the alarm circuit of water break in the spray pipe for seeding-machine(4)

Published:2011/6/29 7:13:00 Author:Ariel Wang | Keyword: alarm , water break , spray pipe , seeding-machine | From:SeekIC

When the spray pipe is blocked,the output end of the not gate outputs high level.The output end becomes low level.The LED of the circuit is lighted.It indicates how many the blocked spray pipes are.At the same time,the audio oscillatory circuit works.BL gives out alarm sound.For example,the spray pipes in circuit A are blocked.Then there's no water in sprayer spraying out.The not gate D1 outputs low level.VL1 is lighted.The NAND gate D5 outputs high level.VD1 is conducted.The audio oscillator works.After the audio oscillatory signal is amplified by V,the driver BL gives out alarm sound.



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