This project describes my efforts of enabling the auxiliary input (aux-in) of a SONY car radio (type: xrc750), based on the GNUnilink schematics. Unfortunately, the project is not longer being maintained, and as I've heard some people experiencing difficulties (including myself) with getting the aux-in to work, I decided to write a small page about this dongle. You can order the assembled dongle, the parts, or just download the layout and the code to try and make the dongle yourself! More...

The current status of the project is temporarily on-hold. The first prototype has been succeeded by the second prototype in May, 2006, and has the following specifications:

The GNUnilink dongle:
* based on the schematic of the gnunilink website
* CPU: PIC16f628 running at 22.1184 Mhz
* serial RS232 communication, rates up to 115200 baud
* built-in PIC programmer, only high voltage programming (HVP)
* eight 3 mm LEDs for general display of PIC signals
* four I/O pins available trough sub-d 25p connector
* size: 110 mm x 55 mm, single-sided PCB
* power supply: 12V/100mA for normal operation (13V-16V for programming)

This article describes how the prototypes evolved.

1. Introduction
2. A simple experiment
3. The first prototype
4. The second prototype

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