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Learn About Electronics – Eric Coates

Many pages, illustrations and Interactive demonstrations in Electronics. A new section on AC electronics, designed to teach the basics of AC Theory in 10 easy to learn modules. Individual topics too like capacitors, inductors, reactance, impedance, etc.

Learn About Electronics – Eric Coates

The Step-by-Step Lessons in Electricity and Magnetism is very simple and full of nice Explaining Pictures. This will work up your appetite to learn more about the Physics and Chemistry in Electronics.

Learn About Electronics - Eric Coates

Eric Coates has 26 year practical career in electronics, and 17 years as a lecturer in vocational colleges in the UK.

Learning about electronics? Here you will find full and easy explanations of how components and circuits really work; animations to make transistor operation clear and stuff you need to know about digital electronics

Aaron Cake Basic Electronics

Aaron Cake has many basic electronic circuits and other electronics information in his archive that is online since the 90s. Antique electronics and Parallel Port Programming.

Aaron Cake Electronics

Aaron Cake Basic Electronics

The Schematic Symbol Reference, How To Solder and Desolder helped many electronic beginners in building their Projects. This was a valuable resource in those days even though it appears common today. The internet was used to genuinely share useful learning and ideas.

Some highlights are circuits on Power Supplies, a 120VAC Inverter, FM Transmitter, Automatic Headlight Brightness Switch, Car Alarm  and a Wireless Auto Tachometer. see also the Simple Colour Organ and the Solid State Tesla Coil.

Piezoelectric Crystal Oscillators

Crystal Oscillators are the Time Base on a wristwatch or a home clock, analog or digital, Mechanical clocks have become rare due to the Maintenance and Accuracy. Some crystals can change dimensions on a electric force, some generate electricity on Mechanical Strain.

Crystal Oscillator – Parallel Resonant

Ceramic Resonators – “The ceramic components are made of high stability piezoelectric ceramics that functions as a mechanical resonator. The frequency is primary adjusted by the size and thickness of the ceramic element.”

Piezoelectric Crystal Oscillators

 

In the mechanical gramophone a metal needle and a horn would amplify the sound. When Record players came, the use of magnetic pickups made the needle size a bit smaller but the signal was weak. The crystal type pickups made the needle thinner and the electricity generated by crystal moving on the grooves was large, in mV. A preamp was rarely required. But Equalization preprocessing of audio was needed, to match the ear response. The electric gramophone made LP or Long Playing Record Players possible. It is analogous to DVD having more capacity than CDROM.

Crystal Oscillator – Wikipedia

“When a crystal of quartz is properly cut and mounted, it can be made to distort in an electric field by applying a voltage to an electrode near or on the crystal. This property is known as piezoelectricity.”

Crystals and Their Applications

Introduction to Quartz Frequency Standards – More than one billion quartz crystal oscillators are produced annually for applications ranging from inexpensive watches and clocks to radio navigation and spacecraft tracking systems.

Microcontroller Clock-Crystal, Resonator. – rystals, ceramic resonators, RC (resistor, capacitor) oscillators, and silicon oscillators are four types of clock sources for use with a microcontroller (µC). The optimal clock source for an application depends on many factors including cost, accuracy, and environmental parameters.

Crystal Oscillator Tutorial Articles – Types of Crystals and oscillators, Frequency and  relationship with Temperature, Aging and Stability of the clock.

Technical Literature – Frequency Electronics Inc. – New discoveries, research and development information, and scholarly works from some of the engineers and scientists in the FEI family,

Make a Shake LED Flashlight

I  was enlightened about this Battery Less wonder. This is a boon for rural areas and an emergency tool which depend only on your will and your tendons. I found this bright flash of information when i was looking for supercap vendors.

Learn about Supercaps, dynamo and White LED

Richard J. Nelson on the LED Forever Flashlight. – The future of low power lighting is in the use of the Light Emitting Diode, LED. Sooner or later you will buy one or more LED lights or lamps. The two primary advantages of an LED light source is it’s efficient light generation (exceeding that of fluorescent lamps) and long life, typically 100,000 hours. That is 50 to 100 times more life than most of the bulbs in your house.

Learn about the Eternal Torchlight

This is a Linear Dynamo LED Torch which uses a SuperCapacitor to store the energy. Easy to repair and maintain if necessary.

It uses no batteries and requires only the single LED included. You can even leave the flashlight unused in your car’s glove box for years and you’ll always get that all-important light when you need it most. Forever Flashlight lll pays for itself quickly by saving you the cost of batteries and bulbs.

Raspberry Pi a teeny weeny Computer

Raspberry Pi is a Miniature Computer that can Interface with a Display Device like TV and a keyboard.

Raspberry Pi a teeny weeny Computer

Model A has been redesigned to have 256Mb RAM, one USB port and no Ethernet (network connection). Model B has 256Mb RAM, 2 USB port and an Ethernet port.

The Raspberry Pi measures 85.60mm x 53.98mm x 17mm, with a little overlap for the SD card and connectors which project over the edges. It weighs 45g.

Raspberry Pi a teeny weeny Computer

The SoC is a Broadcom BCM2835. This contains an ARM1176JZFS, with floating point, running at 700Mhz, and a Videocore 4 GPU. The GPU is capable of BluRay quality playback, using H.264 at 40MBits/s. It has a fast 3D core accessed using the supplied OpenGL ES2.0 and OpenVG libraries.
Overall real world performance is something like a 300MHz Pentium 2, only with much, much swankier graphics.

There is composite and HDMI out on the board, so you can hook it up to an old analogue TV, to a digital TV or to a DVI monitor. No VGA support.

Hobby Circuits – Bill Bowden

Bill Bowden’s Circuits is one of the oldest Web Reference, it was hosted by CompuServe homepages and later moved to his own domain website.

A small collection of electronic circuits for the hobbyist or student. Site includes over 100 circuit diagrams, links to related sites, commercial kits and projects, newsgroups and educational areas.

Hobby Circuits - Bill Bowden

Most of the circuits can be built with common components available from Radio Shack or salvaged from scrap electronic equipment…….

Hobby Circuits – Bill Bowden

Some of the Highlights in this website

  • 32.768 KHz Oscillator Using A Common Watch Crystal
  • 40 LED Bicycle Light (555 Timer – 6 volt)
  • Descrete LED fading circuit using 5 transistors
  • Mechanical Wall Clock Quartz Synchronizer
  • Neodymium Magnet Single Pole Motor
  • Variable Voltage and Current Power Supply
  • Micro Power AM Broadcast Transmitter

The Radio Electronics Magazine

Radio-Electronics was an American electronics magazine that was published under various titles from 1929 to 2003.You can Read them all here .

Radio Electronics Magazine at The Internet Archive

Recently i found a collection of those mags at Archive.org …..

Radio Electronics Magazine at Archive.org

Hugo Gernsback, sometimes called The Father of Science Fiction, started it as Radio-Craft in July 1929. The title was changed to Radio-Electronics in October 1948 and again to Electronics Now in July 1992. In January 2000 it was merged with Gernsback’s Popular Electronics to become Poptronics.

Gernsback Publications ceased operations in December 2002 and the January 2003 issue was the last.

Over the years, Radio-Electronics featured audio, radio, television and computer technology. The most notable articles were the TV Typewriter (September 1973)[1] and the Mark-8 computer (July 1974). These two issues are considered milestones in the home computer revolution.

Radio Electronics Magazine at SWTPC

Radio-Electronics was aimed at electronics’ professionals such as radio and TV repairmen. And they were men, the tag line on the cover was “For Men with Ideas in Electronics”.

Radio-Electronics & Electronics Now

Radio Electronics was the “new” name for Radio Craft magazine.. Hugo Gernsback, sometimes called The Father of Science Fiction, started it as Radio-Craft in July 1929. The title was changed to Radio-Electronics in October 1948. In July of 1992 transitioned to “Electronics Now