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cheng
滤波器广泛应用于数字信号处理、通信、自动控制领域,但设计可变宽频带有源滤波器则比较困难。利用单片机控制参数可编程的双二阶通用开关电容有源滤波器,精确设置有源滤波器的中心频率f，品质因数Q及有源滤波器的工作方式。本系统主要分为两个部分:即程控滤波器和程控放大器。程控放大器电压增益为40dB，通过单片机控制DA进行分压，可精确实现要求的10dB步进，误差小于0.5 ，通带为100Hz-500KHz，输入电压峰－峰值范围为10mV，在输入范围内无明显失真。由MAX264为核心的滤波器，可设置为高通、低通滤波器。通过单片机直接给出控制频率，使-3dB截止频率在1KHz-20KHz内可调，步进1KHz，误差小于1 。整个系统以52单片机为控制核心，电路简单，性能稳定，且具有较高精度，滤波参数调节通过单片机控制，较为方便。(Filters are widely used in digital signal processing, communications, automatic control area, but the design variable wideband active filter is more difficult. Control parameters using single-chip programmable universal switched-capacitor biquad active filter, active filter accurately set the center frequency f, quality factor Q and the active filter works. The system is mainly divided into two parts: the program-controlled filters and programmable amplifiers. Programmable amplifier voltage gain of 40dB, the DA through the partial pressure of single-chip control, can accurately achieve the required 10dB step, the error is less than 0.5 , passband to 100Hz-500KHz, input voltage peak- the range of 10mV, the input range no significant distortion. By the MAX264 as the core of filter can be set to high pass, low pass filter. Given directly by the microcontroller controls the frequency, the-3dB cutoff frequency at 1KHz-20KHz adjustable, step 1KHz, error is less than 1 . The entire system for)
- 2011-07-17 16:23:27下载
- 积分：1
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IDC3516
IDC3516-4-20mA电流环隔离接口芯片的应用(IDC3516-4-20mA current loop isolation Application Interface Chip)
- 2006-10-22 15:28:42下载
- 积分：1
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linliangyu
基于AT89C2051的，完整的电子时钟显示，带有多个闹钟的设置，不同闹钟时刻可以播放不同的歌曲，(Based on AT89C2051, complete electronic clock with multiple alarm clock settings, different alarm time can play different songs,)
- 2012-09-23 13:00:15下载
- 积分：1
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Electronic-cipher-lock
实现一基于单片机的电子密码锁的设计,电子密码锁的设计主要由三部分组成：矩阵键盘接口电路、密码锁的控制电路、最小系统。另外系统还有LED提示灯，报警蜂鸣器等。(Realization of a microcontroller based electronic password lock design, the design of electronic password lock consists of three parts: matrix keyboard interface circuit, password lock control circuit, the minimum system. In addition, the system also has LED tips, alarm buzzer, etc..)
- 2016-11-08 15:51:11下载
- 积分：1
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The-infrared-car-tracking
红外小车壁障程序，通过红外发射和接收模块传送回来的数字信号编程，使小车能够沿着黑线行走(Through infrared send back digital signal transmitting and receiving module programming, make the car can walk along the black line)
- 2014-10-25 21:19:07下载
- 积分：1
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LM3S8962_Datasheet_CN
cortex m3系列，LM3S8962中文资料。是初学M3的好助手(cortex m3 datasheet of chinese.)
- 2011-02-16 13:12:18下载
- 积分：1
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project
使用51系列单片机（AT89S52）控制LCD（12864）,全菜单化操作控制初始时间输入，并以指针+数字形式或纯数字形式显示当前时间（年月日周时分秒）及温度（±XXX.XXXX），工程需要环境为keil Uvision2，其中包含以下各模块的C语言驱动程序：x5045,8255c,ATM12864,ds1302,ds1820,8键键盘(74LS164控制)(The use of 51 series single-chip microcomputer (AT89S52) control LCD (12864), the entire menu of operational control of the initial time input, and to guide+ Digital form or pure digital form displays the current time (day of week, minutes and seconds) and temperature ( ± XXX.XXXX), works for the needs of the environment keil Uvision2, which includes the following modules of the C language driver: x5045, 8255c, ATM12864, ds1302, ds1820, 8 keys keyboard (74LS164 control))
- 2020-06-26 03:20:02下载
- 积分：1
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IIC
此程序为CRT显示器的IIC总线的驱动，主芯片为MYSON公司的MTV212MN64(This procedure for the CRT display IIC bus driver, the main chip for Myson' s MTV212MN64)
- 2009-02-03 15:57:17下载
- 积分：1
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WK2124_irq(STM32)
说明： WK2124,STM32 spi通讯，中断方式 c语言程序(WK2124 STM32 spi IRQ c test)
- 2020-06-19 22:40:01下载
- 积分：1
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DMX512-kongzhiqi
DMX512舞台灯控制器，本次控制器采用新唐单片机，标准DMX512协议，控制有内控和外控功能。(DMX512 stage lighting controller, this controller uses Nuvoton microcontroller, standard DMX512 protocol, there are internal control and external control functions.)
- 2021-04-27 11:48:44下载
- 积分：1
