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. Low frequency Tens uses frequencies from 2 to 4 Hz . Square waves are universally encountered in digital switching circuits and are naturally generated by binary (two-level) logic devices.
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. I have used the LT3467 converter in a 9V input to +-15V output configuration. I have tested my circuit and it works well up to 80mA of output current, which totals to 160mA for both positive and negative outputs. Setting Output Voltage To set the output voltage, select the values of R1 and R2 (see schematic) according to the following equation. Get the schematic, bom and gerbers here. Schematic: +-15V Power Supply with DC-DC Converter Board: Bipolar Power Supply DC-DC PCB The ready-made PCB: PCB for the bipolar power supply Populated PCB: Like this:
leaflabs.com Evil Mad Scientist Laboratories | Making the world a better place, one Evil Mad Scientist at a time. Open Design Engine 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. Model: TES52959P hijack project The Hijack kit includes: Hijack mainboard Hijack programmer HiJack ProtoBoard Grove-Universal 4 Pin cable X5 Bug Tracker Because of the connector we used in last batch can not be found in market, we have transferred to the original hijack version, which we found a fatal bug in the connector. How does Hijack works Power. Download the firmware The Hijack is shipped with a firmware downloaded into it's MCU. 1. 3. If you see the "xxxx bytes programmed" message, the firmware download is OK. Schematic Hijack mainboard.PDFProgrammer.PDFProtoBoard.PDF Cautions Specification May include key specifications and other specifications. Application
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. In a word: ugly. Most consumer devices these days include a graphical LCD and touch screen interface. So I started to get away from 16x2 LCDs in my projects. Fortunately 320x240 LCDs with touch screen and micro controller can be had cheaply on ebay. I have a some friends who have started using these boards or expressed interest in using them. Which boards? ebay auctions expire all the time, so it's hard to link to specific boards. Look for the ones that are clearly 2 boards - the LCD board on top. The first sort of board has a 2.4" LCD: The second has a 3.2" LCD: Both LCDs are the same resolution, but I prefer the 3.2", it's substantially bigger (and so buttons will be bigger for fingers to hit). However the board with the smaller LCDs have other goodies, like 16MB flash, speaker and RS232. Demo Getting started
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. AC Dimming Theory Explanation to go here. Hardware Software The code for this project was written in BASCOM AVR - a BASIC compiler for the AVR microcontrollers. References Silicon Chip