Serving guest doorbell and dog alarming circuit diagram

Published:2011/6/23 22:11:00 Author:Nicole | Keyword: Serving guest doorbell, dog alarming | From:SeekIC

The monostable trigger circuit is composed of IC2-m(1/2 556)and R3, C3, its monostable working time is decided by R3, C3's charge time constant, the monostable time is t1=1.1R3C3. The graphic parameter t1 is about 100s. In the period of IC2-a is set, VT3 is saturation conduction, VT4 cut off, C5 changes from the short circuit state to charge state. The delay control circuit is made of IC2-b(1/2 566)and R5, C5, the delay depends on the R5C5's charge time constant, namely, when IC1-b(1/2 566)'s 8 foot and 12 foot are dropped to 1/3VDD by C5's charge, 1/2 566 is set, 9 foot turns to high level, then the dog braying analog integrated circuit(HFC5201)obtains electricity and it sends out barking. The barking time t2 is t2=1.1R5C5. The graphic parameter t2 is about 1 minute.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/Serving_guest_doorbell_and_dog_alarming_circuit_diagram.html

Print this Page | Comments | Reading(3)