Build A TENS Machine to Remove Pain A Tens machine is used to provide a drug free way of removing pain from your body ( TENS stands for Transcutaneous Electrical Nerve Stimulation ) .Here I will show you how to build your own Tens machine and reduce the amount of pills you use to stop pain .To Build this Tens unit, you will first need to buy a 555 timer IC . The 555 timer is very small about a quarter of the size of your finger nail .You can purchase one for about 25p from Maplins or Radio Shack etc . There are 2 types of Tens machine. High Frequency Tens uses frequencies in the range of 80 to 100 Hz. This blocks the pain impulses going to the brain .
DC-DC Bipolar Power Supply for Effect Pedals « Obsoletetechnology Certain circuits require a bipolar power supply. In a portable unit like an effect pedal, that can sometimes be troublesome, since it is likely that we want to power our effects with a standard 9V or 12V wall-wart or batteries and really don’t like the idea of putting an AC mains transformer plus rectifiers and filtering into our boxes. A good way getting around this problem is by using a step-up converter, also called DC-DC converter. A DC-DC converter converts a voltage level into another voltage level by temporaryly storing the energy in a capacitor or an inductor and then releasing the energy to the output thus multiplying the output voltage. I have used the LT3467 converter in a 9V input to +-15V output configuration.
AC Light Dimmer - Andrew Jessop March 2006 This project came about because a friend of mine had something similar as a component for his final year electronic engineering project. We decided that we would have a kind of competition to see who could build an AVR based AC light dimmer the quickest. I was interested because I had always wanted to experiment with AC power control, and this was the perfect, simple little project. AC Dimming Theory Hijack Introduction HiJack is a hardware/software platform for creating cubic-inch sensor peripherals for the mobile phone. HiJack devices harvest power and use bandwidth from the mobile phone's headset interface. The HiJack platform enables a new class of small and cheap phone-centric sensor peripherals that support plug-and-play operation. HiJack has been tested with the iPhone 3G/3GS/4G, iPod Touch, and iPad devices. A Hijack app LIB is also available to help you design your own particular "ixxxx" app with this kit.
Brewbot Mk2: STM32 LCD touch screen demo [Update: Torrent available for downloading the Virtualbox image ] You see many hobby projects use the good old 16x2 LCD. Pretty easy to use. But limiting. No graphics. Limited text. Electronics Since my V-USB tutorials became popular, a recurring theme in the comments section have been people who are obviously motivated to try out the tutorial, but due to limited exposure to C language and command-line are either having trouble following my short instructions to compile the example .hex files, or being scared of the command-line, have tried to use AVR Studio instead, and fail. I have to admit that first I was a bit annoyed by these people – why are they trying to follow a challenging project, when they seemingly have no understanding of how command line, makefiles, C compiler and linking process works? Then, comment by comment, I finally realized that not everyone started coding in the nineties where you launched Windows 3.11 mostly to play Solitaire, and biggest thing in coding productivity was 80×50 text mode which allowed you to have 16-color hacking bliss in your Borland Turbo C++ 3.0 IDE (or RHIDE, after DJGPP came around).
OLED panel could switch between sunroof and light source A sample of the OLED roof panel material, that can switch between being transparent and emitting light Image Gallery (2 images) What if your car had roof panels that let you see the sky during the day, but that lit the interior of the vehicle at night? Arduino Eclipse Development Environment for Mac OS X This is a short guide on how to setup Eclipse for Mac OS X Lion (10.7) for use with Arduino in a relatively short amount of time. Using this guide, Eclipse can be setup to program and download code onto Arduino microcontrollers in about 15 minutes by using the Arduino Eclipse Plugin. Initial Steps