the alarm circuit of the blocked seed channel in seeding-machine (1)

Published:2011/7/7 6:43:00 Author:Ariel Wang | Keyword: alarm , blocked , seed channel , seeding-machine | From:SeekIC

VL and VD are relatively set in the transmit seed tube.The infrared light which is emitted by V2 shines on VD.When seeding,if the transmit seed tube of the seeding-machine works right.The infrared light is sheltered by the seeds every now and then.The base electrode of V1 will generate a series continuous negtive pulse.V1 is conducted at a interval time.The pin-2 and pin-6 output low level.The pin-3 outputs high level.V2 is saturated to conduct.The audio oscillator consists of Y3,Y4,C5 and R7 stops oscillation.B1 doesn't give a sound.You can adjust the resistence of RP.It can change the action sensibility of the the trigger circuit.



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