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A TRANSFORMER TUTORIAL

A TRANSFORMER TUTORIAL

Much as we learn about ourselves from our mistakes, we can learn a great deal about transformers from their imperfections.


The AC Volt
Theory

The AC Volt

In the US, the DC volt is legally defined by the Josephson array — a super conducting quantum device with a highly repeatable output voltage. Banks of standard cells and temperature-stabilized zener diode references are used by the National Institute of Science and Technology (NIST) to calibrate DC meters for scientific and industrial customers. So how is the AC volt defined?


ISaAC — A New Add-on Adapter for the Raspberry Pi
Control

ISaAC — A New Add-on Adapter for the Raspberry Pi

For quite a while now, we have sought the ultimate add-on interface board to enhance some Raspberry Pi (RasPi for short) projects we want to pursue, including a mobile webcam and a wireless sensor network. For such projects to work, it's essential that our RasPi add-on meet several particular criteria.


Build Your Own Induction Charger
Wireless

Build Your Own Induction Charger

As an avid hobbyist, I wanted a convenient way to recharge my battery powered projects without having to tie up the USB ports on my computer. Borrowing from the concept of the wireless chargers on the market, I decided to build my own. So if you like the idea of having a wireless replacement for your USB port, open up your surplus parts drawer and let's start the induction process.


A Recording Radiation Counter
Data Acquisition

A Recording Radiation Counter

Are you exposed? Build this unit to detect and display levels of radiation, plus you can record months of data to keep track of just how toxic areas may be or become.


Build the Solar Sequencer
Alternative Energy (Green)

Build the Solar Sequencer

Build a solar sequencer that enables a single solar panel to charge multiple batteries of different sizes and capacities, keeping them isolated from each other.


Build a Wall Wart Power Monitor
Workbench

Build a Wall Wart Power Monitor

As an experimenter, I use wall warts all the time to power circuit boards, microcontroller boards, and even finished projects. However, during the checkout phase of a new circuit, wall warts present a problem. How do you measure their output when they’re plugged into a board or project box?


Stand-Alone Watchdog Timers

Stand-Alone Watchdog Timers

Watchdog timers are an excellent way to insure that a microcontroller-based system continues to operate unattended if occasional failures occur. These circuits monitor the operation of the microcontroller and its software and restart it if a problem is detected.


Video Basics
Theory

Video Basics

Although there are many variations and implementation techniques, video signals are just a way of transferring visual information from one point to another. The information may be from a VCR, DVD player, broadcast channel, cable television, satellite system, the Internet, or one of many other sources.




Shop Best Sellers at the Nuts and Volts Store


Arduino Projects for Amateur Radio

Detailed instructions, helpful diagrams, parts and suppliers lists, and hardware and software tips make building your own equipment even more enjoyable. After all, isn't that what it's all about?

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Solar Sequencer PCB

Build a solar sequencer that enables a single solar panel to charge multiple batteries of different sizes and capacities, keeping them isolated from each other.

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Practical Electronics for Inventors, 4th Edition

Set up your own home electronics workshop and invent, design, build, test, and repair electronic circuits and gadgets.

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