:08:00 Author:Borg | Keyword: liquid concentration, measuring circuit | From:SeekIC

This is a liquid concentration measuring circuit. The principle of the circuit is that to insert two poles in the liquid, and get the voltage, then the concentration of the liquid is indicated by the meter. The AC voltage is reduced by the transistor of T1, and then is change into a square wave potential after passing VDZ1 and VDZ2, the stabilizers. Thus, the AC voltage is hold by the stabilizer tube, and the change of power supply wouldn't affect the measured circuit. The square wave potential is imposed on the base electrode of VT1 by the pole, and it changes with the concentration of the liquid.



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