All items in category Audio & Video

April 16, 2019 by Sunil Malekar

Simple 7-Band Audio Spectrometers

Here we present a direct-reading audio spectrometer using a microcontroller, a graphic equalizer chip, and not much more. Using seven vertical bars on a graphic OLED display, the instrument covers an equal number of sub bands in the audio spectrum. Two versions are available with different functionality in terms of power supply and audio drive input.

Build a Theremin with Tubes Like Leon Did a Century Ago

by Clemens Valens

Build a Theremin with Tubes Like Leon Did a Century Ago

When Leon Theremin built his now famous musical instrument, he only had valves at his disposition. Today we have the choice between analog and digital techniques, and between BJTs, FETs, and valves. We can even combine them all. This special 99th-anniversary version Theremin design only uses valves.

Allo DigiOne SPDIF digital audio HAT for Raspberry Pi

March 14, 2019 by Denis Meyer

Allo DigiOne SPDIF digital audio HAT for Raspberry Pi

Mr. Beekhuyzen talks here of his experience, as an expert, with the production of quality digital audio with the S/PDIF DigiOne audio card, a Raspberry Pi HAT offered by the manufacturer Allo. His critique is very well written, very informative and delivered in an intelligible fashion. Another good reason to listen until the end, and appreciate it: he does not forget to put his appreciation in context.

Review: Allo DigiOne audio HAT for RPi

February 27, 2019 by Thijs Beckers

Review: Allo DigiOne audio HAT for RPi

For the cost of 3 Raspberry Pis you will get from Allo, the DigiOne, a HAT for the Raspberry Pi, which makes available a digital S/P-DIF signal from the audio signal playing on the Pi. Is it worth that much?

Image: Microchip

February 20, 2019 by Microchip Technology Inc.

PolarFire FPGA-based solution enables lowest-power, smallest-form-factor 4K video and imaging applications

This is an article from Microchip on the new PolarFire™ FPGA imaging and video solution. It delivers capabilities superior to alternative technologies to support resolution as high as 4K in small, low-power form factors necessary for a wide variety of imaging and video applications.

Build a portable Bluetooth speaker with light effects

February 12, 2019

by Clemens Valens

Build a portable Bluetooth speaker with light effects

Wireless Bluetooth speakers and sound systems have quickly become very popular devices. Although very practical, the sound quality may not always be as good as you would like it to be. So, then, why don’t you build your own? The electronics needed for it are available as cheap modules from China, the acoustics are up to you. And while you’re at it, why not add lighting effects too? Here is a great tutorial.

MIDI finally gets a major update with the announcement of MIDI 2.0

January 21, 2019 by Clemens Valens

MIDI finally gets a major update with the announcement of MIDI 2.0

About 35 years after its introduction the MIDI communication protocol that lets musical instruments talk to each other has finally gotten a major upgrade with the announcement of MIDI 2.0. Although sporting many new features, V2.0 is 100% backwards compatible with V1.0.

Pollux, a Raspberry-Pi-based universal intercom front end

November 20, 2018

by Clemens Valens

Pollux, a Raspberry-Pi-based universal intercom front end

What do ships, factories and security services have in common? Several different and incompatible communication systems to control and secure one site. Indeed, VHF radios, telephones, intercom systems and more are all used together to communicate with the different services, rooms and departments in a building or on a site. Pollux provides a single front-end for all these communication systems.

Isolated (

October 31, 2018 by Denis Meyer

Isolated (<1 kV) USB/DMX512 converter

DJs and fans of light shows are devotees of USB/DMX512 converters to control their projectors from their laptop PCs. Unfortunately, those found in the commercial world are often not (well) isolated from the mains voltage. Here, on the other hand, an isolated DC/DC converter powers the isolated RS 485 transceiver. Like any DMX device worth of the name, this new converter has an XLR socket.

Raspberry Pi rhymes with Hi-Fi

August 8, 2018 by Denis Meyer

Raspberry Pi rhymes with Hi-Fi

Taking full advantage of the Raspberry Pi’s open architecture, you can customise and program the NanoSound HiFi DAC. With the Volumio software or any other player software and the Infrared Remote Control, NanoSound gives you the best audio performance and experience you can expect from such an audio player.

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