Conductive Paint Turns Pizza Box Into DJ Mixing Station

Conductive paints and inks have been around for quite sometime, and the internet abounds with examples of cool projects you can use them for. They’re well suited to quick and fun prototypes, educational workshops, and temporary toys. But, as cool as conductive paint is, it’s not usually the kind of thing that gets people excited at parties.

Well, until now that is. Adafruit has published a dope guide for building a bomb-diggity DJ mixing station out of a pizza box, conductive paint, and a Circuit Playground board. The guide walks you through how to properly apply the conductive paint (in this case using a stencil to lay it onto a cardboard pizza box), wire it up using the Circuit Playground, and integrate it into popular DJ software.

Sure, your sister’s “professional” DJ boyfriend may scoff at it, but it’ll still let you lay down some boss beats. And, when the bass drops nobody will care that you’re scratching a Domino’s box. Of course, there are other options out there if you want a more permanent solution.

A Beautiful Turntable With A Heart Of Concrete

On the face of it, playing a vinyl record is a simple process. You simply mount it on a turntable rotating at the right speed, and insert a needle into the groove. A learning exercise for youngsters used to be a passable attempt at a record player on the kitchen table with a pencil, a large cork, a sharpened matchstick, and a piece of paper. It sounded awful, but it demonstrated well how the audio was recorded.

If you have ever looked into the operation of a more conventional turntable though you’ll know that a little more care and attention is needed. There are many factors which affect the quality of the sound, and you quickly become obsessive about tracking, and sources of the tiniest vibration. Someone who has followed this path is [Mjhara], who has made a very high quality turntable. There is an unusual choice in this project: the tonearm is part of the build rather than fitting a commercial item like most turntable projects.

balanced-with-shotThe platter is machined from a piece of rosewood, weighted and balanced with lead shot, and laminated between two sheets of brass. It sits on a bearing aided by a ring of opposing magnets, and is belt driven by a two-phase induction motor. The base of the turntable is cast as a single piece of concrete, the idea being that the extra weight will aid the damping of vibrations. The tonearm is machined from a piece of wood, and its pivot from brass. The tonearm bearing is a ballpoint pen, a surprising yet inspired choice .

Sometimes audiophiles take their quest for better sound to extremes, and justification for their expenditure can be very subjective. But [Mjhara] assures us that this turntable has an exceptionally good sound, and it is certainly a thing of beauty. Full details are in the Imgur gallery embedded below the break.

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Turntable Turns Waveform Generator

In need of a waveform generator for another project, [David Cook] crammed out the old turntable to modify it for a handy hack: By adding a simple reflectance sensor to the pickup he turned it into a waveform generator that optically plays back arbitrary waveforms from printed paper discs.

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Hacked Turntable rotates humans for 3D scanning

If you are from the 70’s, you’ll probably remember the Disco Body Shaper or the Aerobic Body Shaper exerciser devices that were the rage of the day. Basically, Lazy Susan turntables on which humans could stand and twist away to burn fat. The results were suspect, but [Daniel Kucera] thought one of them would be ideal in 2016 to build a heavy-duty turntable to allow full body scanning.

He had already tried a few other ideas and failed, so it was worth giving this a shot, since it cost just 10 bucks to buy one. The plan was to use a motor to provide friction drive along the circumference of the turntable platform. For this, he used a high torque motor with a gear on the output shaft. From the looks of it, he attached a Meccano plate to the base, and mounted the motor to this plate. A large spring keeps the motor pressed against the rim of the turntable. A strip of rubber scavenged from a bicycle tube was glued along the side of the turntable to provide some friction to the gear drive. The turntable is placed on two thick pieces of foam, to provide clearance for the motor. We aren’t sure if a toothed gear is the best choice to drive this thing, but a hacker’s gotta use what he’s got. He’s clocking 190 seconds for a full rotation, but he still hasn’t posted any scan results from the Android scanner software that he is working on. This one, for sure, doesn’t qualify for a “it’s not a hack” comment.

Scratching Vinyl Straddles Physical and Digital Realms

The life of a modern DJ is hard. [Gergely] loves his apps, but the MIDI controller that works with the app feels wrong when he’s scratching, and the best physical interfaces for scratching only work with their dedicated machines. [Gergely]’s blog documents his adventures in building an interface to drive his iPad apps from a physical turntable. But be warned, there’s a lot here and your best bet is to start at the beginning of the blog (scroll down) and work your way up. Or just let us guide you through it.

In one of his earliest posts he lays out his ideal solution: a black box that interprets time-code vinyl records and emulates the MIDI output of the sub-par MIDI controller. Sounds easy, right? [Gergely] gets the MIDI side working fairly early on, because it’s comparatively simple to sniff USB traffic and emulate it. So now he’s got control over the MIDI-driven app, and the hard part of interfacing with the real world began.

After experimenting a lot with timecode vinyl, [Gergely] gives up on that and looks for an easier alternative. He also considers using an optical mouse, but that turns out to be a dead-end as well. Finally, [Gergely] settled on using a Tascam TT-M1, which is basically an optical encoder that sits on top of the record, and that makes the microcontroller’s job a lot easier. You can see the result in the video below the break.

And then in a surprise ending worthy of M. Night (“I see dead people”) Shyamalan  he pulls timecode vinyl out of the grave, builds up a small hardware translator, and gets his original plan working. But we have the feeling that he’s not done yet: he also made a 3D printed optical-mouse holder.

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Turntable Sequencer Keeps the Techno Beat

We’ve got to admit, we don’t have any idea what to call this hack. Artist [Graham Dunning] refers to it somewhat dryly as the “Mechanical Techno method”, but that doesn’t quite do it justice. We’re thinking “Turntable-sequencer-synthesizer-beat-box-dub-stepper thingy. With cowbell.”

Call it what you will, but [Graham] has really gone the distance in extracting as much sound as possible from the humble turntable, which is used as more of a synchronizer than a sound source. Although it does play records too – at least part of them; [Graham] masks the grooves and anchors the tone arm so that only part of a track is played. Other records are masked with conductive film over which wiper contacts are placed, providing triggers for various synthesizers. Particularly clever is the mechanical percussion section; a record is cut radially to form cams that mechanical followers trip over periodically to hit either the cone of a woofer for bass notes, or a cowbell for – well,  cowbell.

It may not appeal to everyone, but you’ve got to admit there’s something mesmerizing about watching this rig in action. The beat is pretty catchy, and as you can see in the live performance video after the break, there’s a lot of room for [Graham] to express himself with this instrument. We wouldn’t mind seeing how Compressorhead would put this rig to work in their performances either.

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Spin DIY Photography Turntable System

A motorised turntable is very handy when taking product pictures, or creating animated GIF’s or walk around views. [Tiffany Tseng] built Spin, a DIY photography turntable system for capturing how DIY Projects come together over time. It is designed to help people share their projects in an engaging way through creating GIF’s and videos which will be easy to post on social networks like Twitter and Facebook.

The device is a lazy susan driven by a stepper motor controlled via an Arduino and an Easy Driver motor driver shield. The Spin system utilizes the Soft Modem library to send signals from an iPhone to the Arduino. This connects the Arduino to the iPhone via the audio socket on the phone. The Spin iOS app is currently in Beta and is invite only. After you’ve built your own Spin turntable, take a picture of it and request the app. Of course, there are many different ways of controlling the motor so if you are handy, you can build your own controller. But [Tiffany]’s iOS app provides a way to stitch the various images to form an animated GIF and then share them easily. Building the turntable should be straightforward if you grab the design files from the github repo, follow the detailed instructions on the build page, and have access to a laser cutter and a 3D printer.

Check out a few similar turntable hacks we’ve featured in the past, such as one that uses the motor from a scanner, an attempt that just didn’t end up working smoothly, and one that uses a belt-drive system. There’s a video of the turntable in action after the break.

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