Mr. EQ - A simple, yet potent DIY equalizer. Schematic, PCB/perfboard layouts, and photos.
Little Gem - Two 9v battery-powered amps based on the LM386. Schematic and PCB/perfboard layouts.
Eighteen - The Marshall 18W adapted for use as a distortion stompbox. Schematic, PCB/perfboard layouts, and photos.
Tonemender - An ultra-flexible tonestack with clean boost. Schematic, photo, and PCB/perfboard layouts.
Thor - The legendary Marshall 100W Super Lead adapted for use as a distortion stompbox. Schematic and PCB layout.
The Thunderchief project, released in March 2004, was the first runoffgroove.com circuit that was developed using the tubes-to-FETs process. Enlightened and inspired by Doug Hammond's excellent Meteor circuit, we used the same approach in an effort to capture some of the legendary magic of the Marshall Super Lead. The circuit's performance pleased us, but there were issues.
Splitter-Blend - Dual parallel buffered effect loops with blend control. Schematic and perfboard/PCB layouts.
Professor Tweed - The Fender Princeton adapted for use as a distortion stompbox. Schematic, PCB/perfboard layouts, and photos.
My Start as a Ham - Ralph's Story - "I suppose my interest in things electrical began when at a very young age I poked a metal hairpin into an electrical outlet. To this day, I vividly remember the amazing flash and bang that resulted! Of course, I wanted to know why that happened. It was a few years more before I learned to read, and found out about electricity."
The design of switching supplies is a bit more involved than traditional "big iron" transformer power supplies. When taken step-by-step, however, it is quite possible for an amateur to design and build a working high power switching power supply. This article describes a high power, high voltage switch mode power supply designed to operate a KW level RF power amplifier.
Home brew Litz Wire
The Litz wire was fashioned by taking two parallel strands of #18 AWG wire about 115 feet long and twisting them together in a clockwise direction with an electric drill until the twisted wires had about two turns per inch. The twisted wire was then cut into four equal length and laid side by side.
All Mains Inlet Sockets should be Shuttered, so that such a thing does not happen again to any child again. Another Law, No Mains Socket should be less that 5 feet above the ground level.
It is nice to see many building solutions over the Arduino base like this Prototino. Both hardware and software of Arduino are Extensible. This gives opportunity for New tools and Solutions over this compact system Framework.
One Idea can be an Arduino with a CPLD and Universal I/O driver for
robotics. This can come with a Visual IDE which is close or better than
the old Visual Basic 6 in usability.
An Youngster can just Drag Drop Components and Link them to build his
Robot or Home Automation Solution. Robotics Designers can have the
option of looking at the code/hex if needed.
The Prototino is an Arduino clone with a built in prototyping area.
Designed to make a permanent version of your project once you have
perfected it on a breadboard but without the expense of embedding your
original Arduino into your project.
The Prototino also makes your project more reliable and robust. With the prototyping area integrated into the board with the microprocessor, your project will have fewer boards and fewer wires, and because of that, fewer mistakes and fewer shorts.
SpikenzieLabs - Kits and Projects
6135 de Maisonneuve West, Suite 12, Montreal, QC H4A 2A3, Canada.
"I am not a professional electronics engineer, nor do I have an electronics degree. I make no claims for technical accuracy, good design, or necessarily even originality for the contents of these pages.
Rather, I am a simple enthusiast attempting to convey my love and enjoyment of radio, electronics, laptops and computing and perhaps to inspire YOU to build something too."
This ultra-low power QRSS beacon was designed to be as efficient as possible, and produce a milliwatt or few from low voltage, low current supply. My intention was to investigate the use of natural power sources to operate the beacon.
Steve G0XAR visited the G0UPL shack and took some photos of proceedings. Combined with a sneakily obtained photo of G0UPL sleeping somewhere in Texas en-route to Ozarkcon 2007, G0XAR produced this very nice QSL card suggestion!
"This document describes how to construct a dual polarity linear power supply which can be configured for any positive or negative voltage between 1.2-35V. A power supply is the fundamental building block of all but the simplest of electronic devices. It converts the alternating current (AC) from our wall outlets into direct current (DC) at some specified voltage. Because so many electronic devices need DC to function properly, a versatile power supply is the perfect addition to a hobbyist's collection of test equipment. " from Wayback Machine
"There are two versions of the power supply which are fundamentally very similar. The first is a compact fixed-voltage supply measuring 2.9" x 2.2", which is well suited for applications requiring small size and modest current capacity like TTL logic circuits or op-amp based projects such as active crossover networks. The second is a larger (4.6" x 2.25") variable supply sporting more robust heatsinking, and the regulators are positioned such that they may be mounted to a large chassis heatsink for even greater heat dissipation. And since this version of the supply is variable, it is ideal for experimenting. See the photographs near the bottom where I built one into an ATX power supply chassis."