Introduction Features Transmitter description Schematic of the transmitter The transmitter is constituted by AT90S2323 microcontroller and TLP-418A RF transmitter module that works at 418MHz.
In keeping with the purest standards of junk craft, I refused to purchase anything for this project. But over time I was able to extract the following from my various hoards of trash: Here's a great reference: http://www.rmcybernetics.com/science/high_voltage/contact_elec.htm (The diagram I've posted is from that page) Sphere: - Metal M & M Brushes: - Copper wire, solid - copper wire, stranded Belt: - Big black rubber band: 1/2" wide, ~6" extended Housing: - 1" diameter PVC pipe (cut to a bit over 7") - Old PC power cable (for ground) Roller #1: - 1/4" dia. bolt; 2 1-4" long (toilet tank mounting hardware, if I recall correctly), & nut - plastic "beads" from a jump rope (my daughter's jump rope had half a dozen of these left over after I shortened her rope) Roller #2: - Wire hanger (welding rod, etc would work) - glass beads - Gorilla Glue Drive: - Cordless Drill (I tried using some random motors, but none of them had enough torque to spin my low-tech roller!)
Back to Projects Page! Home! The Adjustable Voltage Regulator Many amateurs have stopped by their local Radio Shack store and have noticed the famous LM317T adjustable voltage regulator.
<img src="http://makezineblog.files.wordpress.com/2008/01/smd-1.jpg?w=500&h=385" height="385" width="500" border="0" hspace="4" vspace="4" alt="Smd-1" /> SparkFun has a great SMD Soldering lesson (part of their learn how to make a Simon kit class) – Link. Related: <img src="http://makezineblog.files.wordpress.com/2008/01/_img413_1088-1.jpg?
As the circuit has to be constituted by a few and cheap components, I chose the DEM128064A graphical LCD based on KS0108 controller chip to display the measured signals. The ATmega32 microcontroller is chosen because it has a lot of IN/OUT pins and a 2kB RAM size. 1kB is needed from gLCD and some bytes of the rest 1kB are used in C source code as registers. Because my oscilloscope has to read both AC and DC currents and at the same time it should have a High input resistance, I chose to use an LM358 which is a dual operational amplifier.
MP4 | Hi-Def | Blip | Youtube | PDF | Subscribe This week, Windell Oskay of Evil Mad Scientist Laboratories joins me to teach you how to make a super clever little circuit called the Joule Thief! The Joule Thief allows you to squeeze the life out of what most people think of as “dead” batteries! We were inspired by Big Clive to make this project and it’s the perfect platform for a flashlight, book reading light, or really just something you should make to get more use out of your batteries!
Computer power supplies cost around US$15,but lab power supplies can run you $100 or more! By converting the cheap (free) ATX power supplies that can be found in any discarded computer, you can get a phenomenal lab power supply with huge current outputs, short circuit protection, and very tight voltage regulation. In this instructable I will show you how to quickly convert one of those many computer power supplies into something that you can use to power your electronics projects, for electroplating, for electroetching, for heating wires for foam cutting, etc. The voltages that can be output by this unit are 24v (+12, -12), 17v (+5, -12), 12v (+12, 0), 10v (+5, -5), 7v (+12, +5), 5v (+5, 0) which should be sufficient for most electrical testing. Many ATX power supplies with a 24-pin connector for motherboards will not supply the -5V lead.
Here’s a simple problem: “How do you make an LED turn on when it gets dark?” You might call it the “nightlight problem,” but the same sort of question comes up in a lot of familiar situations– emergency lights, street lights, silly computer keyboard backlights, and the list goes on. Solutions? Lots. The time-honored tradition is to use a circuit with a CdS photoresistor , sometimes called a photocell or LDR, for “light-dependent resistor.” (Circuit Example 1 , Example 2 .)
Oscilloscope Tutorials 7 : here, keep it you 7 : for the, very well written impotence rates after prostatectomy . One that face in trying to support their alcoholic relatives is that often they cannot respond to the actual cheap antabuse no prescription .
In order to make your El wire light up you will need a driver or sequencer of some sort to power it. No need to be afraid of these terms - the drivers and sequencers just delver power to the wire similar to how a power brick delivers power to your laptop. You can buy a driver or sequencer from the same place you get your EL wire. You will also need either a harness or some kind of connecting wires to attach the EL wire to the driver or sequencer.
Did you know that you could recreate thunderstorm lightning in your own home? It's possible and is really easy to do. Granted, it's not nearly as exciting as a good old fashion thunderstorm, but the effect is still pretty cool and this lightning won't kill you! The scientific name for this experiment is a water-drop electrostatic generator . Watch the video for a quick overview, then check out the detailed instructions to see how to build your own!
A DC power supply can be hard to find and expensive. With features that are more or less hit or miss for what you need. In this Instructable, I will show you how to convert a computer power supply into a regular DC power supply with 12, 5 and 3.3 volt outputs. For about $10!
A voltage controlled resistor can be used to change the frequency of an oscillator. When a voltage controls the frequency of an oscillator, it is called a voltage controlled oscillator or VCO for short. VCOs are used in FM modulation, mainly. In this case, it used to make a two tone siren which you can see in operation in the video below (Note: the flashing LED is part of the voltage controlled resistor assembly, I did not paint it black to show how it operates. My hand is changing the pitch of VCO because it is shutting out the ambient light that affects the exposed photocell)
An H-bridge is a type of circuit that you can use to get a reversible DC motor to spin both clockwise and counterclockwise. In other words, this circuit allows you to quickly reverse the direction a motor is spinning by using a switch or controller chip to change its direction. I'm going to show you how to make the simplest and most reliable form of H-bridge that I know how to make. I must warn you that this is by no means the best H-bridge design and, in fact, it has a couple shortcoming which I will explain later.