基于压电陶瓷的蜂鸣器电路设计.pdf

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压电陶瓷是一种具有压电效应的高灵敏度、微功耗电声器件。首先介绍压电陶瓷蜂鸣器的技术特性,然后重点阐述数字多用表蜂鸣器电路的设计,包括适配ICL7106 型3位单片A / D 转换器、ICL7129 型4位单片A/ D转换器的两种蜂鸣器电路的设计。   目前, 在现代电子技术、传感技术、电声技术及家用电器领域中普遍使用了压电陶瓷。压电陶瓷材料具有压电系数高、耐潮湿、耐高温、烧制方便、成本低廉等优点。由它构成的压电蜂鸣器是一种高效率电声器件, 可制成数字仪器仪表用蜂鸣器 BZ( buzzer) 、扬声器、耳机、传声器( 即话筒) , 电话中的送话器和受话器等。  
18 红色 LED R1 R2 A32 R s Im 2.7k 2M VT E9013 U CD401 I 220k C R 20 BZ 2M COM 图3带声、光指示的蜂呜器电路 Fig3 Circuit of buzzer w ith sound and light indication R2,R4 2.2 ICL7129 A/D 50g1009 3 LED (BTS), ICL 71 29 A/D LCD ICL7129 BTS CMOSED 0.005% 10uV ED 110dB 1.35.2Hz R R 2.2M ReF+ C()\T R R 470k C.7【29 R 20 BZ COMO COM 图4适配ICL7129的蜂呜器电路 Fig 4 Circuit of adapted icl7129's buzzer UIn< 200 mV CONT 4 CD4011 BZ IC L 129 200 RX> CON T 2009CONT=0 CD4011 CONT 200 CD4011 CD4011 Q201994-2012 China AdRx1200 9 nal Electronic PubRshing House. All rights reserved. h48: //ww.c 18 LDI 1999 The process of the study of funct ionally gradient m aterials WANG Hui, YU Dong mei ( Colle M echa nical and Electrical Engineerin Hebei University of Science and Technology, Shijia zhuang Hebei 050054, China) Abstract: T his paper presents w it h the co ncept of FG M and some important questions in this field. a dditionally the dev elopment and application pro spects of FGM are anticipated Key words: funct ionally gradient materials; compo site mat eria l; thermal st ress; material design; preparat ion echniques 32) R2200 [M] R2 c2 [MI the cir cuit design of digital multi-meter buzzer SHa Juan, WEI Feng Departm ent of Control Science and Engineering, Huazhong U niversity of Science and Techno logy, Wuhan Hubei 430074, China, Abstract: Piezo electric ceramic is a highly sensitive, micro pow er consumption electro acoustic device w ith piezoelect ric effect. T his paper st arts w ith the introduct ion follow ed by t he circuit design of digital multimeter buzzer, including two buzzer cricuit desig ns adapt ed 3 A/D converter ICL 7106, and 4 A/D converter ICL7129 Key words: buzzer; ceramic; piezo electric effect; DMM Discussion on the security of electronic Commerce MA Hong -xia bian Chun. cao shu-fu' (1. College of Information Science Eng ineer ing, Hebei U niversity of Science and Techno lo gy, Shijiazhuang Hebei 050054, China; 2. Shijiazhuang Cig aret te Fact ory, Shijiazhuang Hebei 050051, China; 3. Heibei electronic ndustrial Scho ol, Shijiazhuang Hebei 050061, China) Abstract: T his paper introduces the technical mechanism and inter nat ion al standard of secure electro nic commerce and describes and discusses the major techniques of the secure mechanism in great detail Key words: electronic comm erce; secure mechanism; encry pt o1994-2012ChinaAcademicJournalElectronicPublishingHouse.Allrightsreservedhttp:/www.c

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