2KW DIY Solar panels made of pop cans for home solar heating At the end, the solar absorber is painted black and placed in the diy solar panels casing. The casing is covered with plexiglass that we attach to the frame and thoroughly corked with silicone. Polycarbonate / plexiglass is slightly convex in order to gain greater strength. Concrete Lightbulb Wall Hook This is how to make an excellent excuse for driving a lag bolt into your wall, the Concrete Lightbulb Wall Hook. Functional yet sylish, it gives a nice industrial design feel wherever you mount it. Last winter after breaking out the serious cold weather gear, I found myself fighting the coat rack next to the front door. It was, to put it bluntly, failing miserably. Tipping over, breaking off, it was a mess.
johngineer The purpose of this post is to lay out some of the stuff I wish someone had explained to me when I was first learning about electronics. This is a pretty entry-level introduction, intended by me to ‘fill in the gaps’ with regard to basic operating principles. Opamps are not all that complicated, but for many people they appear as a black box. With so many schematics available online, it can be very tempting to simply ‘cut-and-paste’ subcircuits into your own designs without understanding them. This is okay to a point, and useful for learning, but it may come back to bite you later if your design doesn’t work the way you expect it to. First, let’s look at the schematic symbol for an op-amp and identify the pins and their functions.
Snap-together Sphere by aubenc A simple sphere made from three interlocked rings I made one day to show the whole process to a friend. The dimensions of the rings in the provided stl files are 60mm outer diameter, 20mm height and 3mm thickness. They have been generated with one face at every 2mm of the perimeter and also, a gap of 0.4mm in the slots which gave a nice fit for the rings printed by bot1334. The zip file contains two more examples (40mm diameter, 5mm and 10mm height and, if I'm not wrong, 2mm thickness) however, I was not using any "gap" parameter for those so... they'll need some cleaning to fit properly. Some more pics: UPDATE: Replaced the OpenSCAD file with v3 version which fixes a bug in the tolerances between rings.
How I built an electricity producing Solar Panel Several years ago I bought some remote property in Arizona. I am an astronomer and wanted a place to practice my hobby far away from the sky-wrecking light pollution found near cities of any real size. In my attempt to escape city slicker yuppies (you know the kind, the ones that like to blab loudly on their cell phone while they work on some business administration degree in a cyber cafe somewhere in Trendyland.) and their light pollution, I found a great piece of remote property. The problem is, it's so remote that there is no electric service available.
Ignite! You're done! Due to the double-walled construction and the integral can bottoms, the stove is much stronger than an empty aluminum can and can be expected to last years if you want it to. The best fuel is methanol, which burns blue and ignites quickly. Absolute ethanol is expensive, but denatured alcohol isn't and works well. The photos are taken with Iso-HEET isopropanol, probably 91%, which is what I had on hand; it works but burns yellow and is less efficient as the combustion continues up the sides of the pot, uselessly for heating food or water. The stove is filled through the holes in the center, and primed by burning either a pool in the center or a little sloshed over the sides, which I find efficient.
HackerspaceWiki Hackerspaces are community-operated physical places, where people can meet and work on their projects. This website is for Anyone and Everyone who wants to share their hackerspace stories and questions with the global hackerspaces community. Regular Events Call-in - Call-ins provide an opportunity for existing hackerspaces to provide an update and highlight upcoming events, and new/planned hackerspaces can ask questions. First Sunday each month. Synchronous Hackathon - Hackerspaces worldwide use the internet to interact and hack for the weekend. Our Simple DIY Home Solar Power System Bringing some of the benefits of electrical power to our off-grid home has been a hit-or-miss affair. Over the years we’ve tried some very simple approaches to lighting and small battery recharging for our flashlights, such as hauling a 12 volt car battery to a small rural school about a half mile away every time it needed to be topped up. This was time consuming and inefficient. But we didn’t want to lose the feel of our simple home by bringing in a large generator and the jugs of gas needed to run it, and the prospect of setting up a wind turbine or solar array seemed expensive and a technological eyesore in a natural setting.
Five Favorite Re-Uses For Wooden Crates Previous image Next image Wine, re-purposing, and attractive storage solutions — these are a few of our favorite things. TGIF Book Marketing Tips: Everything You Do Online Reflects on Your Book Everything You Do Online Reflects on Your Book: Make Sure That Reflection Is Professional Guest Expert: Phyllis Zimbler Miller This month’s guest post is a natural extension of last month’s guest post “Do Your Offline and Online Book Promotion Activities Support Each Other?” In that post I talked about how your book author website should present consistent information about your offline and online book promotion activities.
9 Steps To Starting A Survival Garden In a time of economic uncertainty and rising food prices, it it always a good idea to have a garden to provide extra food for you and your family. Besides providing a source of food in an emergency, a garden is also a great source of wonderful vegetables which are MUCH healthier to eat than most of the food you can get at the supermarket. So how do you begin? Andi's Kitchen: At Long Last, Tile Renovation Diary Name:Andi ForkerType of Project: Kitchen Renovation — full gut remodelLocation: San Francisco, CaliforniaType of building: 1890's Victorian condo The Renovation Diaries are a new collaboration with our community in which we feature your step by step renovation progress and provide monetary support towards getting it done in style. See all of our Reno Diaries here. Our backsplash tile arrived this week. It took seven weeks for these little green gems to be hand-made at the Ann Sacks factory in Portland, Oregon.