Bluetooth Wearable Becomes Rad Synth Controller

Once upon a time, a watch was just a watch. These days, though, smartwatches have all kinds of tricks built in, from heartrate sensors, to accelerometers, gyros, and tons of networking capability. …

No Inductors Needed For This Simple, Clean Twin-Tee Oscillator

If there’s one thing that amateur radio operators are passionate about, it’s the search for the perfect sine wave. Oscillators without any harmonics are an important part of spectrum hy…

A Practical Open Source Air Purifier

In the years since the start of the coronavirus pandemic, it’s fair to say we’ve all become a lot more aware of the air quality surrounding us. Many of us have added a CO2 monitor to ou…

Sailor Hat Adds Graceful Shutdown To Pis

Even though Windows and other operating systems constantly remind us to properly eject storage devices before removing them, plenty of people won’t heed those warnings until they finally corr…

Clean Water, From A Plant-Based Filter

If you’re an outdoors person, one of the earliest things you learned was probably that in-field water sources can’t always be trusted as drinkable. A clear mountain stream could have a …

Clean Up Your Resin-Printing Rinse With Dialysis

There’s a lot to like about resin 3D printing. The detail, the smooth surface finish, the mechanical simplicity of the printer itself compared to an FDM printer. But there are downsides, too,…

Low-Frequency DC Block Lets You Measure Ripple Better

We all know how to block the DC offset of an AC signal — that just requires putting a capacitor in series, right? But what if the AC signal doesn’t alternate very often? In that case, t…

A Loving Look Inside Vacuum Fluorescent Displays

Everyone knows we’re big fans of displays that differ from the plain old flat-panel LCDs that seem to adorn most devices these days. It’s a bit boring when the front panel of your widge…

How To Restore A Musical Amiga

Despite the huge strides in computing power and functionality that have been achieved in the past few decades, there are still some things that older computers can do which are basically impossible…

Pie Stop For Emergency DNS Needs

The war on Internet ads rages on, as the arms race between ad blockers and ad creators continues to escalate. To make a modern Internet experience even remotely palatable, plenty of people are turn…

Ham Radio Hacking: Thinking Inside The Box

There are two ways to deal with improving ham radio receivers, or — for that matter — any sort of receiver. You can filter and modify the radio frequency including the radio’s int…