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All items in category Audio & Video
Free Back Article: Card Sound
January 24, 2020 by Elektor Team

Free Back Article: Card Sound

With a smartphone or an MP3 player it’s easy to play audio files, but generally not at room strength or if you can, only in wretched quality. The Card Sound project makes it possible to fill the room with music and have excellent sound reproduction! This lightweight and compact player also stands out for its modest quiescent current consumption and desirable extra features such as I²C and RS-485 control.
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Small Circuits Revival – Episode 4
November 21, 2019 by Eric Bogers

Small Circuits Revival – Episode 4

This circuit adjusts the gain of (small) input signals such that the amplitude of the output signal is constant over a wide range. The control voltage is obtained from a cascade circuit.
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Free Back Article: Audio DAC for Raspberry Pi
October 24, 2019 by Elektor Team

Free Back Article: Audio DAC for Raspberry Pi

Small single-board computers like the Raspberry Pi are ideal for use as small stand-alone network audio players. With Volumio and other specialized Linux distributions, putting together an audio player is remarkably easy. And as ElektorLabs worker Ton Giesberts shows in this article, you can also use this approach to build a high-end audio player.
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Cool Summer Free Download of the Week: Supra 2.0 super low-noise MM/MD phono preamp
August 21, 2019 by Elektor Team

Cool Summer Free Download of the Week: Supra 2.0 super low-noise MM/MD phono preamp

Vinyl is back with a vengeance among hi-fi enthusiasts. The sound of vinyl records is something very special and cannot be compared to the sound of digital audio sources. In this article we present a high-end phono preamplifier featuring four special opamps wired in parallel in each channel to achieve extremely low noise. We used this approach earlier in a design published back in 1982, with discrete transistors at that time.
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Build Your Own LP Record Cutting Lathe
August 6, 2019
Proposal
by Clemens Valens

Build Your Own LP Record Cutting Lathe

Vinyl records have never been more "back" as today. As this project goes to show, a nearly 150-year-old technology prototyped by Thomas Edison combined with modern and accessible CNC machinery and microcontrollers is now turning out homegrown LP cutting lathes. This post on the Elektor Labs website may be lacking detail, but boy, is it cool!
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Review: Allo DigiOne Audio HAT for RPi
July 11, 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?
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Isolated (
July 4, 2019 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.
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Review: Camera Projects Book — 39 Experiments with Raspberry Pi and Arduino
June 18, 2019 by Koen Vervloesem

Review: Camera Projects Book — 39 Experiments with Raspberry Pi and Arduino

Do you intend to work on a Raspberry Pi project with a camera? Then this book will get you going for sure. In this book about camera projects, Dogan Ibrahim shows you how you can do this step-by-step . From a simple photo with a selfie stick, or the construction of a wildlife camera, right up to the complex process of licence plate recognition.
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MIDI I/O Breakout Board – Supports DIN and TRS Connectors
June 4, 2019 by Clemens Valens

MIDI I/O Breakout Board – Supports DIN and TRS Connectors

At the start of 2019, some 35 years after its introduction, version 2.0 of the Musical Instrument Digital Interface, better known as MIDI, was announced. MIDI 2.0 introduces many new features, two of them being two new connectors. A new universal MIDI interface breakout board is due and here it is.
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Simple 7-Band Audio Spectrometers
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.
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