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DIY Synth Series Part 1 — The Exponential VCO

Build a 1V octave voltage-controlled oscillator (VCO) module and create your own analogue synth sounds.

August 08, 2016 by Robin Mitchell

How to Build an Arduino-Controlled AM/FM/SW Radio

Combine the Si4844-A10 analog-tuned radio receiver with an Arduino to make a full-featured multiband radio.

May 26, 2016 by Raymond Genovese

Inductor Out, Op-Amp In: An Introduction to Second-Order Active Filters

In this article, we’ll compare active and passive filters and look at some common second-order active topologies.

May 19, 2016 by Robert Keim

Create a Laser Detection System Using a PICAXE

Lasers are plentiful, inexpensive, and fun to use. Here's a target that reacts when it's hit by a laser beam.

February 16, 2016 by Charles R. Hampton

Why the Capacitor in Your Power Supply Filter is Too Big

The job of the capacitor in the output filter of a DC power supply is to maintain a constant DC value by removing as much power ripple as possible. Because these capacitors have a DC value, they are actually storing a lot of energy that never gets used.

January 21, 2016 by David Williams

AC-DC Converters - Disassembling a Linear Power Supply

An AC-DC wall adaptor gets disassembled to see what components are used to build it, then the purpose of each component is analyzed.

December 22, 2015 by David Williams

Design a Luxmeter Using a Light Dependent Resistor

Take a few minutes to characterize a light dependent resistor (LDR) and you can build a simple and reasonably accurate light meter can be built using an LDR and an Arduino.

December 13, 2015 by David Williams

Practical PCB Layout Tips Every Designer Needs to Know

This article contains practical PCB layout tips that can help your PCB projects work correctly and reliably.

November 13, 2015 by David Knight

Understanding Electricity with Hydraulics

An overview of how the concepts of electron flow and the role of individual circuit components can be related to the flow of fluid in pipe networks. The analogy between hydraulics and electricity is a useful tool for teaching and for those who are struggling to understand how circuits work.

November 13, 2015 by Trevor Gamblin

Make an Analog Sound Reactive LED Strip

This analog design allows your LEDs to respond to your music. Just plug your music source into this which sends a channel to your sound system and some LEDs.

October 28, 2015 by Fadi Kasem

Choosing and Using Ferrite Beads

This article provides practical guidance on using ferrite beads to improve your PCB’s power quality.

October 11, 2015 by Robert Keim

Learning to Simplify: Thevenin and Norton Equivalent Circuits

This article reviews the basics of finding Thevenin and Norton equivalents and discusses how to apply Thevenin's theorem to a practical circuit.

October 01, 2015 by Robert Keim

Clean Power for Every IC, Part 3: Understanding Ferrite Beads

Ferrite beads used in conjunction with bypass capacitors can provide improved power-supply filtering and decoupling.

September 30, 2015 by Robert Keim

Clean Power for Every IC, Part 2: Choosing and Using Your Bypass Capacitors

Proper component selection and careful PCB layout are integral to power supply bypassing.

September 27, 2015 by Robert Keim

Clean Power for Every IC, Part 1: Understanding Bypass Capacitors

A thorough understanding of bypass capacitors will help you to properly incorporate these critical components into your designs.

September 21, 2015 by Robert Keim

Writing PICAXE BASIC Code - Part 4

Part 4 introduces the readadc, select, case, and endselect PICAXE BASIC commands. It is the fourth article in a multi-part series on writing PICAXE code.

September 16, 2015 by Charles R. Hampton

Writing PICAXE BASIC Code - Part 1

This is the first in a multi-part series on writing PICAXE BASIC code. This article covers how to read PICAXE pin-out diagrams, a circuit for coding practice, and the general program format.

August 25, 2015 by Charles R. Hampton

An Introduction to Negative Impedance Converters

An introduction to the properties and purposes of a negative resistance device. Later articles will extend to negative impedances and some applications.

August 13, 2015 by Trent Ziemer

Build an Audio Mixer

You and your friends are planning the greatest party your hometown has ever seen. Just one problem: you don't have a karaoke system. What's a great party with no karaoke? We're about to fix that. All you need are a few potentiometers and an op-amp.

August 11, 2015 by Jacob Smith

Basic Circuit Simulation with LTspice

LTSpice is a versatile, accurate, and free circuit simulator available for Windows and Mac. This is an overview of AC and DC simulation, as well as how to analyze output signals.

July 30, 2015 by Trevor Gamblin