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Contraptor

Contraptor

DK LABORATORIES Dane.Kouttron [5.25.14] Submersible Thruster: 3 Phase Liquid Cooled Propulsion Design Requirements Bill of MaterialsPART II: Outer Shell, nose-cone & innner support bearing assemblyPART III: Bracing and Canoe quick-release mount Concluding Remarks: Stand on the shoulders of comrades, its suprising how much information there is out there on submersible assemblies. Details of testing the submersible thruster [Link] If you have questions or comments, ask below or send over an email. (be careful, im not responsible for your pricey mcmaster-carr order) CircuitHub Chispito How to Wind power is abundant, clean, inexpensive and easy to do. It is our belief that anyone can be in control of where his or her electricity comes from. There is nothing more rewarding and empowering than making a wind powered generator from scrap materials. Safety should be our highest priority. Materials This manual is based on using a 260 VDC, 5 A continuous duty Treadmill Motor with a 6 inch threaded hub. You may use any other simple permanent magnet DC motor that returns at least 1 V for every 25 rpm and can handle upwards of 10 amps. Mount 36" of 1" Square Tubing2" Floor Flange2" X 6" Nipple3 X 3/4" Self-tapping Screws NOTE: if you have access to a welder, you can weld a 6” section of 2” pipe onto your square tubing instead of using the flange, nipple and sheet metal screws. Motor 260 VDC, 5 A continuous duty Treadmill Motor with a 6 inch threaded hub30 - 50 Amp Blocking Diode (one-way)2 x 5/16” x ¾” Motor Bolts3" X 11" PVC Pipe Tail Blades Tools Step by Step Blades Sand Cut Tail Square Tubing

The Worlwide List of Open Source Hardware Online Stores Latest update: May 21st 2013. Thanks everyone for your comments! Don’t spend any more time browsing desperately the internetz to find parts for your RepRap, Arduino kits or local sensors and PCBs distributors for your new project. I put together this worldwide list of online stores selling open source hardware. There is a big chance your country is in it and that you will finally find your favourite local online store to get open source electronics, robotics, parts, kits, materials and supplies for your hardware projects. Leave a comment below the post if you own an online store that is not in the list or if you know a great online resource that should be in it. A world map made of old motherboards ©Susan Stockwell 2012. Detail of Susan Stockwell’s map. a2aPrinter: RepRap 3D printers ABRA Electronics Aztec MCU Prototyping BC-Robotics Canada Robotix Cana Kit Creatron Inc. DIIGIIT Robotics eckertech: RepRap parts and printers eWerksonline Lee’s Electronic MixShop Proto Advantage RobotShop RP Electronics

Batteries - Learn The battery pack is one of the defining aspects of any PEV project; by and large it determines the weight, range, and cost of the vehicle. For these reasons a solid understanding of the various battery types is more than a little useful. General Battery Types While there are a lot of chemical combinations that can and have been made into useful batteries, in practice there are only four rechargeable types readily available in sizes suitable for ebikes. For a long time, lead acid has been the defacto standard for EV's. Nickel Cadmium was the old standard for rechargeable consumer cells in the familiar AA, C, 9V series. Nickel Metal Hydride is quite similar to Nickel Cadmium, but with a higher energy density and a safer environmental record when disposed of in landfills. Almost all consumer electronics that have a plug-in charger these days are powered with lithium batteries because they can store about 3 times more energy than NiMH. Battery Chemistries Lead Acid Nickel Cadmium NiMH Voltage

Board Forge | Electronics – from art to part Hacked Gadgets – DIY Tech Blog deba168 from India designed and built this Arduino Solar Charge Controller to provide electrical power in areas where the grid can’t always provide power when needed. Code and schematics are provided so you can get some inspiration from the design. ”At first the charge controller will check the solar panel voltage and compare it with battery voltage ,If it is greater then the Arduino will starts sending pulse width modulation(PWM) signals to the mosfet(Q1) in order to charge the battery .When the solar panel voltage was below the battery voltage ,this pwm signals will not send by Arduino . Then next the micro controller will check the battery voltage ,if the battery voltage was below 6.96 v volts then the battery will be charged in boost mode ,that mean the battery will be charged with maximum amperage ,this boost mode of charging will be done by sending pulse width modulation signals with 95% duty cycle .

Dragon Innovation | We help entrepreneurs succeed.. Transcribing Piano Rolls, the Pythonic Way - __del__( self ) In this post I use Fourier transforms to revive a forgotten Gershwin piano piece. Piano rolls are these rolls of perforated paper that you put in the saloon’s mechanical piano. They have been very popular until the 1950s, and the piano roll repertory counts thousands of arrangements (some by greatest names of jazz) which have never been published in any other form. Here is Limehouse Nights (~1918), by a 20-years-old George Gershwin: It is cool, it is public domain music, and I want to play it. Fortunately, someone took a video of the same performance with a focus on the roll: In this post I show how to turn that video into playable sheet music with the help of a few lines of Python. Downloading the video You can download the video from Youtube using youtube-dl in a terminal: Step 1: Segmentation of the roll In each frame of the video we will focus on a well-located line of pixels: We can see that the holes are placed along columns. Step 2: Finding the pitch Step 3: Quantization of the notes

Makers calendar! | Events about open hardware and open digital fabrication, here and there If you know of an event feed you think belongs in this calendar, paste its iCalendar (.ics) feed’s URL below. If approved, its events will be added to this calendar. Get Your Own Calendar If you already have your own WordPress website, it’s easy to install your own All-in-One Event Calendar from Timely: Browse to time.ly/get-your-own-calendar. Download the free Standard Calendar plugin. That’s it! For help or for more information, please visit our Help Desk.

Products | WattsVIEW Power Monitor Datasheet / Owner’s Manual Owners Manual Typical Installation (In this case a solar combiner box) Open Design Engine Custom Electronics, Quality PWM Circuits, and DIY Science Projects - Research Media & Cybernetics

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