基于通用集成運算放大器，利用MASON公式設計了一個多功能二階通用濾波器，能同時或分別實現低通、高通和帶通濾波，也能設計成一個正交振蕩器。電路的極點頻率和品質因數能夠獨立、精確地調節。電路使用4個集成運放、2個電容和11個電阻，所有集成運放的反相端虛地。利用計算機仿真電路的通用濾波功能、極點頻率和品質因數的獨立控制和正交正弦振蕩，從而證明該濾波器正確有效。 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.
上傳時間： 2013-10-09
上傳用戶：13788529953
在Multisim 10軟件環境下，設計一種由運算放大器構成的精確可控矩形波信號發生器，結合系統電路原理圖重點闡述了各參數指標的實現與測試方法。通過改變RC電路的電容充、放電路徑和時間常數實現了占空比和頻率的調節，通過多路開關投入不同數值的電容實現了頻段的調節，通過電壓取樣和同相放大電路實現了輸出電壓幅值的調節并提高了電路的帶負載能力，可作為頻率和幅值可調的方波信號發生器。Multisim 10仿真分析及應用電路測試結果表明，電路性能指標達到了設計要求。 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.
上傳時間： 2014-01-21
上傳用戶：shen007yue
要生產音頻脈沖，只要算出某一音頻的周期(1/頻率)，可以利用定時器計時的方式得到此頻率的脈沖。而Arduino平臺“封裝”了新的數字輸出函數tone()。更簡易的實現喇叭和蜂鳴器唱歌。 tone(pin, frequency)，Arduino會向指定pin發送制定頻率的方波，執行noTone()函數來停止。 tone(pin, frequency, duration方法多了一個參數，代表發送方波持續的時間，到時自動停止發送信號，就不需要noTone()函數。 利用tone()函數播放音樂，只需要查表了解各個音符對應的頻率，還要求個人稍微能看懂音樂譜子的節拍。 物料清單 ： Arduino 328控制板 1塊 8Ω 0.5W的喇叭（或者蜂鳴器） 1個（ATmega328的驅動能力足夠，直接拉電流就ok!） 12Ω電阻(限流) 1個 實物圖：
上傳時間： 2013-10-14
上傳用戶：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.
上傳時間： 2013-10-12
上傳用戶：181992417
用途：測量地磁方向，測量物體靜止時候的方向，測量傳感器周圍磁力線的方向。注意，測量地磁時候容易受到周圍磁場影響，主芯片HMC5883 三軸磁阻傳感器特點（抄自網上）： 1，數字量輸出：I2C 數字量輸出接口，設計使用非常方便。 2，尺寸小: 3x3x0.9mm LCC 封裝，適合大規模量產使用。 3，精度高：1－2 度，內置12 位A/D,OFFSET, SET/RESET 電路，不會出現磁飽和現象，不會有累加誤差。 4，支持自動校準程序，簡化使用步驟，終端產品使用非常方便。 5，內置自測試電路，方便量產測試，無需增加額外昂貴的測試設備。 6，功耗低：供電電壓1.8V, 功耗睡眠模式-2.5uA 測量模式-0.6mA 連接方法： 只要連接VCC，GND，SDA，SDL 四條線。 Arduino GND -> HMC5883L GND Arduino 3.3V -> HMC5883L VCC Arduino A4 (SDA) -> HMC5883L SDA Arduino A5 (SCL) -> HMC5883L SCL (注意，接線是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); }
上傳時間： 2014-03-20
上傳用戶：tianyi223
socks5 remote exploit/ linux x86易受到的攻擊 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]該代碼本人是本人千辛萬苦利用俄漢翻譯軟件從俄羅斯網站上找到的，還沒有來得及實用，就發上來，與大家共研。有問題請Email:jzzq8081@sina.com
標簽： linux turbolinux compiled exploit
上傳時間： 2013-12-17
上傳用戶：xuanchangri
ZigBee™ 是專為低速率傳感器和控制網絡設計的無線網絡協議。有許多應用可從ZigBee 協議受益，其中可能的一些應用有：建筑自動化網絡、住宅安防系統、工業控制網絡、遠程抄表以及PC 外設。此程序包提供的是Zigbee協義棧函數庫源代碼，它實現了一個與物理層 無關的應用程序接口。 因此，無需做重大修改就可以輕松地在射頻（Radio Frequency，RF）收發器之間移植應用程序。
上傳時間： 2014-01-16
上傳用戶：Pzj
Random Number Generators（隨機數生成）包括gaussian random number generator、uniform random number generator、low-frequency hold generator、1/f noise generator等5種隨機信號生成的c源代碼
標簽： generator random number Generators
上傳時間： 2014-12-07
上傳用戶：edisonfather
頻率調制，It is a diffrent matlab code for frequency modulation.
上傳時間： 2015-05-30
上傳用戶：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
標簽： dimensione parameters amplitude response
上傳時間： 2013-12-19
上傳用戶：xfbs821
