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…
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…
A Critical Short Pulse
While there are maximum limitations of a duty cycle, which will be discussed separately, this power management tip focuses specifically…
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...
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…
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…
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…
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…
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,…
Variable gain superbal circuit preserves CMRR
This adaptation of a superbal circuit allows for adjustable gain without CMRR degradation.