ECG preamplifier for the USBDUX-D

Download which contains the EAGLE files (v5) and the BOM. We do not provide the PCB but it can be ordered from Beta Layout by sending them the .brd file. They can also fit the components. All components can be ordered from Farnell by just copy-pasting the BOM into their "quick paste" order form.


The amplifier operates at a gain of G=1000. If you have an ECG of approx 1mV you'll get 1Vp-p at the A/D converter. A simple high-pass at 0.1Hz filters out electrode drift and DC potentials.

Recording instructions

Watch a video clip about the module Digital Signal Processing which uses this ECG amplifier connected to a USB-DUX.

This amplifier was originally developed for teaching ECG at the Medical Faculty of the Ruhr University Bochum.

Copyright (C) 2005-2012, Bernd Porr,,
Open Software License v. 2.1