2 1 century has entered a brand-new era of information society. The foundation of the information society is electronic technology, which is a highly practical technical subject. With the development of electronic technology, it has penetrated into every field of life, and the responder is no exception.
Answering device has been widely used, and all aspects of technology have been very mature. With the appearance of digital tube and the rapid development of science and technology, it is inevitable to apply digital display to transponder, and it is also a perfection and supplement to the function of transponder. Based on the background of intellectual knowledge contest, this design designs a respondent who can give priority to the respondent's group number and give a sound reminder, while shielding the responses of other groups. This design can be completed by investigation, using the knowledge of digital and analog electricity, using single chip microcomputer or electronic technology. Although single-chip microcomputer has the advantages of intelligence and programmability, considering the high cost and difficult programming of single-chip microcomputer, we decided to use discrete components to complete it. We design the receiving part, the control part, the audio part and the DC regulated power supply part by the method of module completion and comprehensive connection. After debugging, all the functions are all right. Finally, after connection and assembly and comprehensive debugging, the whole design can realize the functions of resetting and clearing the host, recognizing and latching the first answer signal, displaying the receiver's packet number, making a buzzer and so on, which meets the design requirements.
Keywords: digital display answering circuit timing circuit of answering machine
abstract
The 21st century has entered a brand-new era of information society, which is based on electronic technology and a highly practical technical discipline. With the development of electronic technology, it has penetrated into all fields of life, and the punch is no exception.
Answering device technology is widely used, and all aspects are very mature. With the advent of digital coding and the rapid development of science and technology, it is necessary to apply digital display to the responder, which is also the improvement and perfection of the responder's function. This competition is based on the design of intelligence and knowledge, a responder with priority display design that can respond to the number of people and give out noise warning, and at the same time block the function of responding. This time to complete the technology, we can carry out electronic design of single chip microcomputer through investigation and study or using the knowledge of digital-analog electricity. Although single-chip microcomputer has the advantages of intelligence and difficult programming, for single-chip microcomputer, we think it is expensive and difficult to program, so we decide to use independent components to complete it. We design the responder, control part, audio part and DC regulated power supply part respectively by using the comprehensive method of block completion and connection. After testing, the functions of all parts are finally connected, assembled and comprehensively debugged without problems. The whole final design can realize the functions of resetting and resetting the host, identifying and locking the existing response signal by the responder, displaying the group number of the responder, and making a buzzer sound, which meets the design requirements.
Keywords: answering machine, digital display answering machine
The time circuit of that circuit
catalogue
Chapter 1 Introduction 1
Chapter II Scheme Selection 1
2. 1 Brief introduction of two schemes 2
2.2 Option 2
Chapter 3 Design Concept Block Diagram 3
Chapter 4 Design Process 4
4. 1 First answer Part IV
4. 1. 1 Answer button and coding Part 4
4. 1. 1. 1 Button Input Circuit Design 4
4. 1. 1.2 coding part design 4
4. 1.2 Latching and decoding display section 7
4. 1.2. 1 decoder design 7
4.1.2.2 Introduction of LED digital tube 10
4.1.2.3 Introduction to 74ls279 Trigger 1 1
4.2 control part 14
4.3 Audio Circuit 15
4.3./introduction to kloc-0/555 timer 16
4.3.2 Circuit diagram and working principle 17
4.4 regulated power supply part 17
4.4. Introduction to1Three-terminal Integrated Regulator 17
4.4.2 bridge rectifier and capacitor filter circuit 18
4.4.3 DC regulated power supply 19
The fifth chapter working principle and welding debugging 20
5. 1 working principle explanation 20
5.2 Welding of components 20
5.3 Debugging of Circuit 22
Chapter VI Component List 23
Chapter VII Summary 24
Reference 25
Acknowledgement 26
Appendix A Circuit Full Picture 28 The above answers come from:/html/42-6/6474.htm.