Published:2011/7/15 21:47:00 Author:Ariel Wang | Keyword: alarm , water break , spray pipe , seeding-machine | From:SeekIC
When the mains switch S gets through,the water break detected circuit and the sound and light alarm are conducted to work.When the spray pipe of any circuit is blocked,the SenseFET is conducted as the base electrode becomes high level.The transistor of the circuit is conducted.The LED of the circuit is lighted.It indicates how many the blocked spray pipes are.At the same time,V6 is conducted.The multivibrator and the controlled audio oscillatory circuit are conducted to work.B1 gives out alarm sound.For example,when the spray pipe of circuit A is blocked,there's no water spraying out from the sprayer in circuit A.V1,VT1 and V6 are conducted.VL1 is lighted.VL7 is lighted.BL gives out alarm sound.
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