Hobby Projects - Insulation tester, LED Circuits, Meters.

Tuesday, December 09, 2008

The Circuits Shop - Electronics in Meccano

The Circuits Shop - Electronics in Meccano
The Electronics in Meccano Circuits Shop gives you access to the entire Maplin Electronics catalogue. In addition to the essential components and tools you'll need as an electronics hobbyist, Maplin stock a wide range of electrical items for your home, car, computer and elsewhere.
Electronics in Meccano
Articles on motor control, components, and practical matters like soldering, along with full shopping lists for each circuit described.
  • Remote Controlled Locomotive
  • Horizontal Electric Engine
  • Constructing Circuits
  • Building a Power Supply
  • Simple Motor Control from AC

Electronic Kits and Tools ApogeeKits

Electronic Kits and Tools ApogeeKits

Home of high quality electronic kits, circuits, tools, test equipment, instruments, tutorials, products and plans for the beginner hobby kit builder to professional engineers and technicians.


Monday, December 08, 2008

Heathkit Educational Kits

Heathkit was a well known supplier of electronic kits from 1947 through the early 1990's (although no new kits were developed after 1986). An incredible number of kits were offered including test equipment, amateur and SWL radio, audio, televisions, computers, robotics, automotive and other items difficult to categorize.

Heathkits - Learning with Practical Electronics

THD Improvement kit for IG-18 series audio generators

THD Improvement kit

"The meter buffer is a crucial part of improving the THD specification of the IG-18. The non-linear loading of the analog output can create additional harmonic components due to the non-linearity of the diodes used to drive the meter."

History and Antiquity

In 1947, Heath introduced its first electronic kit, an oscilloscope that sold for US$50 -- the price was unbeatable at the time, and the oscilloscope went on to be a huge seller. Heathkit Wiki.

The Heathkit Virtual Museum, a tribute to the Heathkit era-a time when building electronic kits was a favorite pastime for many electronics hobbyists. This commemorative virtual showcase takes you back to the Heathkit age which began in the late 1940's and lasted through the early 1990's.

Then you ought to look around at Bill Wilkinson's Heath Company Page if you want to know more.

Sunday, December 07, 2008

Quasar Electronics - Hobby eStore

Quasar Electronics - Hobby eStore

 Bipolar Stepper Motor Chopper Driver

Electronic Kits, Modules, Hobby Projects UK Superstore.

Bipolar Stepper Motor Chopper Driver

Features

  • Easily adjustable motor current (0.A to 2A)
  • Full and Half stepping modes
  • Step and Direction inputs
  • Synchroniseable when using multiple drivers
  • Enable input can be connected to ground to disable motor

New bipolar chopper drive allows you to get better performance from your stepper motor. It uses a dual full bridge motor driver based on SGS Thompson chips L297 & L298. Motor current for each phase is set using an on-board potentiometer and the controller is capable of handling motor winding currents of up to 2 Amps per phase.

Saturday, November 15, 2008

Circuit Exchange International

Circuit Exchange International

There are ten categories of schematics, a unified circuit analysis, design and theory page, and also a practical electronic section. The simulation section features the "TINA" and "Circuit Maker" programs.

Friday, November 14, 2008

RadioShack- Audio Video Electronics

RadioShack- Audio Video Electronics

Some things you can find there -CB & Ham radios, Walkie-talkie (GMRS/FRS) radios and Shortwave & multiband radios

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.

RadioShack- Audio Video Electronics

 The first 40 years - RadioShack Corporation - Wikipedia

Mark Rollins - Model Railroading

Mark Rollins - Model Railroading

Model Railroading - model railroad information, complete with model railroad circuit diagrams.

Electrical Circuits you can make! With 3D wiring Sketches, easy for the beginner.

8052.com - The Online 8052 Resource

8052.com - The Online 8052 Resource
 
A web site that is dedicated exclusively to the 8052 mirocontroller, related products (both hardware and software), and 8052 derivative chips. This includes the traditional 8052, 8051, 8032, and 8031 along with more modern derivatives such as the Atmel AT89S8252, and many derivatives by Silicon Laboratories, Philips, and many others.

From Hyper Embedded - Microcontroller ASIC and EDA

The 8052.com SBC is a single-board computer designed to be both useful and instructive in illustrating certain concepts commonly encountered in 8052-based development. Designed to compliment The 8051/8052 Microcontroller Book that was authored by Craig Steiner, the webmaster of 8052.com.

Introduction to the 8052.com SBC

Sunday, October 12, 2008

Hobby Engineering - Supply Store

Hobby Engineering - Supply Store Hobby Engineering

A supply store for people who want to build robots, electronic gadgets, kinetic art or anything else that moves, beeps or flashes.

Ethernet I/O Module

The new EtherIO24 gives you the capability to distribute digital control equipment anywhere you can reach with an Ethernet cable or wireless network. Since the EtherIO24 uses industry standard connections and protocols you can use almost any PC, workstation or network host as a controller for robotic or industrial automation applications. The EtherIO24 is supported by a family of peripheral I/O boards that make connections a snap.

Futurlec Components and Semiconductors

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."

Futurlec Semiconductor Superstore

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.

Futurlec
1133 Broadway, Suite 706, New York, NY 10010 USA

Thursday, October 09, 2008

Logic Analyzer - Frequency Counter

Logic Analyzer - Frequency Counter

FPGA based 16 channel 200MHz / 32 channel 100MHz logic analyzer sump.org Logic Analyzer

The project includes the actual analyzer in VHDL (for Spartan 3 FPGA) and a PC Software for the end user. The design employs a FPGA board that can be obtained easily.

Features

  • 16 channels at 200MHz sampling rate
  • 32 channels up to 100MHz sampling rate
  • state analysis up to 50MHz using external clock
  • connects via EIA232/RS232 (works with usb to serial adapters)
  • More....

Frequency Counter Frequency Counter

100Mhz frequency counter and timer - Hardware, AVR, ATmega, ASM, Electronics, HF

In counter mode it provides 1Hz resolution up to 100Mhz. In timer mode maximum resolution is 0.0000001 Hz up to 1Hz. Resolution is reduced by one digit for each additional decade. Multiple frequency updates per second by employing a sliding window for calculation.

Wednesday, September 10, 2008

Velleman - Kits Tools and Equipment

"VELLEMAN nv has been a major distributor of electronics for more than 35 years. Our warehouses contain over 18,000 different products from 50 brands."

Velleman - Kits Tools and Equipment
  • Velleman kits & oscilloscopes
  • Transformers, coils & motors
  • Semiconductors & sensors
  • Passive components
  • Batteries & chargers
  • Adapters & power supplies
  • Enclosures
They have the Test bench tools, parts and also all the prototyping materials.

A Velleman Power Supply for the Test bench

A Velleman Power Supply for the Test bench

Velleman Inc. 7354 Tower Street, Fort Worth, Texas 76118

Sunday, September 07, 2008

RED Free Circuit Designs

RED Free Circuit Designs

Very good diy audio and music circuit archive, well documented projects. Uses many discrete devices.

Home related Circuits -o- Music related Circuits

Friday, September 05, 2008

Robot Building for Beginners - David Cook

Robot Building for Beginners - David Cook

Sandwich, the line-following robot

David Cook - Robot Room - More Robots

Monday, September 01, 2008

Complete Microwave Oven Troubleshooting

Complete Microwave Oven Troubleshooting

"Here is the ultimate microwave oven troubleshooting and repair resource with do-it-yourself help and instruction by the experts. If you are an appliance technician, perhaps you've found that microwave ovens develop very unique problems which are often quite perplexing ........" Microwave FAQ or/and Q&A.

Troubleshooting (For Qualified Technicians Only)

How To Test the Interlock Switches, Output Power (wattage), Magnetron too.

Friday, August 08, 2008

Home Automation by Edward Cheung

"This centralized system can control almost all of the lights in my home, a few appliances, the garden irrigation, some window treatments, the Audio/Video system, the security system, and the HVAC (Heating Ventilation and Air Conditioning)."

Home Automation by Edward Cheung

"This centralized system can control almost all of the lights in my home, a few appliances, the garden irrigation, some window treatments, the Audio/Video system, the security system, and the HVAC (Heating Ventilation and Air Conditioning)."

Home Automation by Edward Cheung

"I can communicate with the central computer by using keypads throughout the house, any phone in the world (including those inside the home), any browser over the internet, and from my wrist watch. A webcam (with integral pan/tilt) allows me to see what is happening with nothing but a web browser."

Thursday, August 07, 2008

fpga4fun - Electronic Adventures with FPGA

fpga4fun - Electronic Adventures with FPGA

"This site reflects my experience and my opinions on FPGA technology. It is meant to be informative and useful to anybody interested in learning FPGA technology."

- Jean P. Nicolle
  • HDL tutorials
  • SMD technology
  • Crystals and oscillators
  • How FPGAs work
  • Digital oscilloscope

Electronic Projects of Ronald

Ronald Dekker's Nixie Tube Projects and Software. He has many interesting projects like "Mixed-Signal" LED clock, The µTracer, a miniature tube curve tracer. A Tiny 80(C)31 Basic Board.

Electronic Projects of Ronald

I Colored The Sketch at Ronald's site and mailed it to him. Ronald used it in his website!!

Ronald Dekker's Projects

NIXIE II A Talking NIXIE Alarm Clock! This Nixie Alarm clock will wake you up with a personal wake-up message or sound. A "wav" file stored in EPROM is played using only a few counters and a DA converter.

The µSCOPE - A poormans OscilloScope

"These days this obviously can be done much simpler. The present generation of micro controllers is so powerful that such a videoscope concept can be realized almost completely in software. Recently I obtained a sample of the 12f675. On examination of the datasheet of this small 8 pins micro controller from Microchip, it appeared that the small package contained all the components of a miniature videoscope. In short the µSCOPE project was born, with as main objective the challenge of implementing such a relatively complex task in this small micro controller. The result summarized on this web page is a fully functional (memory)scope that samples the analogue input signal and subsequently displays it on a normal TV"

Wednesday, August 06, 2008

David Jones -Tronnort Technology

David Jones -Tronnort Technology

PCB Design Tutorial - As published in Silicon Chip magazine Oct-Dec 2003. A very comprehensive three part tutorial on how to professionally design and lay out PCBs. Learn all the tricks of the trade! A ground breaking article.

10MHz DDS Function Generator - A very low cost 1Hz to 10MHz sine/square function generator using a novel "sliding window" display. Based on the Analog Devices AD9835 DDS chip.

alternatezone

Low Cost 20MHz Function Generator - A 20MHz+ Sine/Square/Triangle function generator based on the Maxim MAX038 chip.

PC Based Digital Storage Oscilloscope Adaptor- A simple and low cost PC Based digital storage scope using a novel architecture.

FSM Compiler Based PLC- A simple and low cost Programmable logic controller based on the Finite State Machine concept. Complete with custom compiler software and source code.

Dr Dave - Mechatronics

Dr Dave - Mechatronics

Dr. David G. Alciatore - Colorado State University

Thursday, July 24, 2008

Lammert Bies - Computer Interfacing

Information about computers and how to interface them to all kind of equipment. Both software and hardware help is available. - Lammert Bies

Lammert Bies - Computer Interfacing

  • RS-232 specs
  • RS-485 information
  • The serial UART
  • USB interface
  • Modbus interface
  • Unitronics RJ11

Simple null modem without handshaking

Simple null modem without handshaking

"only the data lines and signal ground are cross connected in the null modem communication cable. All other pins have no connection. An example of such a null modem cable without handshaking can be seen in the figure below."

Museum Of Electricity - Charles Brush

Yes, there were electric lights powered by central stations before Edison's! Carbon arc lamps saw extensive use throughout the USA and the world from the late 1870s on. - Charles Brush

Museum Of Electricity - Charles Brush

The General Electric Company was formed in 1892. It was the result of a meger between the Edison General electric Company and the Thomson-Houston Company, which themselves incorporated several other companies.

Museum Of Electricity - Charles Brush

Electricity, technology, and lots of arcs and sparks!

Museum Of Electricity contains Vintage Electrical and Historical images and description. They include the Edison Lamp, Tesla Coils, Lightning and Atmospheric Electricity and the .....

Amazing Jacob's Ladder

So how do they work?  First two conductive metal rods are positioned in a rough “V” shape with a slight space between them at the base.  A sufficient voltage differential is provided from a high voltage transformer to breakdown the air in the gap between the rods.

e-Learning Resources - Physics at Exeter

Excellent Online Educational Pages at Exeter. Students and Teachers can get ideas on how to enhance and enrich the Science Education Process.

e-Learning Resources - Physics at Exeter

A Sound understanding of Physics and Chemistry is needed for stepping into “Electricity and Magnetism”. We have to move young minds into Electronics even before High School, as a part of Science itself.

e-Learning Resources – Physics at Exeter
  • Practical Electronics II and Electronics for Measurement Systems
  • Feedback and Temperature Control
  • Computer Interfaces for Instrumentation Systems
  • Troubleshooting Op-Amp Circuits
Troubleshooting Op-Amp Circuits

The ability to diagnose and cure problems in a systematic manner is an exceptionally valuable skill. In PHY2028 students are given a heap of components, a breadboard, and measuring equipment.

Feedback and Temperature Control

System Model, Types of Feedback Control, On-Off Control, Proportional+Derivative Control, Proportional+Integral+Derivative Control, Proportional+Integral Control, Third-Order Systems..

Wednesday, July 23, 2008

Temperature Sensor Project - Quozl

Temperature Sensor Project - Quozl

Features

prototype from kitsrus

  • provides real-time data to your computer via serial port,
  • interfaces up to four DS1820 temperature sensors,
  • absolute accuracy near 0.5 degrees celcius (as per DS1820 specifications),
  • relative accuracy near 0.01 degrees celcius,
  • speaks in Centigrade or Fahrenheit (selectable by header pins),
  • powered by your computer's serial port, no extra supply to organise,
  • data format easily processed, no special programs required,
  • minimal parts count reduces cost,
  • built-in serial number for circuit identification,
  • special versions available for exotic requirements; high speed, low speed, additional sensors, long distance or pedantic serial bus.
  • spare inputs can be used as single-bit digital inputs, (feature removed from final version but can be re-inserted),

Quozl's Temperature Sensor Project

Quozl's Open Source

Monday, June 23, 2008

VU Meter Circuits and Projects

Here is a collection of web pages of VU Meter projects that helps a newbie getting into the Electronics DIY Hobby Land.

VU Meter Circuits and Projects

A Hobby now in your School days or College can help you build a strong profession later. It is Edutainment that will make productive use of your spare time. Friends can do it as a group, during holidays. Parents should encourage healthy hobbies, as the children will grow in a positive and creative atmosphere.

Stereo led level meter - This is it. It's a STEREO LED LEVEL METER. It's the cheapest and best bar graph display available and best of all, it uses readily available components.

VU-meter by Archy - Then it hit me. A VU meter, big, beautiful, professional! From that moment started my thoughts flowing. Those VU-meter ICs that are sold in every electronics shop?

LM3914 dot-bar display driver - The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display.

Knight Rider Display Project - This project started out as a VU meter. I reused parts and pieces to improve the VU meter and give it additional functionality. It is amazing how much time it takes to create a small thing like this.

Adafruit Industries - Unique DIY electronics

Adafruit Industries is a small company that sells kits and parts for original, open source hardware electronics projects featured on ladyada as well as other cool open source tronix that I think are interesting and well-made.

Adafruit Industries - Unique DIY electronics

All the projects are redesigned specifically to make it easy for beginners to make: nicely silkscreened circuit boards, through-hole parts whenever possible, extra large solder pads, etc. For some kits, you can purchase just the circuit board. To save paper, the easy-to-follow-with-lotsa-pictures instructions are all available online, at ladyada.net-make."

Adafruit Industries - Unique DIY electronics

Atmega328 chip has twice as much storage, runs at 16.00 MHz, just like the latest Arduino. Upload baud rate is 57600, use Arduino IDE v13+. Chip comes preprogrammed with my "no-wait" Arduino bootloader.
  • Designed to plug into a breadboard for easy prototyping
  • Petite size, only 3" x 0.8" (75mm x 20mm)
  • All 'standard' pins are brought out - Digital 0 thru 13, Analog 0 thru 5, ARef, 5V, Ground, Vin and Reset
  • Chip comes preprogrammed with a "no-wait" Arduino bootloader
  • 2 LEDs, green power and red "pin 13" just like the Arduino Diecimila
  • Available as a low cost kit with standard parts, so its never out of stock
  • All through-hole parts are easy to solder
Boarduino (Arduino Clone) Kit

This clone acts just like an Arduino, and works with the latest Arduino software. For many projects it can even be preferable! The kit includes all parts necessary, the assembly is straightforward and well documented.

Sunday, June 22, 2008

diy4fun - Miroslav Batek Czech Republic

diy4fun - Miroslav Batek Czech Republic
  • Make a Sound Card with PCM2702
  • ATmega48/88/168 Development Board
diy4funThis is versatile development board for AVR microcontrollers ATmega48/88/168. It is good for testing and debugging embedded programs. It has many built-in peripheries connected to microcontroller so you can use them without soldering. ATmega microcontrollers are produced by ATMEL and they include a lot of features: I/O, Timers, PWM generators, ADC, RS232, TWI, SPI, Analog Comparator, Oscillator, EEPROM… These microcontrollers are very versatile, easy to program and easy to use. This is the reason why I like these microcontrollers and why I decided to make development board for them.

Play-Hookey - Online Classroom - Edutainment

This Website is intended for those intrepid individuals who, for whatever reason, find themselves looking for a less than formal approach to useful education in a number of technical fields.

Play-Hookey - Online Classroom

Digital logic is at the core of all digital computers, and yet it is entirely based on three fundamental operations, designated AND, OR, and NOT. See how it's possible in these pages…..
These pages now include coverage of the major logic families as well as some practical experiments that you can perform with real components to see for yourself how they work.
  • DC Electronic Theory.
  • AC Electronic Theory.
  • Op Amps and Analog Circuits.
  • Take a look at optics.
  • What's inside these semiconductors?
Line Clock - Play-Hookey

Line Clock - Play-Hookey

"In many digital circuits, we need a regular and continuous train of pulses to control the timing of various circuits. In some cases, we want two separate pulse trains, one the inverse of the other. In other cases, we may want two square wave pulse trains in quadrature...."

(An Excellent Interactive Resource, Technically Accurate, Electronics Edutainment - delabs)

Thursday, June 19, 2008

Danish Audio ConnecT - Denmark

Danish Audio ConnecT. High quality audio parts. High-End Audio Parts for Hi-Fi, A/V and Pro-Audio. DACT products are used by audio and A/V audio equipment manufacturers and by DIY audiophiles throughout the world.

Danish Audio ConnecT - Denmark

Back in 1995, the first DACT product was the well-know CT1 and later CT2 stepped attenuator, which still today remain the single most recognized state-of-the-art audio volume control.

Danish Audio ConnecT - Denmark

The CT100 is a two-channel phono preamplifier module with very accurate RIAA equalization and many features. It is realized with the best semiconductors available and non-inductive, low noise, SMD metal film resistors. The circuit is designed to accept both moving coil (MC) and moving magnet (MM) transducers/cartridges directly in order to eliminate the need for an external MC step-up transformer or amplifier. MC/MM input loading and input nominal level values are easy to select with high resolution by DIP-switches.

Danish Audio ConnecT A/S
Skannerupvej 14, DK-6980 Tim, Denmark.

Friday, May 23, 2008

PIC101 - PIC Educational Site

Here you find Rick's PIC and DIY "How to" ... make quality printed circuit boards and Circuit board layout checklist. See also the Schematic layout checklist.

PIC101 - PIC Educational Site

Rick C.

Embedded HobbyCorner - Ben

Embedded HobbyCorner - Ben

This is a board from VA3TO/Hugh Duff with a RTL8019as Ethernet controller and an ATMega16. Programmed in Bascom-AVR as an Embedded Web Server. Surfing to the board lets you switch on/off 4 relays, and read 4 opto-coupler-inputs.

Thursday, May 22, 2008

Radio-Electronics and Popular Electronics - SWTPC

SWTPC Computer Documentation Repository Radio Electronics June 1949, Guitar Preamp

This site's purpose is to address the lack of technical information for some of the rarer vintage computers and related peripherals, with a strong focus on SWTPC.

More than 600 pages of assembly instructions, schematics, program listings, catalogs, photos and much, much more!

K8CU -Bill Jones

K8CU -Bill Jones

Bill Jones, K8CU, has been an active Radio Amateur, CW Dxer, and home project builder since first receiving his Amateur Radio license in 1966 at age 17. Bill is an electronics professional with four-decades of experience.HV Regulator PC board

High voltage regulated power supply for RF amplifiers. This is an enhancement of the article by VE6AXW in July/Aug 1999 QEX. I have redrawn the schematic for clarity, added EMI filtering, included a programmable power on timer, and generated a printed circuit board layout. Works for most voltage values.

SchmartBoard - Circuit prototyping system

SchmartBoard - Circuit prototyping system

The SchmartBoard system is the fastest and easiest electronic circuit prototyping system ever conceived. The system supports through hole and surface mount components.

Friday, March 21, 2008

Radio Controlled Modeling - RC Circuits

Radio Controlled Modeling - RC Circuits

PIC Assembler Projects, PIC Assembler Modules, Electronic Circuits, Student Projects, R/C Modeling Circuits, Servo Checker. Projects of Peter Luethi - Switzerland.


"The current concept incorporates a wireless transmitter and receiver and is thought to be used for remote controlled airplanes or appliances with two seperate parts."

Thursday, March 20, 2008

Flinn Scientific - Science Activities

Flinn Scientific - Science Activities

Sells educational science supplies. Site has especially useful information on lab safety and lab design.

Physical Science Activities - Exciting experiments which illustrate important scientific concepts and are exciting for both you and your students

Sunday, February 03, 2008

Twisted Pair - Learn Electronics Lessons

Learn Electronics Lessons and Information Pages

Find tools to help you work with resistors, capacitors, inductors, FETs, transformers, diodes, transistors, digital logic, TTL and CMOS devices. Learn how to use these in both AC and DC series, parallel and complex circuits. Explore Ohm, Kirchhoff and DeMorgan.

  • Capacitor Identification Codes
  • Metric Prefixes in Electronics
  • Dictionary of Electronics Terms
  • Circuit Analysis Puzzles
  • Ohms and Kirchhoff's

Saturday, February 02, 2008

PY2WM JK De Marco Projects

An Amateur Radio Enthusiast from Brazil. JK De Marco. In these pages Hams will find his ideas on QRP, Antennas and Complete circuits.

PY2WM JK De Marco Projects



A 40 dB RF Attenuator

"To measure power of a high power transmitter, or to be able to observe the output signal on an oscilloscope or spectrum analyzer, it is necessary that the signal is attenuated in accordance with the instrument, while it must be ensured that the transmitter is "seeing" the correct impedance. So it requires an attenuator that works with three ports (input, output, and output attenuated), all while maintaining the correct impedance of 50 ohms.

The circuit assembly and is shown here in EMRFD and also in the QST. When properly calibrated can be used for precision measurements in section 0-500 MHz, or a a calibration capacitor C1, can be used for the range of 0-50 MHz with reliability."

Other Projects and Ideas
  • Simple Homebrew Coil Winding Machine
  • Qrp-Br Spectrometer
  • Simple ESR meter
  • Swr Power Measuring mW To KW
  • 5 Volts Reference Voltage Calibrator

Learning Circuits learn electricity

Learning Circuits learn electricity

If you are aged between 8 and 10 and wanting to learn about electricity and circuits then this is the place for you. Learning Circuits will guide you through 6 tutorials and then quiz you to test your knowledge.

Electricity and Circuits reinforces what your children learn from Physics at School, it takes the form of a virtual learning environment which reinforces Sources of Electricity, Circuits and Conductors, Changing Circuits andCircuit Diagrams.

Thursday, January 17, 2008

MAKE Magazine DIY technology projects

Devoted entirely to DIY technology projects, amazing projects for home, backyards, basements, and garages.
MAKE Magazine and DIY Kits
MAKE brings the do-it-yourself mindset to all the technology in your life. MAKE is loaded with exciting projects that help you make the most of your technology at home and away from home. This is a magazine that celebrates your right to tweak, hack, and bend any technology to your own will.
Then there is the Maker SHED. When you give gifts, give something to inspire them to build their skills and learning. You can buy some of these yourself, to use up the spare time constructively. Hobby DIY is learning, skill building, physical and mental exercise. It makes you an healthy and happy individual. It saves cost too …. you will buy things prudently and handle them with care and fix them when they go bad. This is only Because …. you know, what makes them spin and rattle.

Make: Electronics Deluxe Toolkit

Instructables - The Worlds Biggest DIY and How To

"Instructables is a web-based documentation platform where passionate people share what they do and how they do it, and learn from and collaborate with others. The seeds of Instructables germinated at the MIT Media Lab as the future founders of Squid Labs built places to share their projects and help others."
instructables.com-category-tech

Instructables - The Worlds Biggest DIY and How To

Vintage Radio Information

Vintage Radio Information

This website is a repository and archive for a range of documents and other material of interest to collectors of vintage radios. - Paul Stenning

Friday, January 11, 2008

4QD-TEC: Electronics Circuits Reference Archive

4QD-TEC: Electronics Circuits Reference Archive|

4QD-TEC: Electronics Circuits Reference Archive.
  • Electricity - an analogy with water
  • LED VU meter
  • Colour codes and multipliers
  • Logic circuits using discretes
  • Gyrator - used in graphic equaliser
  • Thermometer and thermostat
(Design with discretes, Make basics sound, 4QD-TEC will show how in circuit examples - delabs)

Friday, January 04, 2008

Lars Petersen OZ1BXM QRP Denmark

Amateur radio homepage by Lars Petersen of Holstebro, Denmark. The Useful Articles include some good rules for the QRPer and Main HF rig and antenna.

Lars Petersen OZ1BXM QRP Denmark
 
CW, QRP, and satellites. Satellite radios and PIC experiments like the one below. The K3 testboard for 16F873

Lars Petersen OZ1BXM QRP Denmark

The main components are: A 7805 bolted to a small heatsink, a blue reset button, a red LED, a serial I2C EEPROM (24LC256), four DIL switches, the 16F873 with 4 MHz crystal oscillator, a real time clock (DS1302) with lithium battery backup and a MAX232 for serial communication. I'm using an external power supply which is able to provide 12V DC at 300 mA.
 
Ham radio blog by OZ1BXM
 
SSPA for 2 meters - 1 kW module - The core of the SSPA is the 1 kW amplifier module. The module is built around the LDMOS transistor MRFE6VP61K25H from Freescale. This device can operate between 1.8 MHz and 600 MHz and delivers 1250 W output. In this application, the output is limited to 1000W.

Thursday, January 03, 2008

QRP Homebuilder Short Wave Radio

Amateur and Short Wave Radio Electronics Experimenter's Web Site

QRP Homebuilder VE7BPO - Radio Design

"The QRP/SWL Homebuilder site is owned and maintained by VE7BPO. The purpose of this website is to promote experimentation with relatively simple radio electronic circuits. Please keep in mind that I am a novice, lay person experimenter, not an engineer. "

  • Popcorn DC Receiver Mainframe
  • 40 M popcorn Superhet Receiver
  • Crystal Oscillator Frequency Offsets
  • Broadband Transformer Topics
  • Powdered Iron Torroidal Coating
  • Astable Multivibrator Circuits
  • W7ZOI JFET Biasing Tutorial

VE7BPO - Amateur Radio and Electronics

LEDs Page

How to Learn Hobby Electronics

VE7BPO has a way of presenting easy steps towards your Hobby Lab. It is Ham or Amateur Radio DIY Community that caused the outbreak of Electronic Hobbyist Activity the world over, long ago.

Here the Two Transistor Astable Multivibrator for flashing LEDs, that got popular after low priced Plastic Silicon Transistors became available, Superseding Metal Germanium ones.

More LED Flashers