the circuit of the animal baby announcer (2)

Published:2011/6/27 23:36:00 Author:Ariel Wang | Keyword: animal baby , announcer | From:SeekIC

In normal times,the resistence between the sensor's electrode A and B is large.The input end of not gate D1 outputs low level.The output end outputs high level.The output ends of not gate D2～D4 output low level.IC2 stops working.The wireless receiving alarm circiut can't receive wireless alarm signal.The loudspeaker BL can't give a sound.When animals have babies,the resistence between the sensor's electrode A and B is small.The not gate outputs low level.The not gate D2～D4 output high level.IC2 is conducted to work.It emits wireless alarm signal to the sky.When IC3 recieves the wireless signal from IC2,the L end outputs high level,V1 is saturated to conduct.IC4 is conducted to work.The O/P end outputs acoustics signal.It is amplified by V2.The driver BL gives out alarm sound.



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