Published:2009/7/13 4:56:00 Author:May | From:SeekIC
Impurities in water provide conductivity for completing circuit of transistor when water reaches level of sensing electrode, energizing relay that starts pump motor. Extra set of contacts on relay keeps motor running until water drops to predetermined lower level. Diodes are 1N4001 or equivalent, rated 1 A. Fuse should be chosen to pass normal motor current. Use 12-V double-pole relay. T1 is 300-mA filament transformer.-J. H.Gilder, Automatic Turn-On, Modern Electronics, Dec. 1978, p 78.
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