The game of Tic-Tac-Toe has been around for centuries. With all the electronic games kids play with today, it’s unlikely that you’ll see “gamers” stampeding to play an old pencil and paper game. So, let’s update the old game a bit to make it a little more attractive to the “blue screen” generation – young and old.
Listening to the heart (cardiac auscultation) is a frequent first step in diagnosing heart disorders. Here, we describe a very inexpensive system for digital cardiac auscultation (digital phonocardiography) using a Windows laptop computer, freely downloadable software, and a low-priced USB microphone.
Light up your living space with a customizable motion-activated nightlight. Use this as a working product in your home to safely light your way in the dark, or as an educational project for your children or grandchildren.
Do you remember the logic puzzle about the Farmer who wanted to transport his animals and produce across a river without them eating each other? The puzzle was deceptively simple. Well, I’ve created an updated version of this popular game using an Arduino, plus added my own bells and whistles.
This article describes the process of designing and building a custom Raspberry Pi HAT circuit board. This HAT works with a Python script to record and live plot battery voltage, temperature, and capacity. The ability to log data over an extended period is an included useful feature.
This article describes the theory, construction, and final project functionality of a musical circular harp that utilizes an off-the-shelf concert organ which provides 160 possible instrument sounds and full MIDI capability. Plus, it looks really neat.
What could be more fun than building a miniature oscilloscope? Not one with an LCD screen, but a scope with a real live cathode ray tube just one inch in diameter. All the parts -- including two 6AU6 vacuum tubes -- will be housed in a 5” x 7” x 2” box.
The last few years have seen a massive resurgence in the popularity and availability of voltage-controlled synthesizers. The very simple ribbon controller we’ll construct in this article will be used to control any of the myriad voltage-controlled modulation opportunities provided by the typical voltage-controlled synth.
In Part 1 of this series, I covered basic sweep alignment theory and construction/operation of an all-in-one sweep alignment instrument I dubbed the WhippleWay Sweep Alignment Board (or WSAB for short). In Part 2, I’ll describe sweep alignment procedures for AM and FM radios and give an actual example of each.
DC-to-DC (DC-DC) converters are a common part of modern electronics. The need for an “odd” voltage can arise for biasing, backlighting, analog components, communications, or — as in the case of the LP130 discussed in the last issue — programming and verification. If your main circuit is powered from +5V and you have a few chips that need 3.3V, a simple linear regulator will suffice. However, linear regulators can only reduce the supplied voltage. Most practical DC-DC converters are a type of switching regulator and in this article, DC-DC converter means a switching type of regulator.
