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• 数字广播接收(Digital Radio Reception)　2008-12-30 09:46
  Build a Longwave AM Radio Receiver Follow Krzysztof as he constructs a digital direct-conversion receiver for long waves. Tuning is controlled by a USB serial connection with a computer running terminal-emulating software. The LM3S811-based system proves you can build a radio receiver with a few discrete components. I always wanted to build a radio receiver that could be digitally tuned， without knobs or variable capacitors， just a link to a computer. It would be a software-defined radio that ...
  

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• 虚拟音频控制(Virtual Audio Control)　2008-12-24 10:08
  Build a Virtual Instrument Interface The Real Virtual Instrument Interface design controls any musical instrument with a MIDI input and captures its audio output over the Internet. The streaming media device interfaces to virtual music studio software and can also simply record audio if you don‘t need MIDI. During the last decade， computers have become important instruments for musicians. They are used for sound recording， sound generation， and music production. In addition， the all-importa...
  

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• 微控制器时钟锁定（Microcontroller Clock-Locking）　2008-12-22 22:24
  Frequency Reference Synchronization Michael built an accurate frequency reference synchronized to a GPS clock. The frequency counter can count to 50 MHz with 1-Hz accuracy. You can also use it to generate GPS-locked output signals as a frequency reference or as a component in a radio receiver. The device can display GPS information such as time， location， and velocity. An old aphorism goes， "Give a man a clock and he knows what time it is. Give a man two clocks and he is never sure." However，...
  

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• 控制组件（Component Control）　2008-12-03 12:21
  A Tool for Finding and Handling Small Parts It‘s time to take control of your components.You can identify tiny surface-mount parts with a handheld LCR meter. The lightweight tool automatically determines the type of component，inductor， capacitor， or resistor （LCR）， and selects the proper range and signal frequency for the most accurate measurement. The component type， measurement results， and test conditions used to determine the results are displayed on a dot-matrix display. If your wo...
  

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• 脱离算法的PID控制（PID Control Without Math）　2008-12-01 12:44
  If you need to design an optimized control loop for a hardware control problem， consider trying a proportional integral derivative （PID） controller. In this article， Robert explains that PID regulations are simple to code， wire， and tune to find the results you‘re looking for. Welcome back to the Darker Side. The vast majority of real-world systems are based around feedback loops， which are used to manipulate the inputs to a system to obtain a desired effect on its outputs in a controlle...
  

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