Lesson Plan for Making a Speaker Laboratory
©1995 The Regents of the University of California by Regan Lum Introduction: A speaker is a device that converts an electronic signal into sound. figure 1 Purpose: In this laboratory, you will explore how a speaker works. Materials: 1 permanent magnet 2 feet of wire 1 pencil tape or glue 1 Styrofoam or paper cup 1 signal source (tape player) 1 plug with alligator clips for tape player Procedure: Assemble material as shown in figure 1. Leaving about 10 centimeters on the end, wrap the wire around a pencil to make a wire coil and tape or glue it to the bottom of the cup. Conclusion Does the volume control on the tape player work on your speaker? Return to CEA Science Education Home Page
How To Use a Compass - when you have no compass....
Kjetil Kjernsmo's illustrated guide on Finding the directions without a compass You are lost. I mean really lost. Further thoughts about extreme survival skills is beyond the scope of this page, seek advice elsewhere beyond this introduction. This page is mainly about the northern hemisphere of the earth, actually north of 23.5 °, because I have never been to the southern hemisphere myself (would like to go there of course!). For a start, it may be a good idea to climb a hill, and get a good look around. Let us start with the most accurate method. In the morning, at least before noon, the trick starts. Now, the line from the first stick to the second is west-east, like on the figure. There is a short, fast version of this one as well. In the northern hemisphere, there is a star that is almost exactly in the north at all times, the Polaris. In the southern hemisphere, you would have to find the Southern Cross. If you have an analog wrist watch, you can use the time to find north.
25 clever ideas to make life easier
Via: amy-newnostalgia.blogspot.com Why didn’t I think of that?! We guarantee you’ll be uttering those words more than once at these ingenious little tips, tricks and ideas that solve everyday problems … some you never knew you had! (Above: hull strawberries easily using a straw). Via: apartmenttherapy.com Rubbing a walnut over scratches in your furniture will disguise dings and scrapes. Via: unplggd.com Remove crayon masterpieces from your TV or computer screen with WD40 (also works on walls). Via: athomewithrealfood.blogspot.com Stop cut apples browning in your child’s lunch box by securing with a rubber band. Via: marthastewart.com Overhaul your linen cupboard – store bedlinen sets inside one of their own pillowcases and there will be no more hunting through piles for a match. Via: realsimple.com Pump up the volume by placing your iPhone / iPod in a bowl – the concave shape amplifies the music. Via: savvyhousekeeping.com Re-use a wet-wipes container to store plastic bags. Via: iheartnaptime.net
Top 10 DIY Tech Gifts
@keyboard-vomit: Yeah, but wouldn't it be awesome if some of our not so tech friends actually attempted (and accomplished) one or more of these feats? I mean, when "it's the thought that counts," shouldn't it be a thought about something we'd actually appreciate. Then again, maybe socks are your thing. ;) @HunterShoptaw: That they are, I'm wanting some socks with an integrated HDD, and some USB connectivity. @HunterShoptaw: The thought does count, but it sure would be nice if they enjoyed the gift too. Last year, I circumnavigated the 2nd biggest mall in the country (King of Prussia) with a buddy of mine, and we both came up with squat for our wives. So for this year, I created wishgenies dot com for people who WANT to give good gifts, but don't know what they'll want. @keyboard-vomit: I swear that some day, some how...Google will be able to find my lost socks.
History - Podcasts Downloads
Get Abs in Weeks with this Yoga Workout
Eight yoga exercises to tighten your torso, trim belly fat, and create eye-popping abs By John Hanc 1 of 13 1. Lie flat on your back, legs extended, feet flexed, and arms at your sides, palms facing down.
How to Make a Three-Pendulum Rotary Harmonograph
A harmonograph is a mechanical device that uses swinging pendulums to draw pictures, believed to be originally invented in 1844 by Scottish mathematician Hugh Blackburn. This 3-pendulum rotary type of harmonograph gives a wide variety of pleasant results, and is fairly easy to build once you've settled on a design and have acquired the appropriate materials and tools. This is a great project to do with kids and can result in endless experiments creating new types of geometric designs. Skip to More Results and Movie Two lateral pendulums swing back and forth at right angles to each other with arms connecting to a pen.
create your personal landing page & contact hub
pixelhub By signing in you accept our privacy & legal notice. Please enter the email address you signed up with. We'll send you an email with further instructions (please also check your spam folder). Tell your friends: DooID user? pixelhubHomeWhat is .Pixelhub? © dooid 2014 | generating site … takes less than 5 minutes easy content publishing automated social media updates Easily build a beautiful website. Your website. What is .Pixelhub? Pixelhub is a plug 'n play website builder that allows you to create a crisp, stylish website that is super-easy to edit and almost impossible to mess up. "Pixelhub is different from other website creation applications because the platform encourages its users to build websites that are a reflection of their inner personalities." - Appvita.com Featured in: Check out some Personal Websites built with .Pixelhub: pixelhub.me/pablopugaPhotographer & Designer, Mexico City, MX pixelhub.me/bogdanadrArchitect & Designer, Poznan, Poland .Pixelhub Basic is 100% free. free $6/mo
How Verbal Self-Defense Works"
Lots of people think verbal self-defense means fighting back. Their image of verbal self-defense is a collection of killer smart cracks plus strategies for using language to wipe the floor with their opponents. It's not an accurate image. In this edition of How Stuff Works, I'd like to show you a different way to relate to other people, especially when you disagree. Why Verbal Self-Defense? It has undoubtedly happened to you. This isn't trivial. Obviously it's to your advantage to stay out of arguments in both your personal and your professional life, unless something truly important -- something about which you care profoundly -- is at stake. The answer is pretty simple, and it's a relic of the days when humankind dealt with sabertooth tigers at close range on a regular basis. This part of your brain can still be a good thing on those very rare occasions when you do face imminent life-threatening sudden peril from tornadoes or terrorists or mad gun-toters.
Top 10 Things You Can Upgrade with a Little Electronics Hacking
it is a skill to do a good solder joint, it comes with LOTS of practice. so most people who rarely do it will ever get good at it. Bingo. Of course, part of the issue is having a soldering iron at the right temp with a properly tinned tip. I don't expect to ever master tricky stuff like smts or even multilayer pcbs so I'm not much better then a newbie, anyway - and I totally suck at sweating pipe joints. Ah, well... SMT is actually a bit better than through-hole once you get the hang of it.
