MAKE: Blog: BUGbase / BUGmodules - pricing and shipping BUGlabs announced their pricing and shipping schedule today - AVAILABILITY / PRE-ORDERS The BUGbase and BUGmodules will ship by Monday, March 17, 2008. We’ll begin taking pre-orders through our online store on Monday, January 21, 2008.PRICING / EARLY-ADOPTER DISCOUNT The BUGbase will retail for $349, and the BUGmodules will vary from $59 to $119. Phillip Torrone Editor at large – Make magazine. Related Engineering ToolBox Technical Library scitoys.com - Radio Building a simple crystal radio. A crystal radio is the distilled essence of a radio. It has very few parts, it needs no batteries or other power source, and it can be built in a short time out of things you can find around the house. The reason a crystal radio does not need any batteries is the amazing capabilities of the human ear. We are going to launch right into this chapter by building a working radio using parts that we buy at stores like Radio Shack or through mail order. Later we will learn more about radios by looking at even simpler versions that might not work as well as our first radio, but can show the important radio concepts more easily, because they have fewer parts. Then we will improve our radio, making it louder, making it receive more stations, and making it look real nice. Lastly, we will build each part of the radio from scratch, using things we find around the house. Our first radio For our first radio, we will need these parts: A sturdy plastic bottle. Del.icio.us
Working With Three-Phase Power: Introduction to Electricity MAKE: Blog: Parallax sensors @ Radio Shack Oh Nooo! A 404 Page! Looks like we can't find the page that you are looking for. Sorry about that. Let's see if we can make it up to you. First off, let's try searching for the content. If that doesn't work, why not try browsing from popular categories? Read Digital Edition Shop Maker Shed Trending Topics Get our Newsletters About Maker Media Chapter 10: Computers and Electronics -- Build a simple 1 watt audio amplifier A simple 1 watt audio amplifier The solderless breadboard makes it easy to experiment with additions to the radio circuit. In this section, we will build a simple amplifier, so that a whole room can hear the radio through a speaker. Our amplifier will not be ear shattering, since we have made it as simple as we can to build, but the output is pretty impressive for a single transistor. Click on photo for a larger picture With the amplifier, our radio looks like the photo above. Below is a closeup of the amplifier section: We carry all the parts for the amplifier (except the battery) in our catalog. The amplifier needs these parts: An MPSW45A Darlington transistor This is the main working part of the amplifier. Using the labeled grid as before, the parts are connected this way: A more permanent version As before, we can copy the circuit onto a printed circuit board and solder all of the parts firmly in place. How does it do that? The heart of the amplifier is the transistor. Del.icio.us Google
FC's Electronic Circuits FC's Circuit Archive contains many electronic circuits that I have designed and documented. I have attempted to include a number of unusual circuits, with an emphasis on useful applications over simple toy circuits. The majority of these projects can be built with readily available discrete components. Only a few of the circuits here rely on microprocessors. Bucking that trend, the Arduino platform is an easy to learn microprocessor platform with a free software development environment that is so popular it should be around for many years. Most of the circuits on this site have been drawn with the open-source and cross-platform XCircuit circuit drawing program. I'm a big fan of the Linux operating system. Linux makes a great platform for dedicated systems: take an older computer, install Linux and the appropriate free software utilities and turn it into a specialized device.
scitoys.com - Computers and Electronics Building a computer controlled radio transmitter How would you like to send text messages to your friends without wires, and without an Internet connection, and without paying monthly fees? In this project we will build a very simple radio transmitter that you attach to a serial port on your computer. The computer then runs a free program that converts words you type into radio signals that are decoded by another computer, using a cheap radio receiver, and a sound card. With a little study, you don't even need the second computer, since the radio signals are in Morse code, which anyone can learn to decode in their head with a little practice. Click on photo for a larger picture The computer controlled transmitter needs these parts: (We carry most of the necessary parts in our catalog.) A one megahertz oscillator You can use other frequencies if you have a radio that can receive them. For our first transmitter, we will connect the parts with alligator clips. Controlling the transmitter
Circuit Simulator Applet This is an electronic circuit simulator. When the applet starts up you will see an animated schematic of a simple LRC circuit. The green color indicates positive voltage. The gray color indicates ground. A red color indicates negative voltage. The moving yellow dots indicate current. To turn a switch on or off, just click on it. The "Circuits" menu contains a lot of sample circuits for you to try. Full Screen version. Directions. Standalone (offline) versions. Index of Circuit Examples.
Don't pay for eBay selling tools! (Free eBay Seller Softwar Powerful research, fee calculation, and listing services are available for free - Sam Carson reviews the best. So, you're selling a few things on eBay? Want to optimize your listing for the most traffic and highest impact? There are several tools available to help with research and listing. Here's the best part: powerful research, fee calculation, and listing management services are available for free. Last week I had seven awful looking Gnomes sitting in my garden, but with the free tools I was able to: Target my eBay listing to the most effective category, at the best time of day, with the keywords buyers are most likely to be searching for. Understand Your Market So goes the selling mantra. eBay have their own free research tool. Terapeak provides an online suite of research tools, and the basic tools for eBay.com are free ("International" sites come at a cost). Now I've done my research, and I list all my Gnomes on eBay following the free advice from Mpire and Terapeak. Goodbye Gnomes
Electronics Project Design Schematics and circuit diagrams CircuitLab - online schematic editor & circuit simulator