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Signal Generators — Part 1
Workbench

Signal Generators — Part 1

Signal generators are devices used to make the signals used in testing and troubleshooting of radio receivers and other circuits, so are of primary interest to almost everyone interested in electronics.


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?


The DC Volt
Theory

The DC Volt

How many times each day do you pick up a probe to measure a DC voltage? The meter reads, say 4.65 volts, and we usually accept it without question. But just what is a volt and how is it maintained? Here's a fascinating look at the search for increasingly more accurate methods of building a “standard volt.”


Meet the ESP8266
Hardware

Meet the ESP8266

It’s not all that often that a new piece of hardware comes along that immediately captures the attention of the builder community. The ESP8266 is the newest example of this. It’s only about the size of a nickel, yet contains a powerful 32-bit microcontroller and a Wi-Fi interface, plus you can buy it for around $4.


The DHT22 Humidity/Temperature Sensor Demystified
Hardware

The DHT22 Humidity/Temperature Sensor Demystified

Keeping tabs on relative humidity and temperature is important in a variety of situations. The DHT22 is a recent contribution to the lineup of joint humidity/temperature sensors, and is particularly attractive to DIYers thanks to its low cost. Uncover its secrets to get it working for you.


The Edison Cell
Science

The Edison Cell

With the wild fluctuations in fuel prices over the last few years, world concern over global warming, and simply the idea of creating new and more sustainable technologies, immense interest and progress has developed recently in the world of battery development.


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?


A Nuts & Volts Designer’s Guide to Reliable Oscillators and Timers — Part 1
Theory

A Nuts & Volts Designer’s Guide to Reliable Oscillators and Timers — Part 1

Electronic designers are familiar with the apparent perversity of Nature in the tendency of amplifiers to oscillate and oscillators to amplify.


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Macchiato Mini Synth Kit

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