小型电子声光礼花器 毕业论文外文翻译.doc

小型电子声光礼花器小型电子声光礼花器是一种模拟礼花燃放的电路，主要的工作内容是模拟礼花色彩的发光和模拟礼花爆炸声的发声，广泛应用于家庭庆典、朋友聚会、联欢晚会、儿童玩具及一些趣味性等场所的电子产品。 小型电子声光礼花器实质就是用一个振荡电路发出方波振荡信号触发模拟礼花色彩的发光电路和模拟礼花爆炸声的发声的电路的方式，不仅应用在电子声光礼花器电路，在其它的电路应用也很普遍，如模拟电话铃声电路、简易催眠器、直流电机调速控制电路、门铃电路等。小型电子声光礼花器与礼花炮相比具有环保、安全、适合在室内等优点，缺点是没有礼花炮燃放时的那种像飘落了流星雨的感觉，而且电路复杂不易维修等。在谈小型电子声光礼花器之前，先熟悉一下时基集成电路555振荡电路，555集成电路开始是作定时器应用的，所以叫做555定时器或555时基电路。但后来经过开发，它除了作定时延时控制外，还可用于调光、调温、调压、调速等多种控制及计量检测。此外，还可以组成脉冲振荡、单稳、双稳和脉冲调制电路，用于交流信号源、电源变换、频率变换、脉冲调制等。由于它工作可靠、使用方便、价格低廉，目前被广泛用于各种电子产品中，555集成电路内部有几十个元器件，有分压器、比较器、基本r-s触发器、放电管以及缓冲器等，电路比较复杂，是模拟电路和数字电路的混合体,如图1所示。 555集成电路是8脚封装，双列直插型，如图2(a)所示，按输入输出的排列可看成如图2(b)所示。其中6脚称阈值端(th)，是上比较器的输入；2脚称触发端(tr)，是下比较器的输入；3脚是输出端(vo)，它有o和1两种状态，由输入端所加的电平决定；7脚是放电端(dis)，它是内部放电管的输出，有悬空和接地两种状态，也是由输入端的状态决定；4脚是复位端(mr)，加上低电平时可使输出为低电平；5脚是控制电压端(vc),可用它改变上下触发电平值；8脚是电源端，1脚是地端。 能产生有规律的脉冲电流或电压的电路叫振荡电路，时基集成电路555振荡电路就是能满足这种条件的电路；它于十进制集成电路计数器ic3、集成电双向模拟开关cd4066、rc微分电路、三极管、发光二极管组成的模拟礼花色彩的发光电路。它们之间通过振荡信号、脉冲信号、输出信号相互作用而导通点亮发光二极管。 目前，电子声光礼花器以小型、轻量和环保的特点被广泛应用于家庭庆典、朋友聚会、联欢晚会、儿童玩具及一些趣味性等场所，是当今电子信息产业飞速发展不可缺少的一种电子产品。目前市场上出售的电子声光礼花器中主要以围绕各类集成电路，集成芯片，高频振荡电路之间相互控制作用的高新电子技术，以单片机为基础来设计模拟礼花燃放。 附录2 英文参考资料small electronic sound and light fireworkssmall electronic sound and light fireworks is an analog fireworks discharge of the circuit, the main content of the work is luminous and simulation of analog fireworks color fireworks explosion sound audible, widely used in family celebrations, meet up with friends, party, childrens toys, and some interesting places such as the electronic product. small electronic sound and light fireworks essence is to issue a square-wave oscillation signal with an oscillation circuit triggered analog fireworks color light-emitting circuit and analog fireworks explosion sounder circuit manner, not only the application in the electronic sound and light fireworks circuit, in other also very common circuit applications, such as analog phone ringing circuit, simple hypnosis, dc motor speed control circuit doorbell circuit. small electronic sound and light fireworks ceremony fireworks compared with the environmental, safety, suitable for indoors, etc., is not the kind of feeling like a falling meteor shower when the ceremony fireworks discharge circuit complexity and difficult to repair. before talking about the small electronic sound and light fireworks, first familiarize yourself with the time-base integrated circuit 555 oscillation circuit 555 ic is a timer application, so called the 555 timer or 555. but later developed it in addition to timing delay control, can also be used for dimming, thermostats, pressure regulator, governor variety of control and measurement testing. in addition, it is also can be composed of the pulse oscillation, monostable, bistable, and the pulse modulation circuit for the ac signal source, power conversion, frequency conversion, pulse modulation. it is reliable, easy to use, inexpensive, is widely used in a variety of electronic products, dozens of components, ic 555 internal divider, comparator, basic rs flip-flop, the discharge tube, and buffer , etc., the circuit is more complex, is a mixture of analog circuits and digital circuits, as shown in figure 1. 555 ic 8-pin package, dual in-line type, shown in figure 2 (a) as shown by the arrangement of the input and output can be viewed as shown in figure 2 (b) shown. 6 feet, said threshold end (th), on the input of the comparator; 2 feet, said trigger end (tr) is the input of the comparator; 3 feet output end (vo), o and two states , from the input terminal of the added level determination; 7 feet is the discharge end (dis), it is the output of the internal discharge tube, the two states of the left floating, and the ground, is also determined by the state of the input; 4 feet is reset terminal (mr ), together with the low level of the output is low; 5 feet is to control voltage end (vc), it can be used to change the upper and lower trigger level value; 8-pin power supply terminal, pin 1 is the ground terminal. can produce a regular pulse current or voltage of the circuit is called an oscillation circuit, time base integrated circuit 555 the oscillation circuit is able to meet this condition of the circuit; in decimal ic counter ic3 bidirectional analog switch integrated circuit cd4066, and rc differentiating circuit, transistor, the light emitting diode composed of analog fireworks color light emitting circuit. between them through the interaction of the oscillation signal, a pulse signal, the output signal conduction to light emitting diode.small, lightweight and environmentally friendly features, electronic sound and light fireworks are widely used in family celebrations, gatherings of friends, gala, childrens toys and some interesting places, todays electronic information industry, the rapid development of an indispensable electronic products. sale on the market of