the circuit of the chickling hatching announcer(1)

Published:2011/6/28 7:19:00 Author:Ariel Wang | Keyword: chickling hatching , announcer | From:SeekIC

The 220V AC voltage is current limited by R1,commutated by VD,regulated by VS and filtered by C1.It provides +12V working voltage for the audio amplifier circuit.When there is no chickling hatching from the eggs in the incubator.BM can't detect the sound signal.V2 and VT aren't conducted.HA doesn't give a sound.VL and HL aren't lighted.When there is chickling hatching out from the eggs,BM will convert the sound of the chickling into the electric signal.The signal is amplified by V1.V2 is conducted.VL is lighted.VT is triggered to conduct.HA is conducted to alarm.HL is lighted.You can change the capacitance to adjust the sensitivity of the alarm circuit.



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