简易卡拉OK话筒

简易卡拉OK话筒 电子学院开放实验室项目申请 目:简易卡拉OK话筒 班 级: B1031 姓 名: 学 号: 5 专 业: 电气自动化 实 验 室: 开放实验室 设计时间: 2011 年11月 14 日 —— 2011 年11月20日 审批意见: 指导教师: principles and policies, political stand, thinking to identify directions, operational orders. (D) strengthening the party construction of party spirit. Spirit is a measure of party positions and the basic principle of the enlightenment. Each party to important life accomplishment, as required, for profound self education, exercise, self improvement and self improvement, thick "background of party membersparty's line, principles and policies play a key political role in implementation. Four-line to firmly establish consciousness. Unswervingly followed the pace of XI Jinping, Secretary, par often awake and active par consciously and resolutely the same courage, par to the CPC Central Committee, General Secretary of the party Constitution and practices series of spirit par, par to the party's theory, line 1. 设计方案 利用LM386芯片做一个话筒，使普通的双卡收录机也具有卡拉,,功能。 2. 基本原理 LM386是一种音频集成功放，具有自身功耗低、电压增益可调整、电源电压范围大、外接元件少和总谐波失真小等优点的功率放大器，广泛应用于录音机和收音机之中。LM386是美国国家半导体公司生产的音频功率放大器,主要应用于低电压消费类产品。为使外围元件最少,电压增益内置为20。但在1脚和8脚之间增加一只外接电阻和电容,便可将电压增益调为任意值,直至 200。输入端以地位参考,同时输出端被自动偏置到电源电压的一半,在6V电源电压下,它的静态功耗仅为24mW,使得LM386特别适用于电池供电的场合。 卡拉OK话筒电路如图3-6所示。IC是小功率功耗集成电路，它的外围电路十分简单，无需调试能正常工作。话筒MIC感受到歌声信号后，经C1、RT加到IC的3脚，经功率放大后由5脚输出。通过C3加到电感线圈L两端，L即向周围空间辐射低频交变磁场。 使用时，将L放入双卡收录机中的一个卡座内，使L靠近卡内的磁头，按下该卡放音键，这是口对话筒MIC歌唱，收录机就会播放出你的歌声。如在另一个卡主放入一个卡拉OK伴唱磁带，再按下该卡的放音键，你就可以根据伴唱音乐放声歌唱了。 principles and policies, political stand, thinking to identify directions, operational orders. (D) strengthening the party construction of party spirit. Spirit is a measure of party positions and the basic principle of the enlightenment. Each party to important life accomplishment, as required, for profound self education, exercise, self improvement and self improvement, thick "background of party membersparty's line, principles and policies play a key political role in implementation. Four-line to firmly establish consciousness. Unswervingly followed the pace of XI Jinping, Secretary, par often awake and active par consciously and resolutely the same courage, par to the CPC Central Committee, General Secretary of the party Constitution and practices series of spirit par, par to the party's theory, line 3.电路图 principles and policies, political stand, thinking to identify directions, operational orders. (D) strengthening the party construction of party spirit. Spirit is a measure of party positions and the basic principle of the enlightenment. Each party to important life accomplishment, as required, for profound self education, exercise, self improvement and self improvement, thick "background of party membersparty's line, principles and policies play a key political role in implementation. Four-line to firmly establish consciousness. Unswervingly followed the pace of XI Jinping, Secretary, par often awake and active par consciously and resolutely the same courage, par to the CPC Central Committee, General Secretary of the party Constitution and practices series of spirit par, par to the party's theory, line 3.元器件清单列 名称 规格 个数 电阻 3K 1 电位器 47K 1 电感线圈 1 LM386芯片 4*2 1 芯片座 4*2 1 咪头 1 电容器 10uF两个、47uF和100uF各一个 3 principles and policies, political stand, thinking to identify directions, operational orders. (D) strengthening the party construction of party spirit. Spirit is a measure of party positions and the basic principle of the enlightenment. Each party to important life accomplishment, as required, for profound self education, exercise, self improvement and self improvement, thick "background of party membersparty's line, principles and policies play a key political role in implementation. Four-line to firmly establish consciousness. Unswervingly followed the pace of XI Jinping, Secretary, par often awake and active par consciously and resolutely the same courage, par to the CPC Central Committee, General Secretary of the party Constitution and practices series of spirit par, par to the party's theory, line