In this paper,
This internship the designed eight-way responder in addition to the basic vies to answer first function, but also has alarm function.Circuit can be simultaneously eight-way first vies to answer first, press the button, after circuit with hum, at the same time show first vies to answer first the number number.After the success of the vies to answer first, and then press the button, the display will not change, unless by pressing the reset button.After reset, display, can continue to vies to answer first.The entire circuit including vies to answer first, coding, priority, latches, quantity and reset circuit, SB1 to SB8 vies to answer first key.SB9 to reset, CD4511 is a BCD - 7 sets latches, decoding, drive circuit for the integration of integrated circuit, it adopts 74 ls148 to achieve responder pick.74 l279 chip to realize the number of the latch, the decimal system is realized by using 74 ls192 counter, alarm signal is realized by using 555 chip to produce the pulse signal output.
The practice through courses designed to improve and consolidate what they have learned basic knowledge, and comprehensive application of knowledge and welding technology
Keywords: buzzer, encoding, decoding, call the police.