electronic projects
Get flash to fully experience Pearltrees
LEDs
All great websites have a great server behind them. In this tutorial, I’ll show you how to set up a dedicated web server (with Apache, MySQL, and PHP) using that old computer you have lying around the house and some free software. Now that you’ve downloaded and burned the ISO, let’s get Ubuntu installed on your server. Put the disk in the drive, and boot from the CD. In most modern computers, this will happen by default if a disk is in the drive when you turn it on. If it doesn’t, then you need to press a key on your keyboard right when you turn it on.
How to Setup a Dedicated Web Server for Free | Nettuts+
How To Boot From A USB Flash Drive For starters this is still a developing science and most people have had good luck with at least one of these methods. Note that flash drives are often also called thumb drives, keychain drives, pendrives, etc. 1. The PC has to support booting from a USB flash/pen/key drive.
Boot From A USB Flash/Pen/Key Drive
Image from Wikihow What do college students use more than internet and beer? Now you can combine the powers of these two great inventions to improve the Wi-Fi signal in your apartment or dorm. Wikihow has the plans for a beer can antenna booster (although I can’t imagine it wouldn’t work with a soda can too), and it looks awesome. Basically you’ll need to cut open the can to resemble a simple satellite dish, and place your router’s antenna through the hole in the top. The design is undoubtedly directional, and probably wouldn’t work very well if you were lucky enough to place your router in the middle of an apartment. If it’s hidden away in the corner however, or you just want to boost the signal temporarily in a specific direction, there’s no reason not to give it a try.
Use a Beer Can to Boost Your Wi-Fi Signal | HackCollege
Before going any further, read the document I've attached to this step, "A Day in the Life of a Flux Reversal" by Count Zero. This document is pretty much the bible on how magnetic stripes work, and you need to understand how data is encoded on to them and the basic formatting of the tracks on a given magnetic stripe card. I'm going to go get a cup of coffee; have it read by the time I get back. Finished?
Magnetic stripe card spoofer
Sonik Dynamik Magnetik Kard Enkoder
The electromagnet. I haven't counted the number of turns or dimensions or anything. I passed the 30 gauge enamel coated magnet wire back and forth over the stainless steel shim about 7 times, or until "it looks powerful enough". Looking at how much is left on my roll, I used about 25 feet of wire on the shim, which is a T shape 3/16" wide at its narrowest, then expanding to 1/2" at the end, by 2 1/2" total length.
Two Wavebubbles. Left is an earlier revision with the top removed and with external antennas. Right is v1.0 with internal antennas, fit into a pack of cigarettes. This website details the design and construction Wave Bubble: a self-tuning, wide-bandwidth portable RF jammer. The device is lightweight and small for easy camouflaging: it is the size of a pack of cigarettes. An internal lithium-ion battery provides up to 2 hours of jamming (two bands, such as cell) or 4 hours (single band, such as cordless phone, GPS, WiFi, bluetooth, etc).
Wave Bubble
Make a Joule thief.
In the November 1999 issue of EPE (Everyday Practical Electronics), a small and intriguing circuit was published in the Ingenuity Unlimited section by Z. Kaparnik. It was a very small implementation of a typical transformer feedback single transistor invertor. The transformer was a standard ferrite bead with two windings wound on it and the circuit was using the high voltage pulse generated when the transistor turns off to light an LED from a single 1.5V battery.
LEDs for Beginners
So I wasn't completely honest - I have used LEDs once or twice before for simple applications, but I never really knew what I was doing, and since so many projects on instructables use LEDs, I thought I might as well teach myself and post about it too. I know that there are many projects already posted that contain information about how to wire LEDs for simple projects - LED Throwies , LED Beginner Project: Part 2 and 9v LED flashlight - teh best evarrr! , but I think that there could still be some use for a detailed step by step explanation about the basics of LEDs for anyone who could use it.
A disposable torch with long life (I hope I don’t invent the wheel once more) I bought ‘tic-tac’ mint candy and found out that this package must be ideal for 3 AAA batteries to make a small torch (or lamp) with. Yes the batteries fitted perfect - I soldered them in series and used a small micro switch from an old circuit-board together with an ultra bright white LED (25.000 mcd - 3,8 volt and 20 mA - 35 degrees) and a serial resistor of 27 ohm (to make it 3,8 Volt). I drilled a 5 mm hole for the LED and a 3 mm for the micro switch. Then I glued all together - and now I have a nice, small, very bright torch - I think the batteries will last longer than ‘best before date’.