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A Feature-Rich Drum Machine

A little over a month ago, we featured a project from [Igor] who built 64 bits of DRAM from scratch using discrete components. Jokes about memory pricing aside, he did have a use case for such a small amount of memory β€” he is using it in a custom-built drum machine. But featuring the memory build and not the drum machine was perhaps putting the cart before the horse, so in this video, [Igor] shows off the construction of each part of his impressive 16- or 64-step sequence drum machine.

This isn’t Igor’s first drum machine, either, although his previous build was a bit more limited. It had fewer steps in the sequence and didn’t quite have the range of his newer model. The upgraded version can play more steps but also includes force-sensitive drum pads based on piezo sensors and more voices (drums) as well. Each voice is built electronically using various op-amps and passive components, and [Igor] has the schematics for each of them, as well as every other part of the drum machine, for those looking to recreate any part of this on their own. There’s a lot going on in this lengthy video as well, so for the musically inclined, it’s worth taking a look in full.

Now that our horse is in the correct position in front of the cart, it’s worth going back and looking at the memory build if you missed it when it first ran. A small amount of memory makes the machine programmable rather than just playable, and truly expands the capabilities of a machine like this in the recording studio.

4 free tools I keep on my USB drive to fix any Windows PC

I’ve spent more hours than I care to admit diagnosing stubborn Windows problems: sluggish laptops, desktop crashes, weird startup behavior, you name it. Over the years, I’ve used plenty of different tools, from flashy β€œPC optimizers” that promise too much, to hidden system utilities that actually deliver. What I’ve learned is that many of the best ones are lightweight, reliable, and give you a clear view of what’s really happening under the hood, so to speak.

4 uncomfortable truths about Home Assistant

Home Assistant is, in my opinion, the best smart home software available. It's free, open-source, privacy-focused, works with a huge number of devices, and can make your smart home do almost anything you can think of. Despite all that, Home Assistant definitely has its faor share of problems.

You’re storing your power tool batteries wrong. Here’s how to make them last longer

Whether you have a garage full of Ryobi tools, a work truck packed with Milwaukee or DeWALT, or use any other major power tool brand, you know that the battery packs are just as important as the tools. They're expensive, too. And chances are, you're not storing them right. Thankfully, a few new habits or systems can extend runtime and prevent premature failure.

Full Body VR Tracking Is Just Some Recycled Hardware Away

Full body tracking in VR applications involves attaching sensors to one’s body, and [Jaki] has a DIY method to do it on the cheap: the Vive Tracker Lite project repurposes Vive controllers as lighthouse-based trackers, no hardware modifications required.

A common method of doing body tracking is to strap on some Vive trackers. Those are extremely hacker-friendly pieces of hardware, but [Jaki] observed that older Vive VR controllers can be had for cheap, and already contain everything a tracker needs. Some new firmware and a custom mount is all it takes to turn them into perfectly usable body trackers.

But what about a wireless receiver? [Jaki] has that covered as well with the $5 Viva Dongle, which uses a Pro Micro NRF52840 to act as a cheap DIY alternative to the official dongle hardware.

We appreciate the effort put into making this project accessible to everyone, even novices. [Jaki]’s put effort into a Python program with a full GUI to make the flashing of firmware as easy as possible for both projects. Experimenting with body tracking in VRChat or games with mods is just some recycled hardware away.

Granted, a Vive controller is not the slimmest piece of hardware, but all it takes is a firmware change and a 3D-printed fixture to make a perfectly serviceable tracker. That being said, we’re sure an enterprising hardware hacker may crack a controller open and embark on a serious rebuild, or even interface to some of the inputs in a clever way. If you’ve done that or know of someone who has, drop us a note on our tips line because we’d love to see it.

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