I found a low cost external USB PC sound card that seems to work OK. The problem now is what software to use. So many choices out there. Any suggestions on a good S/W program to log and plot (in real time) Data from an external USB sound card that has been modified for DC operation? The goal is to end up with a text file of an hour plus long data run, in which the high 41KHz sampled rate data can be reduced (filtered down) to around 100 sample/sec. WarrenS *************** > "WarrenS" writes: >PC data logging capability on a single channel >in the 100 to 1000 samples per second range. Your PC's soundcard ? 16 bits, 40-some ksps, dual channel ? Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 ****************** snip I'm looking for a low cost and simple solution to replace an old 12 bit DataQ ADC for a "nut" project. What I'll like to find is a 2 channel, 16 bit+ bipolar ADC system that can sample in the 1000 samples per second range. Something that does not take a ton of programming time and effort to get working and is readily available and cheap. Having software that allows flexible real time graphing display and simple data logging on a PC is important. WarrenS