login
The circuit described here is a SPDIF output with a USB interface. It allows connecting Personal Computers, Tablets or Smartphones to Audio equipment including AV receivers, high-end stereo amplifiers or stand-alone audio DACs. It has a infrared remote control receiver that allows controlling media playback and audio volume.
The SPDIF bitstream is generated in software on the same microcontroller that also provides USB connectivity. The SPDIF output is thus a single chip solution that can be implemented with very low hardware effort but is – compared to special USB audio ICs – still flexible and “hackable”. It is even possible to build it on a small breadboard (see below figure).
The PIC32MX270 microcontroller has been chosen for this project. It has the peripherals needed for USB audio applications enough RAM to store encoded SPDIF frames. In addition, there are low pin count variants of these chips that allow for simple PCBs.
The source code can be obtained from https://github.com/kiffie/usb-spdif and used under the terms of the GPL.
RELATED POSTS
14 April, 2016 Getting Started with Atmel ATtiny10
18 January, 2022 X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector Review
30 April, 2019 16 x 2 LCD controlled via power line
19 August, 2024 Makerfabs ESP32-S3 Based NBIOT/LTE-M Air Monitor with Solar Charging is Designed for Remote Environmental Monitoring
26 August, 2021 Lantronix releases Open-Q 5165RB System-on-Module for Edge Robotics Applications
28 June, 2017 20V, 4 MHz, synchronous 2x 6A step-down regulator in 20 sq mm
