Volume I - DC : All About Circuits. Beginners Guide. Beginners Guide to Electronics by Martin T.
Pickering Last updated on November 23, 2008. Transformers Basics, Maintenance and Diagnostics. Transformers Basics, Maintenance and Diagnostics Transformer action depends upon magnetic lines of force (flux).
At the instant a transformer primary is energized with AC, a flow of electrons (current) begins. During the instant of switch closing, buildup of current and magnetic field occurs. As current begins the positive portion of the sine wave, lines of magnetic force (flux) develop outward from the coil and continue to expand until the current is at its positive peak.
The magnetic field is also at its positive peak. The magnetic flux switches direction and also reaches its peak in the opposite direction. With an AC power circuit, the current changes (alternates) continually 60 times per second, which is standard in the United States. CircuitLab - online schematic editor & circuit simulator. Water circuit analogy to electric circuit. Flowing Electrical Energy. AllPinouts. Power supply circuits and projects - Page 4 of 21. 24V SCR Battery Charger by Jim Keith | This is an extension of the earlier 12V SCR Battery Charger.
It is surprisingly easy to increase the output voltage to 24V, but there are both obvious and subtle differences to consider. 5 Universities with Free Online Electrical Engineering Courses. Learn about electrical engineering with these free online courses.
See the full list of free electrical engineering courses and find the course that's right for you. Free Online Course Information and Requirements Students interested in free online electrical engineering courses find that materials like handouts, problem sets and lecture notes are often available as PDF files. Courses may also offer instruction via recorded video lectures. Free online electrical engineering courses cover topics ranging from circuit design and probability theory to mathematical operations and product testing. In addition to the multimedia software required to access these materials, students may need to download specific software programs before beginning some courses. Delft University of Technology. Free Online Schematic Drawing Tool.
Opamp Current Source. Current Source with Floating Load CURR_SRC1.CIR Download the SPICE file Getting optimum performance in certain applications requires that some components - sensors, DC motors, transistors - be driven or biased by a constant current.
We're mostly familiar with voltage regulators and their ability to maintain a constant voltage under varying current conditions. In this application, your challenge is to provide a constant current regardless of the voltage developed across the load. However, there are errors and voltage limitations to be reckoned with. Lastscan_0.jpg (JPEG Image, 1753 × 1241 pixels) - Scaled (59%)
Filter Design and Analysis. This page is the index of web calculator that design and analysis analog filters.
RC Filters LR Filter RLC Filter. Ohmslaw.jpg (JPEG Image, 600 × 600 pixels) Phasor Diagrams. Phasor Diagrams In AC electrical theory every power source supplies a voltage that is either a sine wave of one particular frequency or can be considered as a sum of sine waves of differing frequencies.
The neat thing about a sine wave such as V(t) = Asin(ωt + δ) is that it can be considered to be directly related to a vector of length A revolving in a circle with angular velocity ω - in fact just the y component of the vector. The phase constant δ is the starting angle at t = 0. In Figure 1, an animated GIF shows this relation [you may need to click on the image for it to animate]. Since a pen and paper drawing cannot be animated so easily, a 2D drawing of a rotating vector shows the vector inscribed in the centre of a circle as indicated in Figure 2 below.
When two sine waves are produced on the same display, one wave is often said to be leading or lagging the other. Considering sine waves as vertical components of vectors has more important properties. 5.23sin(ωt + 76.0°) . Making a Bridge Rectifier - Electronics. HTML5 - Resistor Calculator. Useful Formulas and Preventive Maintenance to Use Online Calculator Software. Online Electronic Circuit Simulator.
Circuit Diagram v0.4-Beta Freeware Download - Circuit Diagram enables you to make electronic circuit diagrams and allows them to be exported as images. UML Diagram Maker is a powerful yet easy-to-use UML diagram drawing program which makes it easy to create professional-looking UML diagrams with built-in symbols and templates.
Easy to make UML sequence diagram, use case diagram, UML class diagram, UML... Network diagram maker is excellent in drawing network diagrams (AWS, Cisco, Rack...) on Mac, Windows and Linux. Download Electrical Circuit Diagram Software: Circuit Diagram, Troubleshooting Basic Electrical Circuits, AKNM Circuit Magic. Big LED Breakthrough at Purdue University Could Change the World.
Update: Breakthrough: Regular Light Bulb Made Super-Efficient with Laser (!)
Better, Cheaper LEDsThe incandescent lightbulb that wastes 90% of the electricity as heat is dying, we all know that. But a new breakthrough in solid state lighting might also kill compact fluorescent lightbulbs (CFLs) faster than some expected. Scientists at Purdue University have figured out how to manufacture LED solid-state lights on regular metal-coated silicon wafers (more details below). What this means is: much lower costs. 10% Reduction in Total Electricity UseAnd since about 1/3 of U.S. electricity is used to produce light, this is major. Old LEDs vs.
Dailytech: In sapphire based LEDs, used for green or blue lighting, mirror-like reflectors are need to reflect and resend emitted light, increasing the efficiency. But the new LEDs can be made using standard silicon wafers and already existing, less expensive, processes. The new techniques yield a crystalline structure aligned to the crystalline silicon. Transformers and Long-Distance Power Transmission.
Transformers are devices which use mutual induction to change the voltage and current of an AC circuit.
A transformer with primary coil of Np turns and secondary coil of Ns turns will have ratios of voltage and current Vs Ns Ip ---- = ---- = ---- Vp Np Is Jargon: Ns > Np step-up transformer Ns < Np step-down transformer Viewgraph 1 Viewgraph 2. Volume I - DC : All About Circuits. 6.00 Introduction to Computer Science and Programming, Fall 2008. Index of /~ee130/sp07/lectures. Electronics Demonstrations. Alternative Energy Article: Circuits. Electricity Explained So Clearly, Even Your Dog Could Understand It! Electricity Explained - Analogously! First of all, we must credit Ian Woofenden and Home Power magazine (www.homepower.com) for the following article, which is reproduced here in its entirety, because we decided we just couldn't top it. We think it does a great job of explaining electricity in really straightforward terms, with an imaginative use of a water pump as an analogy.
So, here it is. Electricity Explained - Intro For a long time, folks have been wrestling to come up with a comprehensive analogy for basic electrical terms and functions. In the diagram below, the pump is analogous to the generating source—PV, wind generator, etc. Electricity Explained - Volts As Water Pressure, etc. Volts are analogous to pressure in the water pipe.