Water level indicator circuit (2)

Published:2011/5/26 22:30:00 Author:Christina | Keyword: Water level, indicator | From:SeekIC

Circuit operating principle This water level indicator circuit is composed of the water level detection electrode A-E, the four two-way analog switch integrated circuit IC, the light-emitting diode VLl-VM, the resistors Rl - R9, the audio amplifier tube V and the buzzer HA.etc, as the figure shows. The electrode A is the low water level electrode; the electrode B is the 1/4 water level electrode, the electrode C is the 1/2 water level electrode, the electrode D is the 3/4 water level electrode; the electrode E is the high water level electrode. When the water tank's water level is 1/4, the water resistance connects the electrode A with the electrode B, pin-13 of the IC has the high electrical level, the switch S1 of the IC opens to turn on the VL1.



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