Consisting of 555 water and sewage control circuit

Published:2011/6/18 8:01:00 Author:Fiona | Keyword: consisting of 555, water and sewage control | From:SeekIC

The controller consists of the step-down rectifier circuit,the water level probe (a, b, c),555 trigger,relay control circuit and so on.The step-down rectifier circuit provides DC voltage for the whole control circuit.When controller is used for water tower sheung shui,if the water level is below the point b,then 555 is set due to the ② pin potential is low level,the high level output by 3 pin makes the relay J close,contact J1-1 connects,pump starts to sheung shui. When the water level rises to a point,555 is set due to the ⑥ pin potential is higher than 2/3VDD,the low level output by 3 pin makes the relay J release,contact J1-1 is off,pump stops without electricity.So that the water level maintains a certain range.



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