Latest Microphones Projects

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Build Your Own LED Saber—Firmware, Microcontroller, and Testing

In part 3, we compile the firmware and build the controller at the heart of the Saber, then do initial testing and diagnostics.

October 20, 2016 by Jeremy Lee

Build Your Own LED Saber—Audio and Power Systems

In part 2 of the LED saber project, we'll assemble the power and audio systems.

October 19, 2016 by Jeremy Lee

How to Build the Brightest LED Saber in the World

The brightest blade in the world. Fluid sound effects generated in real time. Any colour, changeable on the fly. If you want to know what it feels like to hold a Lightsaber, this project is the closest you can get today.

October 18, 2016 by Jeremy Lee

The Crop Duster Buster! A Launchpad-Controlled Clapper

The Crop Duster Buster is sure to keep your pet's toot smell away!

September 26, 2016 by Ryan Jones

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

The Quark D2000 Development Board: Moving Beyond “Hello World”

Start to get acquainted with the new D2000 microcontroller development board by exploring the GPIO and PWM.

July 12, 2016 by Raymond Genovese

AC/DC: Battery Power Conversion for AC Speakers (Part 1)

This project details the process by which AC-powered speaker sets can typically be converted to battery power. I'll detail my own projects and provide advice for converting almost any set of speakers.

June 08, 2016 by Seth Schaffer

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

Digital-to-Analog Conversion with the SAM4S Peripheral DMA Controller

Part Three in this three-article series shows you how to generate values for a discrete sinusoid and continuously convert this data into an analog signal without overburdening the CPU.

May 09, 2016 by Robert Keim

Understanding and Using the SAM4S Digital-to-Analog Converter

Part Two in this three-article series explores the SAM4S DAC. We’ll look at hardware configuration, electrical characteristics, and the application programming interface.

May 04, 2016 by Robert Keim

DMA Digital-to-Analog Conversion with a SAM4S Microcontroller: The Timer/Counter

Part One in this three-article series focuses on using the SAM4S timer/counter peripheral to precisely control the DAC’s sampling rate.

April 28, 2016 by Robert Keim

How to Eliminate Ground Loops with Signal Isolation

This project explains how to isolate signals to eliminate ground loops in electronic systems.

January 29, 2016 by Orrin Bigelow

Make Your Switch Sound Activated

In this article, we'll build a sound-activated switch that can be opened and closed with a double clap.

December 21, 2015 by Tim Youngblood

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

Build a Laser Communication System

Use a laser and a photo resistor to build a laser based point-to-point communication system. The best part? It's under $10.

October 22, 2015 by Jacob Smith

EFM8 Sound Synthesizer: Playing Melodies via USB

Part 3 in the “How to Make an EFM8-Based Sound Synthesizer” series.

September 17, 2015 by Robert Keim

EFM8 Sound Synthesizer: Driving the Speaker

Part 2 in the “How to Make an EFM8-Based Sound Synthesizer” series.

September 11, 2015 by Robert Keim

EFM8 Sound Synthesizer: From Square Wave to Sine Wave

Part 1 in the “How to Make an EFM8-Based Sound Synthesizer” series, which will design a sound synthesizer that can play standard musical notes. We will accomplish this using a low-cost, small-form-factor EFM8 microcontroller in conjunction with a few external components and a speaker.

September 04, 2015 by Robert Keim

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

Build an Audio Detector

Detect audio with an electret microphone and a TI CC3200 Wifi microcontroller. This handy project will allow you to set up an audio detection device that can be used to catch your roommate stealing things from the fridge or send you an alert if the noise in your room goes above a certain threshold.

August 09, 2015 by Travis Fagerness