2020-05-27 - Hesam Moshiri

DIY hand sanitizer/alcohol dispenser, without an Arduino or MCU

In this article, we will build an automatic hand sanitizer dispenser that uses IR sensors to detect the presence of…

2020-05-26 - Kendall Castor-Perry

Five things to know about prediction and negative-delay filters

How the heck can you build a filter that ‘predicts’ something? Well, it all depends on how high you set…

2020-05-19 - Frederik Dostal

A Critical Short Pulse

While there are maximum limitations of a duty cycle, which will be discussed separately, this power management tip focuses specifically…

2020-05-18 - Brian Dipert

Teardown: What makes the Amazon Fire TV Stick tick?

Cracking open the Apple Fire TV Stick is easy, but identifying all the components is a different story...

2020-05-12 - Kendall Castor-Perry

Analyze FIR filters using high-school algebra

This article looks at some fundamental facts about FIR filter responses, using some basic math you might even remember from…

2020-05-11 - Frederik Dostal

Quiet and efficient switching regulators

A major challenge for numerous applications is the interference inherent to a switching regulator because it can generate both conducted…

2020-05-11 - Brian Dipert

Why the Raspberry Pi 4 should catch your eye

If you’re basing your next system design on the Arm architecture, the Raspberry Pi Foundation’s various boards are an intriguing…

2020-05-08 - Bob Witte

Common op-amp circuits

These common op-amp circuits are useful for amplifying various analog signals. The ideal op amp model helps us understand how…

2020-04-06 - Bill Schweber

The Doppler Effect: Existed Before Railroads?

Of course the effect did exist before the railroads. However, it wasn’t yet defined by the physics of the day,…

2020-04-03 - Merlin Blencowe

Variable gain superbal circuit preserves CMRR

This adaptation of a superbal circuit allows for adjustable gain without CMRR degradation.