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The Basic MOSFET Constant-Current Source

The Basic MOSFET Constant-Current Source

Learn about a straightforward version of a circuit that is essential in the design of analog integrated circuits.


Bridge Amplifiers for Single-Supply Applications

Bridge Amplifiers for Single-Supply Applications

This article describes the bridge-amplifier configuration and explains why it’s especially handy when you don’t have a negative voltage supply.


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

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.


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

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.


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

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.


Projects May 09, 2016 by Robert Keim
Characteristics of the Ideal Silicon Diode

Characteristics of the Ideal Silicon Diode

In this article, we will discuss some characteristics of the ideal diode. We'll also learn how to analyze circuits that contain more than one ideal diode in conjunction with resistors and DC power sources.


Understanding and Using the SAM4S Digital-to-Analog Converter

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.


Projects May 04, 2016 by Robert Keim
Non-inverting Configuration of an Operational Amplifier

Non-inverting Configuration of an Operational Amplifier

Mentioned in the previous article, the first of two most commonly used operational amplifiers, the inverting configuration is heavily used in audio mixers or digital-to-audio converters. In this article, we will discuss the second amplifier configuration, known as the non-inverting amplifier.


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

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.


Projects Apr 28, 2016 by Robert Keim
Introducing the Intel D2000 Quark Microcontroller Developer Kit

Introducing the Intel D2000 Quark Microcontroller Developer Kit

The new development board features a 32 MHz Quark and a host of features at a $14.95 price tag.


The Inverting Configuration of an Amplifier

The Inverting Configuration of an Amplifier

Mentioned in the previous article, an operational amplifier is usually connected to components in a feedback circuit. In this article, we will discuss one of two amp configurations that are most widely used.


Characteristics of Operational Amplifiers

Characteristics of Operational Amplifiers

One of the reasons the operation amp (op-amp) is so reputable is because of its versatility. In this article, you will see that almost anything can be done using an op-amp. It is also notable that this integrated circuit has many characteristics that approach those that are considered to be ideal.


Linear Amplitude Modulation Applications

Linear Amplitude Modulation Applications

In this article, we'll delve into amplitude modulation and what it's used for. Also, we will differentiate between communication methods that do and do not use modulation.


How to Buffer an Op-Amp Output for Higher Current, Part 2

How to Buffer an Op-Amp Output for Higher Current, Part 2

In this article, we will look at two variations on the basic BJT current-buffering circuit.


How to Write Better Unit Tests For Embedded Software With TDD

How to Write Better Unit Tests For Embedded Software With TDD

Test-driven development (TDD) is an iterative process for writing software, where the unit tests are developed just before the implementation. TDD isn't used widely in embedded software, but it's the best way to get started with unit testing.


How to Eliminate Ground Loops with Signal Isolation

How to Eliminate Ground Loops with Signal Isolation

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


Projects Jan 29, 2016 by Orrin Bigelow
Make Your Switch Sound Activated

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.


Projects Dec 21, 2015 by Tim Youngblood
Negative Feedback, Part 10: Stability in the Time Domain

Negative Feedback, Part 10: Stability in the Time Domain

The transient response of a negative-feedback amplifier can help us to understand the nature of stability and convey useful information about the stability characteristics of a particular circuit.


Negative Feedback, Part 9: Breaking the Loop

Negative Feedback, Part 9: Breaking the Loop

A simple “break-the-feedback-loop” simulation technique makes for convenient stability analysis, especially with complex circuits.


An Intro to Adaptive Echo Cancellers

An Intro to Adaptive Echo Cancellers

A introduction to adaptive echo cancellers using Matlab simulation.