Along the way, have you --- Chinese women's volleyball world championships in milliseconds precision digital design
1 Introduction: Component manufacturing bar scale components industry is a major component, but also the electronic information industry base support milliseconds precision digital design support bar scale industry, its technological level and production capacity directly affect the development of the whole industry. No precise digital electronic components milliseconds design ubiquitous, whether it is daily consumer electronics products or industrial electronic equipment, are made based precision digital milliseconds design composed of the electronic components. Electronic components are electronic information industry of intermediate goods, and raw materials between the electronic machine industry sectors ranging, speed of its development, technology and production scale are achieved, not only directly affects the development bar scale of the electronic information industry, bar scale but also for The development of information technology to transform traditional industries and improve the modernization level of equipment, promote scientific and technological progress are of great significance. Since the 1990s, the rapid development of China's electronic components manufacturing industry and achieved remarkable results, has become bar scale an important basis for supporting the development of China's electronic information industry. At present, the domestic production of electronic components by thousands of enterprises, closely related upstream and downstream enterprises have tens of thousands of homes, the electronic information industry output value accounted for about one fifth. The level of development of electronic components manufacturing industry depends not only on its own development, but also with its position and role in the electronic information industry bar scale chain has a close relationship. Electronic information industry chain is composed of raw material supply, development, production, marketing and complex chain of service until a continuous link constituted the final product. Multiple or fraction of a general measure of time to stabilize the cyclical movement as the basis for selection criteria for the periodic motion of the cycle time units. Time is a cyclic physical phenomena can be observed and measured physical quantities. In the International System of Units, the main unit of time in seconds. Time is a continuous, unidirectional and serial in nature, and constantly bar scale move forward. Newton's classical theory bar scale that space and time: Time is absolutely nothing bar scale to do with the frame of reference, has nothing to do with the space. Einstein's theory of relativity bar scale is considered: Time is relative, and the frame of reference and space are closely linked. The establishment of quantum mechanics, but also questioned for the continuity of time, made a point of minimum time interval. In the macroscopic measurements, often need to use larger than the second unit; while at the micro areas, and often use smaller units than the second. So we often use multiple or fraction of a second to indicate the time. Early timing products used in complex circuits, connectors and more job insecurity phenomena often occur during use. Most of them are using a light bulb and phototransistor, due to the brighter daylight, when the object through the photoelectric doors, light bright, dark, did not change significantly, could easily lead to measurement errors phenomenon. The design of precision digital milliseconds from the time base pulse generator, a control bar scale circuit, counter display bar scale circuit, clearing the circuit, power circuit, bar scale photoelectric switches and photoelectric gates timing system. The main features bar scale of this machine are: circuit simple, low cost, easy fabrication, high accuracy, the circuit is stable, strong anti-jamming capability. Graduation design specification of Contents 1 Introduction ------------------------------------------- ------------------------- 82. demonstration program -------------------- -------------------------------------------- 8 2.1 program an -------------------------------------------------- ---------- ---------------------------------- 8 2.2 Option II -------------------------- 93. each circuit design and verification ---------------- --------------------------------------- 11 3.1 power supply circuit design and verification - --------------------------------------------- 11 3.1.1 Rectifier Circuit ------------------------------------------------- ------- 3.1.2 filter circuit ------------------------------------- ------------------- 12 3.1.3 regulator circuit ------------------------ Select Parameters 14 3.1.4 -------------------------------- main components --------- ------------------------------------ 15 3.2 ------ circuit bar scale design and verification -------------------------------------------- 16 3.2.1 clear circuit design and verification bar scale ------------------------------------------- 16 3.2.2 When the base pulse generating circuit design and verification ----------------------------------- 193 .2.3 count display circuit design and verification ---------------------------------------- 24 3.2.4 Optical door ------------------------------------------ bar scale -------------- 29 3.2.5 Control circuit design and verification ------------------------- ------------------ 30 4 Appendix ---------------------------- --------------------------------------- 35 4.1 parts list ------ -------------------------------------------------- -35 4.2 Schematic -------------------------------------------- bar scale ------------- 35 5 overall debugging ------------------------------- ------------------------------- 37 6 References -------------- ---------------------- 38-bit components list No. Model No. Name and Spec Num a resistor R1. R4 R6 RJ11-10K-0.5-I bar scale 3 R2 RJ11-200-0.5-I 1 R3 RJ11-330-0.5-I 1 R5 RJ11-15K-0.5-I 1 R7 RJ11-1K-0.5-I 1 R8 RJ11-2M -0.5-I 1 2 capacitor C1 C2 C3 C4 C5 CL11-104-63-I 5 3 digital A1 A2 A3 A4 LED 4 4 8-bit LED driver IC8IC91C10IC11 74LS48 4 5 TTL dual-decimal counter IC2IC6 IC7 74LS390 3 6 op amp U11 314,017 timer counter U9 NE555 1 8 three-terminal fixed output regulator U8 7805 1 9 bridge rectifier U1 IN4007 1 10 NAND gates B1 B2 B3 B4 74LS00 4 11 NAND gate B5 B6 CD4049 2 12 light control switch K1 1 / machine control K2 / K2A AN4 1 K3 KB-1 1 Manual K4 1 automatic 13 switches S1 / S1A S1B / S2B KB-1 2 14 optical gate A Da 1 15 optical gate B Db 1 16 photodiodes Da 2CUS3 1 Db 2CU1A 1 17 sliding rheostat W1 1 0-100K 18 bulb 119 outlets a whole host circuit debugging generally do not need to adjust, as long as the work can be installed correctly. Mainly by infrared photoelectric door two doors and stand pipes and optoelectronic components. bar scale Infrared diode should be fixed on the external casing and optical gate bracket (we use 0. 1A, 6. 3V indicator seat modification, because lamp, shade all with nuts, easy installation, and infrared diodes mounted on the inside size is appropriate). Optical gate installed, after the access circuit, available digital multimeter to measure the infrared emitter voltage of the tube ends, the normal value should be around 1. 15V, such as too much deviation may be mistakenly loaded became the launch tube receiver tube, to adjust. As long as the optical gate installed correctly aligned on the axis of the hole, the measurement of the voltage across the receiver should be about 0. 18V, such as the deviation is too large, the infrared diode to be fine-tune the position of the optical gate. Installation should pay attention to the light source must be aligned optical gate photodiode, in the case of optical gate access to the host, and if the two are not aligned, the host will keep count, then you can fine-tune the light source or light-sensitive tube, until the host stops counting so far. If the installation is not wrong, it is generally necessary to time base oscillator frequency 100KHZ be more positive (adjusted C6) can work properly. References 1 Electronic Engineering Manual series of books (electronic books) Beijing: Electronic Industry Press, 19962 newsletters (bound bar scale volume), 1988-1998 Chengdu: Chengdu University of Science Press, Beijing three new IC Application Notes : Electronic Industry Press, 19914 newest electronic components Daquan Beijing: Electronic Industry Press, 1996 5 TTL CMOS circuit bar scale Beijing: Electronic Industry Press, 19916 Digital Electronic Technology & nb