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.
Build an Inexpensive Powered Speaker Make: Projects Build a small powered speaker to amplify your iPod or other headphone music player. MonoBox is a small, inexpensive powered speaker that amplifies the output of your headphone music player. It’s little but it’s loud! untitled Copyright 2000-2006 R.G. Keen. All rights reserved. No permission for local copies or reposting from sites other than This project involves wiring and working with AC mains line voltage. Steiner-Parker : Synthacon Synthacon images courtesy of Audities Foundation Calgary AB, Canada. The Synthacon is a 3 VCO monosynth with a 4 octave 49-note (C-C) keyboard, 26 knobs, 3 trimmers and 43 switches (including 28 color-coded toggle switches). It has thick wooden end pieces and a steep sloped silver (on earlier models) or black control panel above and quite close to the keys. The Synthacon is said to be quite rare. It is unclear exactly how many were made and sold.
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.
Guitar Amp From Jewelry Box - All Cabinet: Wood Jewelry Box Wood Laminate Hide Glue Rubber Feet (4) Small Piece of burlap or speaker cloth 3" Speakers (2) Screws Tung Oil Scrap of 1/4" Wood Plastic Sheet Wood Filler Paint Brush or Sponge Cloth Knobs (2) Electronics: 10 ohm resistor (1) 3.9K resistor (1) 1.5M resistor (1) 1K Linear Potentiometer (1) 10K Linear Potentiometer (1) Schematics Jesse aka Tablebeast has done a wonderful thing by posting a link on the Benders list to a collection of Vintage Casio keyboard manuals. They include the owner’s guides for SK-1, SK-5, SK-8, and DM-100. The SK-1 service manual aka the Bible is also there. Very neat to look at, although I am a little puzzled about the addition of the Tablebeast Modification pages in the PDFs. At this point they seem to contain nothing. At any rate, grab them while you can.
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! PUNCH amplifier: 1W guitar amplifier I've started this project as an alternative to the infamous ROG's Ruby amp. I built a few Ruby's but I didn't like the frequency response of them. So before anything else here is the schematic. As you see it shares with the Ruby the same topology: a buffer and a chip amp. It uses a JFET buffer with a MPF102 and the 1W TDA7052 chip.
Schematics Here is a link that Roger sent me a while ago. Its a website by Frans Samshuijzen with detailed descriptions of some mods that he did to a set of Casio SK-1 keyboards appropriately titled: “Casio Twins“. The mods include a full pitch mod with the use of a TI 74LS624 voltage controlled oscillator. 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
Universal Earbud/Headphone Volume Control So I bought a PMP (Portable Media Player) from Hong Kong so i could play my NES games with the on-board emulator wherever was convenient. Long road trips, flights, waiting rooms, etc. are places that I like to kill time with portable media but the only trouble was that the on-board emulator only had one volume......MAXIMUM. My earbuds of choice didn't have adjustable volume so i needed a solution to turn the game music down a little, I ended up coming up with the 3.5mm Earbud/Headphone Volume Adjuster.
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.). Add Volume, Jack Many cheap, fun sonic and musical toys have built-in speakers and no output jack. This limits their volume, unless you constantly hold them up to a microphone. Here’s how to mod these devices so you can plug them in, adjust their volume, and rock out. The simplest way to install an output jack is to remove the speaker and solder the jack in its place.