How to make a printed circuit board (PCB) using the UV light LED method. This instructable shows how to create well done PCB's using Ultraviolet light. It took us about 40 boards before we perfected our PCB, so we will share what worked and what didn't work. All the supplies can be bought from Fry's Electronics, Ace Hardware, Goodwill, Radio Shack, and Ebay . Our PCB tested the Atmel 208 pin PQFP Integrated Circuit (it may not look like it from the poor image quality but there were no shorts between all 208 pins! The materials needed are as follows. PCB: -Transparencies (MG chemicals brand ) -UV Presensitized Copper Clad Boards (MG chemicals brand ) -Laser printer (Brother HL-2070N) -200 UV LEDs (Bought from Ebay - Asia Engineer, seller giorgio11185. 5mm size, 3.4~3.8 forward voltage, forward current 20 mA, wavelength (nm) 395-400-405, view angle about 25 degrees.) -200 470 ohm resistors (included with Asia Engineer LEDs bought on ebay.
Online Software AVX Spice Software ► PSpice Models Tantalum & Niobium Oxide Capacitors for OrCAD & MicroSim CAD software AVX has provided software SPICE models of popular tantalum and niobium oxidecapacitors. A technical paper is available which outlines how to use these models and discusses some of the specific features which have been included in the SpiTan 3 updated package. Symbols are provided for each part type manufactured by AVX. ► RF/Microwave S-Parameters and Models AVX offers s-parameters for all of the RF/Microwave products that are offered. AVX also works with several of the most popular software vendors to ensure our products are up to date in their software, and are constantly working with new vendors to ensure that they have the most up-to-date AVX libraries. ► Spi2MM (Hard Metric Connectors) Spi2MMHM is an online Engineering tool that allows advanced circuit simulation for AVX series 7200 male and female 2MM Hard Metric connectors ▼ Spice models for Spi2MMHM software ► SpiCALCI 8.0 ► SpiMic
OscilloPhone: Use your Smartphone as an Oscilloscope / Signal Generator The Electronic Circuit of this project is composed of 4 parts: 1. The power supply circuit 2. The Oscilloscope input circuit 3. • The power supply circuit To support and process sinusoidal signals, the OP Amplifiers in the system need to be supplied with asymmetric voltages. The capacitors C1, C2 and C3 are used to avoid voltage drops when a high current is requested from an output. • The Oscilloscope input circuit The actual Oscilloscope input circuit is a slightly modified version of the chipstein's circuit in his "Preamplifier for Smartphone Oscilloscopes", where I changed a few of the resistor and the capacitors values. First, the 1µF capacitor blocks any DC input and then the potentiometer adjusts the signal attenuation. An OP amplifier in unity-gain buffer mode receives the attenuated signal, and adjusts the high impedance circuit. The 100 Ω resistor and the bipolar LED limit the voltages reaching the phone to about ±1.8 V, and also warn you when signals higher than that are present.
National Solar Panel Testing Shunt Regulator I designed the Solar Panel Testing Shunt Regulator to function as a variable voltage shunt regulator for measuring the power output of small solar panels. I wanted to be able to load the output of a solar panel with a variable load to obtain various output voltage levels and measure the corresponding current flow. Repeating current measurements at various voltage levels to characterize a solar panel without having the output voltage level drift. The shunt regulator has a two position range switch. A high range where the shunt regulator starts to conduct at about 28 volts at the minimum shunt setting and a low range that the shunt regulator starts to conduct at about 15 volts with the minimum shunt setting. Both ranges can shunt the solar panel to less than about 1 volt at the maximum shunt setting but the low range has a finer voltage adjustment. Here are the measured voltage levels at full shunt and the corresponding current levels for this unit.
Wireless electricity transmission circuit So to make this circuit you will need: 1) NPN Transistor. I used 2N3904 but you could use any NPN transistor. 2) Magnet wire or insulated wire. 3)Resistor 1 Kilo Ohm. 4) L.E.D light . 5) A 1.5 Volt AA Battery . ( Do not use batteries of higher voltage unless you want to damage your transistor.) Tools needed: 1) Scissors or knife. 2) Soldering Iron (Optional). 3) Lighter (Optional). RF field strength meter | Electronics Repair And Technology News A simple and easy project for a rainy Sunday! Why would you need one? Sometimes we build electronic projects for fun only, or just for satisfying our technical curiosity; this is what I do sometimes. This project, however, started with a need. The need originated when a friend called for help to solve an intermittent problem with the UHF transceiver on his boat. The receiving ends reported frequent cuts in his transmission. I quickly improvised a very simple Field Strength Meter composed of a small antenna, a detector diode, a resistor, capacitor and a Micro Ammeter. From there, the technical curiosity took over; what if we could improve the circuit, making it more sensitive and, how high in frequency it would still work? I gave up (at least temporarily!) And here we go; we have a very simple instrument that can detect the activity of your Wi-Fi router, your mobile phone and about any RF transmitter through a wide range of frequencies. Fig. 1 Schematic diagram Fig 2. Fig 3. Fig 4.
HOW-TO: Build 3D models from Eagle files Overview Over the last few weeks we’ve been building 3D models of our projects in Google SketchUp using the EagleUp script. This script makes a 3D model of the board from Cadsoft Eagle board (.brd) files, and populates it with pre-existing models of components. Once you have a 3D model in SketchUp you are free to evaluate it, build custom enclosures around it, or interface your model with others. Be advised that to build full 3D models of your projects you will have to have models for all your components. Download and Setup There are a few apps you’ll need for everything to function properly. Once you have downloaded everything, install SketchUp and ImageMagick. Extract the EagleUp archiveMove the ”EagleUp_export.ulp” file to the ULP folder located in the Eagle installation folderMove the ”EagleUp_import.rb” file to the Plugins folder in the Google SketchUp installation folderMove the models folder anywhere you like, but remember where it is. Hit OK. Now open the board you want to model.
Rock Seven | Truly global GPS tracking and messaging systems using Iridium satellite | Core About The CORE The CORE is designed to provide a single-point of control for Iridium-based tracking devices. The system can support a multitude of different device types, allowing monitoring of all through a single console. The CORE is a purely web-based system, and can be accessed with any web browser from any internet connection. Whether you have 1 device, or 1000 devices, managing them is easy. The CORE also allows you to add line rental and credits to your devices, and manage your account. Our comprehensive management system provides the facilities needed for you to efficiently manage your fleet, monitor alerts from devices, setup geo-fences to provide early warning if a device has gone inside/outside a certain area etc. Iridium is the only satellite network that allows transmission of information from any point on Earth – other networks have no coverage in the polar regions, and have intermittent or no coverage in other marine and land areas.
Why You Should Be Using a Linear Voltage Regulator Voltage regulators are an essential part of many projects that require a stable input voltage. Their job is to take an unregulated input voltage and output a regulated voltage, with the only catch being that the input voltage must be higher than the output voltage. If you’ve got a project in the works that needs a specific voltage, here are several options you may consider: Fixed Voltage – LM78XX The LM78XX series of linear voltage regulator chips are extremely popular, and for good reason. They’re cheap, easy to use, require few other components, and have built-in circuit protection against drawing too much current. Fixed Voltage – Zener Diode You’re halfway through your project, and you just realized you’re fresh out of linear regulator ICs. Variable Voltage – LM317 When you need to be able to adjust the voltage output of a voltage regulator, the LM317 is right for you. A Note on Heat Sinks Jordan Bunker Technical Editor at Maker Media.
WWW.SIXMHZ.COM What's a sixmhz? This website is a compilation of instructions, ideas and plans for the really stupid and dangerous things I have built. It is my contribution to all DIY folks and dumpster divers, enjoy! Index of My Web Pages Email: firstname.lastname@example.org Electronics: Soundcard-Oscilloscope Most of today's personal computers are equipped with quite advanced soundcards. These soundcards often contain powerful analog/digital converters, able of up to 100 ksamples per second at 16 bit or more. Why not use this capability and build a digital storage oscilloscope around it...? 1. 1. When using the soundcard as an oscilloscope, the low input impedance is a large disadvantage. 2. The circuit consists of a large bandwidth voltage follower built around a CMOS operational amplifier CA3140. Schematic of the input adapter for the soundcard oscilloscope. 3. Of course you could now start to write your own software for this project, or you could use the Windows sound recorder (just kidding...). The user interface of the digital storage oscilloscope "osci" showing noise input on both channels. But time has gone on and so has software development. a dual-trace oscilloscopea X-Y displaya spectrum analyzera signal generator The software is free for private and educational use.
How to Collect Free Energy from Atmosphere - Circuit Diagram Attached - Homemade Circuit Projects A free energy collector circuit helps to convert surrounding radio frequency waves to electric power and can provide 40 watts to 10 watts indefinitely.An option to increase the output power is achievable through proper set-up of an antenna. Placing an antenna in a close proximity of a large metal object helps generate additional power. The wire of an antenna should be more than 150 feet long, which has to be placed horizontally on a higher platform to derive the best result. The proposed free energy collector circuit on the other hand, also acts as a passive detector. So it can be summed up that the placement of an antenna is very much crucial for a better output. The Radio Frequency power varies based upon a location. If you are excited to generate free power at your house from the atmosphere, then you can perform some experiment with different length and size of an antenna. Submitted by: Dhrubajyoti Biswas All Diodes are 1N4148 C1---C8 = 0.22uF/100V mylar More info on the above design:
How to Set up Multiple Monitors – Add Monitors to Your Computer For better or worse, it is a multitasking world we live in. And multiple monitors are uniquely useful for keeping track of numerous programs running simultaneously on your computer. Plenty of studies have pegged the productivity gained by adopting multiple monitors at anywhere from 9 to 50 percent (even if productivity for you means blasting opponents in StarCraft II while tweeting to your followers about how you totally pwned the Zerg). "Multiple monitors reduce [human] memory load by keeping more of your work in front of you," says Cornell professor of ergonomics Alan Hedge, "so you don't have to expend as much energy remembering where things are." Advertisement - Continue Reading Below The analogy of a computer desktop to a physical one is apt, and, in my experience, as the size of my home office desk has increased, the screens on it have gotten bigger and more numerous. Monitor Math So how many monitors can you plug into your computer? Dan Saelinger Outside Help The Art of Arrangement