the circuit of the chickling hatching announcer(3)

Published:2011/6/28 5:59:00 Author:Ariel Wang | Keyword: chickling, hatching, announcer | From:SeekIC

When the mains switch gets through,the whole control circuit is at the state of waiting.The not gate circuit D4 outputs low level.The transistor V is stopped.The relay K is released.HA doesn't give a sound.When there are baby chicken ,BM will convert the sound of the chickling to the electric signal.The electric signal is amplified by not gate D1,reversal processed by D2.Then it outputs high level.The output end of not gate D3 outputs low level.The LED VD1 is conducted.The output end of not gate D4 outputs high level.The transistor V is saturated to conduct.The relay K is conducted to pull in.The normally open contacts are connected.HA gives out alarm sound.



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