Thank you. I have played with the Burr-Brown photo op-amp and they appear to make good and useful devices. Martin McCormick Kelly Kohls writes: >Martin..... Have a look at the TI/Burr-Brown part PGA2310. It's a digitally >controlled volume IC. Might be a better solution than the digital pots. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics