EDF player

This a prototype of an "EDF player", a device I designed and built to convert EEG-files back to electrical signals. It can be used to check and calibrate equipment used for electroencephalography. It reads EDF-files from a Compact-Flash memory-card which is located at the back. The display is used to select the desired file on the memorycard and it shows the elapsed time among other things like samplefrequency, number of channels etc.

Front view of the EDF player

The circuit contains (among other things) a slot for the Compact-Flash card, a PIC-microcontroller, a 16-channel DAC and an LCD-display. A second (smaller) PIC-microcontroller is used to drive the LCD-display (not shown in the schematic). The two PIC's communicate to eachother via a serial connection.

Inside view of the EDF player

Features

- supported fileformat: EDF
- filesystem: FAT16
- maximum channels: 16
- resolution: 16 bit
- outputlevel: +/-6 Volt and +/-3 mVolt full scale

Schematic of the EDF player,
click for higher resolution