Hi there I'm doing the same thing at the moment. I used the HP HCTL2020 which are very good. The serial D-to-A is from Burr Brown PCM56P. The SPI port can be used to send the info to the D-to-A making interfacing much easier. By the way both are 16-bit devices. I used a 17C43 for the interfacing but any PIC would work. Regards Gavin -------------------------- vulcan@ihug.co.nz ICQ# 18675389 http://www.geocities.com/TheTropics/Cabana/2625 --------------------------