Category Archives: how-to

Lock In Amplifiers

If you have about an hour to kill, you might want to check out [Shahriar’s] video about the Stanford Research SR530 lock in amplifier (see below). If you know what a lock in amplifier is, it is still a pretty interesting video and if you don’t know, then it really is a must see.

Most of the time, you think of an amplifier as just a circuit that makes a small signal bigger in some way — that is, increase the voltage or increase the current. But there are whole classes of amplifiers designed to reject noise and the lock …read more

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Posted in amplifier, filter, Fourier, how-to, lock in amplifier | Leave a comment

Scooter Wheels Keep DIY Barn Doors on Track

[MotoGeeking] built a giant spray booth and is in the process of making customized, air-filtering barn doors for it. When it came to buy hardware to move the doors, though, he found all the ready-made options to be prohibitively expensive. You know what comes next: he designed barn door hardware from the ground up, and did it as cheaply as possible.

After intensely studying many images of barn doors and hardware, [MotoGeeking] decided on the right wheels and went from there. Kick scooter wheels fit the bill nicely, since they are designed to support a lot of weight and come …read more

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Posted in barn doors, design, DIY build, hardware, how-to, razor scooter | Leave a comment

Mouse Mis-Clicking? We Got You.

A mouse with malfunctioning buttons can be a frustrating to deal with — and usually a short leap to percussive maintenance. Standard fixes may not always last due to inferior build quality of the components, or when the microswitch won’t close at all. But, for mice that double/triple-click, will release when dragging, or mis-click on release, this Arduino-based hack may be the good medicine you’re after.

Instructables user [themoreyouknow]’s method cancels click malfunctions by latching the mouse’s controller switch trace to ‘on’ when pressed, keeping it there until the button normally closed contact closes again completely. Due to the confined …read more

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Posted in arduino, Click, debounce, hardware, how-to, mouse, nano, repair | Leave a comment

Live Stream to YouTube by Pointing a Box and Pressing a Button

YouTube has the ability to do live streaming, but [Tinkernut] felt that the process could be much more straightforward. From this desire to streamline was born the Raspberry Pi based YouTube live streaming camera. It consists of a Raspberry Pi with some supporting hardware and it has one job: to make live streaming as simple as pointing a box and pressing a button. The hardware is mostly off-the-shelf, and once all the configuration is done the unit provides a simple touchscreen based interface to preview, broadcast live, and shut down. The only thing missing is a 3D printed enclosure, which …read more

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Posted in camera, digital cameras hacks, diy, how-to, Raspberry Pi, software, streaming, touchscreen, youtube | Leave a comment

A Great Way to Make Quick and Easy Knobs

Here’s a great way to quickly and easily make attractive and functional knobs with no tools required. All you need is some casting resin (epoxy would do in a pinch), a silicone mold intended for candy, and some socket head bolts. With the right preparation and a bit of careful placement and attention, smooth and functional knob ends are only minutes away. Embedded below is a short video demonstrating the process.

These may not replace purpose-made knobs for final products, but for prototypes or to use around the shop on jigs, clamps, or furniture they certainly fit the bill. With …read more

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Posted in bolt, casting, diy, epoxy, how-to, knobs, mold, resin, silicone, socket head bolt, threaded knob, tool hacks, tool-free | Leave a comment

Clever Battery Holder Hack Makes Brilliant Earrings

We love seeing a thing get used effectively for other than its intended purpose, and this DIY LED Earrings project is a great example. [IdunnGoddess] liked the idea of making light-up LED earrings powered by a small coin cell, but an enclosure and power connection for the battery were sticking points. The solution? A googly eye after a few minor modifications turned out to be perfect.

A googly eye resembles a thin, flat, hollow plastic bulb. Choose one that’s just a bit bigger than the coin cell, and cut a slot in one end and a small hole in the …read more

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Posted in coin cell, diy, earrings, fashion, googly eyes, how-to, led, led hacks | Leave a comment

Building A Motorized Barrel Boat

[Rinoa Super-Genius] shows us in a video how to build a crude motorized barrel boat using only a few parts, including pontoons for extra buoyancy and stabilisation.

Building a barrel boat is simple. All you really need is a plastic barrel, scrap wood, PVC pipe with end caps, a battery, and a trolling motor. Of course, you could go even further and build your own trolling motor too.

The video shows the process of building the boat. You start of by cutting the barrel in two, making some calculations of water displacement in order to add the pontoons in the …read more

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Posted in barrel boat, boat, DIY Boat, how-to, scrap build | Leave a comment

Bessel Filter Design

Once you fall deep enough into the rabbit hole of any project, specific information starts getting harder and harder to find. At some point, trusting experts becomes necessary, even if that information is hard to find, obtuse, or incomplete. [turingbirds] was having this problem with Bessel filters, namely that all of the information about them was scattered around the web and in textbooks. For anyone else who is having trouble with these particular filters, or simply wants to learn more about them, [turingbirds] has put together a guide with all of the information he has about them.

For those who …read more

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Posted in analog, audio, bessel, design, digital audio hacks, filter, guide, how-to | Leave a comment

Edge-lit Pendants Show Two Layers are Better Than One

Engraved acrylic lights up nicely with LED lighting. Simply engrave clear acrylic with a laser engraver, then edge-light the acrylic and watch the engraving light up. This badge made by [Solarbotics] shows how they used this principle when creating some pendants for an event that performed particularly well in the dark.

The pendants they created have two engraved acrylic panels each, and that’s about it. Two LEDs and a CR2032 battery nestle into pre-cut holes, and the engraved sides are placed face-to-face, so the outer surfaces of the pendant are smooth. By using some color-cycling RGB LEDs on one panel …read more

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Posted in acrylic, badge, coin cell, cr2032, edge lighting, edge-lit, how-to, instructable, Laser cutting, laser engraving, laser hacks, led, led hacks, pendant, rgb | Leave a comment

Make Your Own Reed Switches

[Lucid Science] shows us how to make some simple reed switches. Reed switches are simple components that detect a magnetic field and can close or open a circuit once detected. While not really a thing of beauty, these DIY reed switches should help you out if you just can’t wait to order some or you fancied trying your hands at making some components from scratch.

Reed switches normally come in very small form factors so if you need something small then this may not be for you however the video does show you on a macro scale the fundamental workings …read more

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Posted in component, components, how-to, magnetism, parts, reed switch, reed switches, switches | Leave a comment