Basic BJT Amplifier Configurations Common Base Configuration Here the base is the common terminal. Used frequently for RF applications, this stage has the following properties. Low input impedance, high output impedance, unity (or less) current gain and high voltage gain.Common Collector Configuration This last configuration is also more commonly known as the emitter follower.
College Instrumentation Specialist - NEETS * These files are Adobe Acrobat files that are 100-400 pages in length and depending on your ISP connection speed may take some time to open. You can also save these files directly to your computer without opening them by right-clicking on the link then select "Save Target As". All text below is copied directly from the forward that is in each NEETS manual: The Navy Electricity and Electronics Training Series (NEETS) was developed for use by personnel in many electrical and electronic related Navy ratings. The series is designed to give small amounts of information that can be easily digested before advancing further into the more complex material. Module 1 - Introduction to Matter, Energy and Direct Current, introduces the course with a short history of electricity and electronics and proceeds into the characteristics of matter, energy and direct current (DC). Module 8 - Introduction to Amplifiers, covers amplifiers. Module 20 - Master Glossary, is the glossary of terms for the series.
Audio Filters -- Theory and Practice Audio Filters - Theory and Practice by Ethan Winer This article first appeared in the August 1981 issue of Recording-engineer/producer magazine. In a previous article I explained that capacitors are essentially frequency-dependant resistors. One type of filter is the high-pass (or low-cut) shown schematically in Figure 1, along with the resultant frequency response. The low-pass filter, shown in Figure 2, is constructed by transposing the resistor and capacitor. A third kind of filter is the band-pass shown in Figure 3. On a parametric equalizer, there is a control for varying bandwidth, or how far from the center frequency the boost and cut action extends. Although the bandwidth in this simple circuit can be changed by varying the ratio of the inductor to the capacitor, a much better approach is to use an op-amp to provide positive feedback. A typical octave graphic equalizer has a Q of 1 on each of its control bands. 1. 2. TABLE 1: Component Values for 60 Hz.
Preparing the circuit Since I have no experience in electronics whatsoever, this was the toughest part for me to find out. Other instructables had no good explaining on this subject. So for everyone who's new to this electronics stuff and have no idea what they're doing, here is some explaining for the circuit. 1. How many LED's to use? So if you use a 12v adapter with the 3v LED's its: 12 / 3 = 4 LED's You can also put LED's parallel in the circuit. 2. So that means I can calculate the LED's again: 18 / 3 = 6 LED's. Since I'm going to make the LED's in series I can use 6 LED's in my circuit. 3. Now with this information you can go to the next step, building the circuit.
High Quality Sound Mixer High Quality Audio MixerRod Elliott (ESP) Introduction This project is probably the most ambitious so far, and can be expected to be very expensive. On the positive side, it is also capable of excellent performance, and can be tailored to suit your exact specifications. The project is presented in parts, and Part 1 shows the mic/line module and has some background information on noise measurements and the general philosophy behind the project. Description Since the project is presented in stages, this is an index for the various modules, and as the system is developed will also be the place to look for updates and other information. The additional modules, metering and a complete system layout will be added to the list as they are developed. NOTE: There has been a surprising amount of interest in this project, with a common requirement being a smaller version (an almost equally common request has been for a bigger version, too). Projects Index Main Index
Circuit Theory/Laplace Transform Laplace Transform[edit] The Laplace Transform is a powerful tool that is very useful in Electrical Engineering. The transform allows equations in the "time domain" to be transformed into an equivalent equation in the Complex S Domain. The laplace transform is an integral transform, although the reader does not need to have a knowledge of integral calculus because all results will be provided. This page will discuss the Laplace transform as being simply a tool for solving and manipulating ordinary differential equations. Laplace transformations of circuit elements are similar to phasor representations, but they are not the same. , while the Laplace transform uses the variable s. The transform is named after the mathematician Pierre Simon Laplace (1749-1827). Laplace Domain[edit] The Laplace domain, or the "Complex s Domain" is the domain into which the Laplace transform transforms a time-domain equation. s is a complex variable, composed of real and imaginary parts: The Transform[edit] . of
Ken Stone's Modular Synthesizer Band Pass Filter for music synthesizers. This module is a simple bandpass filter with manually adjustable center frequency and Q. It is good for setting up artificial resonances for virtual instruments. Personally I find this sort of filter more interesting than the VCF, and as I needed a few more of them in my system I have produced this PCB. A little on how it works: The schematic of the Band Pass Filter. CX on the overlay is simply an optional part to allow easy conversion to an AC coupled output. Construction The component overlay of the earlier version. The component overlay of Rev 1. Before you start assembly, check the board for etching faults. When you are happy with the printed circuit board, construction can proceed as normal, starting with the resistors first, followed by the IC sockets if used, then moving onto the taller components. Take particular care with the orientation of the polarized components, the electrolytics, diodes, and ICs. The original unit uses LM1458 op-amps.
Download Center Download Center - EEP (Learning center for electrical engineers) Welcome to EEP’s Download Center! There are three main sections which covers electrical books & guides, software & tools and design documentation. Feel free to explore our great recourses, and if you have any suggestions or complaints please contact us. EEP’s Download Center provides greatest resource for education and learning in field of electricity science. All documents are completely free to download. Books & Guides Electric power books are divided into few sections, so it is easy for power engineers to find appropriate book, guide or information related to power engineering, automation, industry etc. - Electrical Eng. Explore section Software & Tools Electrical design without appropriate software and tools is impossible to imagine. - CalcuLuX Area - DIALux - Relux - Ecodial - Visual Design Docs Almost every electrical design project has some documents repeating from one to another project with some modifications.
Audio projects, circuits and audio kits Muting Transistor Attenuator Circuits and the 2SC2878 by Jim Keith | Among semiconductors, the muting transistor and its audio application is perhaps the most obscure and poorly understood of all. CMoy Headphone Amp by DigiKey | The CMoy headphone amp is a popular headphone amplifier that is small enough to carry everyday and powerful enough to drive headphones at higher levels than normal. Hybrid Headphone Amp Potentially, headphone listening can be technically superior since room reflections are eliminated and the intimate contact between transducer and ear mean that only tiny amounts of power are required. Audio Compression Amplifier /AGC This is an audio compressor/AGC (automatic gain control) with an astonishing 75db input voltage range. Kojak Siren by P. Here is a very simple Kojak siren that is built with two 555 timer ICs and has 2 linear potentiometers that allows the control of sound speed and tone. LA4440 Audio Amplifier Application: Make your own computer speaker system.