Allegro PCB Design Tutorials This tutorial is intended for beginners in printed circuit board design who wish to complete a board using Cadence Allegro Tool. This tutorial is for Windows XP but most of the things should be easy to be extended for Linux or Unix. Those who had experience with one or more PCB design tool may skip this page. Others may like to get a general view of the design process which is follows: 1.
Operational amplifier applications This article illustrates some typical applications of operational amplifiers. A simplified schematic notation is used, and the reader is reminded that many details such as device selection and power supply connections are not shown. Operational amplifiers are optimised for use with negative feedback, and this article discusses only negative-feedback applications. When positive feedback is required, a comparator is usually more appropriate. See Comparator applications for further information. Physics Flash Animations We have been increasingly using Flash animations for illustrating Physics content. This page provides access to those animations which may be of general interest. The animations will appear in a separate window. The animations are sorted by category, and the file size of each animation is included in the listing. Also included is the minimum version of the Flash player that is required; the player is available free from The categories are:
Electronics and Electrical Engineering Tools Calculate the maximum current of an internal trace Inputs Trace Width 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
SPICE Last modified: Mai 2015 Hello all, APEC 2015 is over and I posted the PPT I presented Monday morning in front of a full--room audience. Thank you all for coming and attending my presentation, hope you liked the content! I have already ideas for next year's seminar : ) As usual, you will find the PPT in the download area. 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. 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.
anim8or resources This is a very impressive 3D program, created by Steve Glanville. It is free and has remarkable features. It can be used for 3D modeling (creating shapes, objects), character animation, and lots more. 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.