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In January, I had the fortune of being a keynote speaker at LCA2013 . One of the tchotchkes I received from the conference organizers was a little USB memory stick. I thought it was a neat coincidence that I was in a factory that manufactured exactly such memory sticks about a week before the conference.
Design, simulate, and program electronics.
Last Updated on Monday, 10 December 2012 10:01 Written by AcousticsFREQ Thursday, 13 October 2011 08:41 Make Cheap, Easy, Attractive DIY Sound Absorption Wall Panels Sound absorption panels trap acoustical energy (sound) and prevent it from reflecting off of the surfaces they cover. The panels are used to eliminate echoes and reflections that muddle or color amplified music and speech. These wall panels will also reduce reverberation levels in a room, which can sometimes provide ambient noise reduction
With the holiday season approaching, we are always looking for a way to add a little Christmas spirit to our office. This year, we thought it would be awesome to have a musical instrument that we could control with a NerdKits microcontroller kit , and have it play holiday music. Keeping true with the NerdKits spirit, we decided to build a xylophone, build the whole thing from scratch, and teach about solenoids and shift registers along the way! Our homemade xylophone was a great way to put our milling machine to use cutting the bars for each note, and using the lathe for the solenoid forms and steel slugs.
V2.01 18-Mar-03 1. What is a solenoid?
The Hydrocrystallophone is a novel music instrument invented by Attoparsec. Also called the Glissando, or Gliss, or the Mechanical Theramin, it is a new take on the old glass harp or glass armonica. Instead of offering multiple glasses tuned to different frequencies, it provides a single rotating glass. The tone this glass produces can be changed by means of the pipe which extends into it. This is attached to a pump cylinder, which can add or remove water as the glass is played. Glass rotation is achieved by means of a 1920s phonograph motor which was restored for this purpose.
Video of my PIC16F877A based MMC digital voice recorder: This is my first digital voice recorder which is made using a mid range PIC with a total RAM of only 256 bytes.
So, after lurking around in the shadows for years I've finally gotten round to making my first step-by-step instructable.
It's hard to convey in two pages what some people spend a lifetime learning, its been my experience that you have to be aware of some basics, the rest can be gleaned from the internet and looking at examples of specific problems.
The signals produced by most percussion sensors will require some processing before they're useful as triggers. Usually this means converting an oscillatory signal into a single unambiguous pulse that is appropriately scaled to carry the widest possible range of velocity information to the circuit being controlled. The circuitry in the diagram below performs this function.
Introduction The Behringer Control series are general purpose MIDI controllers. They are quite popular among users of digital mixing and synthesizer software. The firmware of these devices can be updated by sending special midi messages. This package contains the tools generate these midi messages from a firmware image and vice versa, and to upload them.
// Pin Definitions // Rows are connected to Digital
Decoupling by Example Bypassing currents in overdrive While enjoying the 7400 contest , it occurred to me that many of the submitted logic designs lacked some of the most elementary safeties to ensure a working result. One of the most disregarded aspects of the designs was the lack of bypass capacitors. Then, with an article about Murphy's law linking a Maxim application note , it was decided to write a bit about decoupling and bypass capacitors.
Before I start, I’d like to note that this is my first reverse engineering project. So the story here starts with me taking a class that required me to purchase one of these iClicker’s ( http://www.iclicker.com/Products/iclicker/ ), otherwise I wouldn’t get “participation” points in class :/ So I purchased one and booted it up during lecture to “participate”. It was neat to see some tech in the classroom, but the material wasn’t any more interesting, so I decided to tear this thing apart… I busted out my utilikey and tore it apart mid-lecture. At this point the professor noticed all the students were “participating” except me. She then walked up to my desk and noticed the iClicker completely torn apart and asked “What are you doing?” to which I responded “Opening this thing up..” and she responded with ”This is not apart of the lecture, you shouldn’t be doing this in class.
Introduction The Atmel AVR range of USB capable devices provides a wide-range of functionality and peripherals to the professional and hobbyist; however the additional complexity of both microcontroller firmware and host PC drivers is a tall barrier to anyone wishing to get started with USB development. Although the firmware is greatly simplified by freely available open-source USB stacks (such as LUFA) there is still the requirement for a base of AVR software, Windows software and physical hardware to support the application. The USB Generic HID Open Source Framework for Atmel AVR and Windows solves this issue by providing a ready-made framework on which to build your applications. The framework includes a reference hardware design, a reference firmware design and a Windows based DLL library and host-test application.