Fix for a Linear taper Pot « JT30 – Amplified Blues Harmonica One of the big problems with working with high impedance mics is that a volume control potentiometer must be large enough to match both the element impedance and the input impedance of the amplifier. Volume control pots for high impedance mics feeding tube amps should be larger than 100K ohms and a 1-meg pot is a common value. The actual tonal difference, to my ears, between a 100k and a 5-meg is small. Other differences in the circuit, the qualities of the mic, the characteristics of the amp, and the acoustics of the room are much more noticeable than the small tone changes introduced by the volume pot. The main problem, though with using a large value for the pot is the difficulty of finding an audio taper pot.
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. Bubble Machine Making your own bubble machine is a really easy and fun project. It can be made from almost anything, glued and screwed together with an end result which will keep kids (and adults!) amused for hours. With basic electronics of just a fan and a motor, a bubble machine is also a really easy first electronics project.
Smart Materials Welcome to this interactive handbook on Smart materials for designers, it should be your key to many new and exciting products that will be possible only if you use Smart materials. Using a simple table at the bottom of this page, explore the options. However, you are probably wondering what are Smart materials, how do they work and what can I do with them? Take a look round and let your imagination runs free over the possibilities. What are smart materials? This sounds a simple question but is not that easy to answer beyond the obvious, and really not too helpful statement "a material that displays smart behaviour". 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. Written by, and with the advice of, senior technicians in these ratings, this series provides beginners with fundamental electrical and electronic concepts through self-study. The presentation of this series is not oriented to any specific rating structure, but is divided into modules containing related information organized into traditional paths of instruction.
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. The most obvious difference is the transition from full-wave center-tapped to a full-wave bridge configuration. In this case, the full-wave... Ampeg Scrambler Ampeg Scrambler The Wild Octaver This is the clone of the very rare Ampeg Scrambler, which was built in very small numbers back in the late 60s. Originals are very rare these days and sell of outrageously high prices when one does become available, similar to the Tycobrahe Octavia. Guess what? I love this thing! This pedal is everything that I expected it to be and more!
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. Guitar & Bass Wiring Modifications & Diagrams Guitar & Bass Wiring Modifications Welcome to the Guitar Electronics wiring mods page. Here you will wiring diagrams and explanations for many common (and not so common) wiring modifications. Everything from coil splitting humbuckers, reverse phase, coil tapping, reverse phase, series/parallel, kill switches, volume and tone mods and many other wiring tricks to get the most function and useful tone from your electric guitar or bass. Humbucker Wiring Mods Guitar wiring mod that shows how to tap the North coil of a standard four wire humbucker.
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. other In this schematic you can see, apart from standard elements, a DPDT on-on switch, wich can be an external element or a part of a push-pull potentiometer. It's used to switch off the capacitor and tone potentiometer together with their grounding. In effect of thi operation, the sound will be more natural (no impact from the tone cap. and the tone pot.). It can be done in all types of wiring (3x single coil pickup, 2x humbucker; two pots, four pots etc.)
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.
September 2010 How to have a lot of tones, from just only one pickup and two potentiometers, like in some jazz, hollow-body guitars, Gibson Melody Maker or Fender Esquire? It's easy when you mount in some push-pull potentiometers, instead of standard pots. With that stuff, you have two DPDT on-on switches. Making a Bridge Rectifier - Electronics Find out how to make a bridge rectifier for your wind turbine home > electronics | windA Bridge Rectifier is an essential part of any home made (DIY) wind turbine generator (or Water Wheel). A bridge rectifier converts the alternating (AC) current generated into Direct Current (DC) which can be sent to a battery bank. Low voltage wind turbine generators e.g. 12 volts can generate high currents of electricity which will fry small bridge rectifiers - however high current rated three-phase bridge rectifiers are very expensive to buy.