Hello Jedi As an amateur I have the interesrt in building an ECG machine, and have now completed the basic amplifier circuit to acquire the ECG signal from my own body. Please see my previous posting in this forum: http://www.electronics-lab.com/forum/index.php?topic=1746.0 What I like to do may be some what similar to what you are planing to do, i.e. to display the signal on the PC, for ease of data manupulation and storage, etc. I am a hardware man and I find it difficult to get the part of job in computer programming. I have used a program downloaded from the Internet to display the ECG signal fed to the PC via the sound card. However since a sound card is basically an AC amplifier, the DC content of the ECG signal is lost and so there is some sort of distortion introduced. I am still figuring out how this problem can be solved by software means. May be we can share our experience with each other. I am not familiar with medical equipment in practical use -- would it be easy nowadays to have readily available digital output from the ECG machines ? So why do you need the ADC input board for this purpose? Best regards, Olihou