The standard MP3 CD player is not provided with an S/PDIF-output that would have enabled the transmission of digital audio signals to other equipment. With the aid of this circuit, designed around an IC from Crystal, an optical and coaxial S/PDIF signal is generated from a kind of I2S signal in the OSCAR MP3-player.Althoiugh the OSCAR MP3 player is fitted with analogue audio outputs that may be connected to other hi-fi equipment or the line input of a sound card, it would be easier and less lossy to transfer the signal in digital form to another piece of equipment with digital input, especially when recording tracks using, for instance, a DAT- or MD-recorder.As standard, OSCAR does not possess an output that provides a digital audio signal in usable form. However, on the main circuit board is a connection that provides digital audio data in a ‘raw’ format. This signal must first be correctly encoded with additional information bits and then transmitted with the correct bi-phase modulation and amplitude.