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变频器控制电路，内有详细PCB板。经测试，性能正常，能直接使用。( Inverter control circuit, which has a detailed PCB board. After testing, the performance of normal, can be used directly.)

Asp.net试题素材管理系统源码 一个多用户在线题库管理系统,可以实现各类试题的添加和管理，可以实现管理员、老师和学生的三级管理 用户管理：管理员、老师、学生信息的添加和管理 科目管理：考试科目的管理 章节管理：科目中的章节管理 试题管理：可以选择科目和章节，题型（填空题、是非题、名词解释题、简答题等）、难度选项 默认管理帐号密码均为admin 默认学生登陆帐号密码均为student 系统实现三层架构开发（内附开发文档），利用了Asp.net2.0中的master、skin、gridview等控件，采用Sql2005数据库(DB下为数据库文件，附加即可)(very good)

Stm32F4XX platform voice synthesizer

巧用C8051F410的PCA实现超声波测距(Using the PCA to achieve ultrasonic ranging C8051F410)

编码器程序能测编码的角度和角速度并反馈回去(The coding of program encoder Angle and angular velocity and feedback is back )

十分详细的介绍了1602的功能和图片，能够让初学者容易掌握(Very detailed introduction to the 1602 features and pictures, so beginners can easily grasp)

这个是11V11的平台，里面有简单的策略，代码都经过了注释，非常适合初学者学习。(This is the 11V11 platform, which has a simple strategy, the code have been annotated, very suitable for beginners to learn.)

会员消费积分管理系统 使用ASP.NET技术实现简单的会员消费积分管理功能，使用SQL Server 2008作为后台数据库。功能包括：首页、积分查询、会员管理、修改密码和退出等。本次只要求实现首页和会员管理功能。程序运行界面如图-1至图-5所示。(Member Consumer Credit Management System)

国外知名的在线购物的网站源码，asp.net3.5,安装过程中可以一并将数据库进行安装(nopCommerce is a fully customizable shopping cart. It s stable and highly usable. nopCommerce is an open source e-commerce solution that is ASP.NET 3.5 based with a MS SQL 2005 (or higher) backend database. Our easy-to-use shopping cart solution is uniquely suited for merchants that have outgrown existing systems, and may be hosted with your current web host or our hosting partners. It has everything you need to get started in selling physical and digital goods over the internet.)

As the figure above illustrates, a phase accumulator compares the sample clock and desired frequency to increment a phase register. Again, the fundamental idea is that we can generate signals with precise frequencies by generating an appropriate sample based on the phase of that frequency at any point in time. In addition, by representing our waveform with 214 (16,384) points, we are able to represent exactly 16,384 phase increments with our lookup table.