At 12:15 PM 5/8/99 +0300, you wrote: >>>> Hey! I need a low pass filter that uses as input the output of a DAC (808) so that it would convert the signal to a sine wave. A schematic would be perfect! Thanks in advance, Argiris Check the BURR BROWN web page for their app-note on low pass filters. You can even download the design software to go with it. Will do the calcs on Bessel, Butterworth and Elliptic filter types, hi or lo pass, and any number of poles. Charts the results too. Been using it for years. B-B also sells the dedicated filter chips that you can resistor program. We've been using discretes, however. Be sure the op-amps you use have a bandwidth MUCH wider than your cutoff frequency or you will see strange results. ******************************************************************************** **** All legitimate attachments to this email will be clearly identified in the text. Please note our new address and phone numbers. William K. Borsum, P.E. DASCOR P.O.Box 462885 Escondido, CA 92046-2885 V&M&F) 760-796-7785 Direct) 760-796-7788 <