基于通用集成运算放大器，利用MASON公式设计了一个多功能二阶通用滤波器，能同时或分别实现低通、高通和带通滤波，也能设计成一个正交振荡器。电路的极点频率和品质因数能够独立、精确地调节。电路使用4个集成运放、2个电容和11个电阻，所有集成运放的反相端虚地。利用计算机仿真电路的通用滤波功能、极点频率和品质因数的独立控制和正交正弦振荡，从而证明该滤波器正确有效。 Abstract: A new multifunctional second-order filter based on OPs was presented by MASON formula. Functions， such as high-pass， band-pass， low-pass filtering， can be realized respectively and simultaneously， and can become a quadrature oscillator by modifying resistance ratio. Its pole angular frequency and quality factor can be tuned accurately and independently. The circuit presented contains four OPs， two capacitors， and eleven resistances， and inverting input of all OPs is virtual ground. Its general filtering， the independent control of pole frequency and quality factor and quadrature sinusoidal oscillation were simulated by computer， and the result shows that the presented circuit is valid and effective.
上传时间： 2013-10-09
上传用户：13788529953
在Multisim 10软件环境下，设计一种由运算放大器构成的精确可控矩形波信号发生器，结合系统电路原理图重点阐述了各参数指标的实现与测试方法。通过改变RC电路的电容充、放电路径和时间常数实现了占空比和频率的调节，通过多路开关投入不同数值的电容实现了频段的调节，通过电压取样和同相放大电路实现了输出电压幅值的调节并提高了电路的带负载能力，可作为频率和幅值可调的方波信号发生器。Multisim 10仿真分析及应用电路测试结果表明，电路性能指标达到了设计要求。 Abstract: Based on Multisim 10， this paper designed a kind of rectangular-wave signal generator which could be controlled exactly composed of operational amplifier， the key point was how to implement and test the parameter indicators based on the circuit diagram. The duty and the frequency were adjusted by changing the time constant and the way of charging and discharging of the capacitor， the width of frequency was adjusted by using different capacitors provided with multiple switch， the amplitude of output voltage was adjusted by sampling voltage and using in-phase amplifier circuit，the ability of driving loads was raised， the circuit can be used as squarewave signal generator whose frequency and amplitude can be adjusted. The final simulation results of Multisim 10 and the tests of applicable circuit show that the performance indicators of the circuit meets the design requirements.
上传时间： 2014-01-21
上传用户：shen007yue
要生产音频脉冲，只要算出某一音频的周期(1/频率)，可以利用定时器计时的方式得到此频率的脉冲。而Arduino平台“封装”了新的数字输出函数tone()。更简易的实现喇叭和蜂鸣器唱歌。 tone(pin, frequency)，Arduino会向指定pin发送制定频率的方波，执行noTone()函数来停止。 tone(pin, frequency, duration方法多了一个参数，代表发送方波持续的时间，到时自动停止发送信号，就不需要noTone()函数。 利用tone()函数播放音乐，只需要查表了解各个音符对应的频率，还要求个人稍微能看懂音乐谱子的节拍。 物料清单 ： Arduino 328控制板 1块 8Ω 0.5W的喇叭（或者蜂鸣器） 1个（ATmega328的驱动能力足够，直接拉电流就ok!） 12Ω电阻(限流) 1个 实物图：
上传时间： 2013-10-14
上传用户：jiangxiansheng
This application note discusses a variety of approaches for interfacing analog signals to 5V powered systems. Synthesizing a "rail-to-rail" op amp and scaling techniques for A/D converters are covered. A voltage-to-frequency converter, applicable where high resolution is required, is also presented.
上传时间： 2013-10-12
上传用户：181992417
用途：测量地磁方向，测量物体静止时候的方向，测量传感器周围磁力线的方向。注意，测量地磁时候容易受到周围磁场影响，主芯片HMC5883 三轴磁阻传感器特点（抄自网上）： 1，数字量输出：I2C 数字量输出接口，设计使用非常方便。 2，尺寸小: 3x3x0.9mm LCC 封装，适合大规模量产使用。 3，精度高：1－2 度，内置12 位A/D,OFFSET, SET/RESET 电路，不会出现磁饱和现象，不会有累加误差。 4，支持自动校准程序，简化使用步骤，终端产品使用非常方便。 5，内置自测试电路，方便量产测试，无需增加额外昂贵的测试设备。 6，功耗低：供电电压1.8V, 功耗睡眠模式-2.5uA 测量模式-0.6mA 连接方法： 只要连接VCC，GND，SDA，SDL 四条线。 Arduino GND -> HMC5883L GND Arduino 3.3V -> HMC5883L VCC Arduino A4 (SDA) -> HMC5883L SDA Arduino A5 (SCL) -> HMC5883L SCL (注意，接线是A4，A5，不是D4,D5) 源程序： #include <Wire.h> #include <HMC5883L.h> HMC5883Lcompass; voidsetup() { Serial.begin(9600); Wire.begin(); compass = HMC5883L(); compass.SetScale(1.3); compass.SetMeasurementMode(Measurement_Continuous); } voidloop() { MagnetometerRaw raw = compass.ReadRawAxis(); MagnetometerScaled scaled = compass.ReadScaledAxis(); float xHeading = atan2(scaled.YAxis, scaled.XAxis); float yHeading = atan2(scaled.ZAxis, scaled.XAxis); float zHeading = atan2(scaled.ZAxis, scaled.YAxis); if(xHeading < 0) xHeading += 2*PI; if(xHeading > 2*PI) xHeading -= 2*PI; if(yHeading < 0) yHeading += 2*PI; if(yHeading > 2*PI) yHeading -= 2*PI; if(zHeading < 0) zHeading += 2*PI; if(zHeading > 2*PI) zHeading -= 2*PI; float xDegrees = xHeading * 180/M_PI; float yDegrees = yHeading * 180/M_PI; float zDegrees = zHeading * 180/M_PI; Serial.print(xDegrees); Serial.print(","); Serial.print(yDegrees); Serial.print(","); Serial.print(zDegrees); Serial.println(";"); delay(100); }
上传时间： 2014-03-20
上传用户：tianyi223
socks5 remote exploit/ linux x86易受到的攻击 linux:* socks5-v1.0r10 (compiled on a turbolinux 4.0.5) => 0* socks5-v1.0r9 (compiled on a turbolinux 4.0.5) => 0* socks5-v1.0r8 (compiled on a turbolinux 4.0.5) => 0* socks5-v1.0r10 (compiled on a redhat 6.0) => 400* socks5-s5watch-1.0r9-2 (redhat-contrib) => no?* socks5-0.17-1 (redhat 4.2) => no* socks5-1.0r10-5 (redhat-contrib) => no??* socks5-server-1.0r6-8TL (TurboContrib) => no??用法:* $ ./1080r [offset]该代码本人是本人千辛万苦利用俄汉翻译软件从俄罗斯网站上找到的，还没有来得及实用，就发上来，与大家共研。有问题请Email:jzzq8081@sina.com
标签： linux turbolinux compiled exploit
上传时间： 2013-12-17
上传用户：xuanchangri
ZigBee™ 是专为低速率传感器和控制网络设计的无线网络协议。有许多应用可从ZigBee 协议受益，其中可能的一些应用有：建筑自动化网络、住宅安防系统、工业控制网络、远程抄表以及PC 外设。此程序包提供的是Zigbee协义栈函数库源代码，它实现了一个与物理层 无关的应用程序接口。 因此，无需做重大修改就可以轻松地在射频（Radio Frequency，RF）收发器之间移植应用程序。
上传时间： 2014-01-16
上传用户：Pzj
Random Number Generators（随机数生成）包括gaussian random number generator、uniform random number generator、low-frequency hold generator、1/f noise generator等5种随机信号生成的c源代码
标签： generator random number Generators
上传时间： 2014-12-07
上传用户：edisonfather
频率调制，It is a diffrent matlab code for frequency modulation.
上传时间： 2015-05-30
上传用户：wanqunsheng
Routine mampres: To obtain amplitude response from h(exp(jw)). input parameters: h :n dimensioned complex array. the frequency response is stored in h(0) to h(n-1). n :the dimension of h and amp. fs :sampling frequency (Hz). iamp:If iamp=0: The Amplitude Res. amp(k)=abs(h(k)) If iamp=1: The Amplitude Res. amp(k)=20.*alog10(abs(h(k))). output parameters: amp :n dimensioned real array. the amplitude-frequency response is stored in amp(0) to amp(n-1). Note: this program will generate a data file "filename.dat" . in chapter 2
标签： dimensione parameters amplitude response
上传时间： 2013-12-19
上传用户：xfbs821
