40 Watts Hi-Fi Music System
Stereo Music player with Tuner, 1986, LED VU meter and Analog VU meter.
This was done as repairing home electronics was my hobby in school days, I learnt by building Amplifiers based only on transistors from the Old Philips Circuits and Books.
Home Made Circuits
The above one is TDA2020 20 Watts Per Channel, with LED input level meter and moving-coil output meters. It would have a 5 pin din input and RCA speaker output, input for phono, tape, etc. The Speakers had a woofer, tweeter and midrange with passive crossover network.
Stereo Adapter for Portable Music Player
Low Cost Stereo Adapter 20 Watts for Portable Music Player 1984, Bass Treble and Presence.
This was a TB810 based 10+10 Watts Stereo Amplifier with LM381 or 2 Preamplifier, The portable player docks in a wooden cabinet. There was no IR, Wi-Fi or Bluetooth in those days, so the device would interface with amp thru a stereo ear-phone socket-jack system with a shielded cable. Bass, treble and Presence as per an old phillps audio amp book.
Designing Bipolar Transistor Audio PreAmps, Designing JFET Transistor Audio PreAmps, Designing Op Amp IC Audio PreAmps, Switching Regulator Basics, Using Transistors As Switches.
RASON Projects Page – Amateur Radio
- 10 Amp, 13.8 Volt Power Supply
- 12 Volt Gel Cell Charger
- Thermal Fan Controller
- Transistor Audio Amplifiers
- 12 Volt Gel Cell Charger
- Switching Regulator Basics
A Potpourri of Audio Amplifiers By N1HFX
“I intentionally avoided the use of IC amplifiers to provide a real learning experience for audio amplifier design. Although many IC amplifiers provide excellent performance at low cost, we need to learn the basics first. I will address IC audio amplifiers in a future article.”
The Radio Amateur Society of Norwich
P.O. Box 329 – Norwich, Connecticut 06360
Large stockist and supplier of electronic components throughout the world. The Electronic Components and Semiconductor Superstore.
Integrated Circuits, LED’s / LCD’s, Connectors, Microcontroller Boards, Hardware, Project Boxes, Stepper Motors.
Futurlec Semiconductor Superstore
“Orders from hobbyists and single part orders are most welcome. We do not have any minimum order charge and we welcome all customers from anywhere in the world.”
Mini Boards – Futurlec
These small compact boards are ideal to enhance your control system or development project. Add new functions and expand the functionality of your system, with a wide range to boards to choose from, including MP3, Real-Time Clocks, Keypads, RS232, RS422, Flash Memories, SD Cards and many more.
1133 Broadway, Suite 706, New York, NY 10010 USA
Some things you can find there -CB & Ham radios, Walkie-talkie (GMRS/FRS) radios and Shortwave & multiband radios.
RadioShack- Audio Video Electronics
The company was started as Radio Shack in 1921 in Boston, Massachusetts, by two brothers, Theodore and Milton Deutschmann, who wanted to provide equipment for the cutting-edge field of amateur, or ham radio.
Theodore and Milton Deutschmann opened a one-store retail and mail-order operation in the heart of downtown Boston. They chose the name, “Radio Shack,” which was a term for the small, wooden structure that housed a ship’s radio equipment. The Deutschmanns thought the name was appropriate for a store that would supply the needs of radio officers aboard ships, as well as “ham” radio operators.
The first 40 years – RadioShack Corporation – Wikipedia
“I present, below, a collection of projects I have worked-on over the past few years. For over a decade, I had taught both embedded systems (microcontroller technology) and digital signal processing and practice what I preach….”
Professor Mark Csele – Projects and Hobbies
Nixie Thermostat – A heating and cooling thermostat employing technologies spanning fourty years from the unique Nixie tube display, circa 1960’s, to a PIC 18F microcontroller, circa 2006.
A High-Powered Power Backup Inverter – The working prototype of the 2 KVA inverter is complete. Fed from an array of lead-acid cells totalling 600 Ah (at 12 Volts), it easily drives real-world loads such as single-phase motors. The inverter has been tested and found to operate at an efficiency of between 71% and 82% driving a variety of both inductive and resistive loads
It’s a 360 degree multifunctional programmable sensor that has a bundle of cool features for sensing for your Maker, Robot and Kinetic art type projects.
The sensors is also packed with two ambient light sensors (for light tracking experiments or line following) and IR remote control functionality so it can can read and transmit Sony SIRC IR control signals.
Infrared Control Freak 360 – ROBOTmaker
The sensor is designed to fit onto micro sized robots (50mm x 50mm) where 360 degrees of proximity sensing, ambient light sensing and basic inter-robot communication is required, such as robot swarms, robot research, robot gaming and robot sumo competitions.
This site is offered in the hope that readers will better understand electric guitar technology, leading to creative use of your musical tools. Of course, only practice will improve your musical vocabulary and articulation….
GM Arts – Music Guitar Science
“Hello World! I live in Adelaide, South Australia, and my interests are electric guitar, playing live music, writing MIDI sequences, programming in Visual Basic, dabbling in electronics, with a casual interest in popular science. I have some years of experience in these fields, and use these Web pages to share my knowledge freely. ..”
Most musical instruments and their amplification systems, such as those used for public address (PA), recording and hi-fi are designed to reproduce sound as accurately as possible. Electric guitar and its amplification is completely different: every item in the guitar signal chain is designed to modify the raw guitar signal in some way.
- Guitar Amplifiers – valves vs transistors, some overdrive circuit ideas.
- Guitar Pickups – get the most out of them alone and in combination,
- MIDI Music – A guide on MIDI messages, circuit for a PC-MIDI interface.
Related Resources –
- Pickup Winder Web Page
- Overdrive schematics – partial designs
- Pickup wiring and switching ideas