At 10:43 PM 1/5/2006 -0500, you wrote: >I am thinking about: >using pic's 12 i/o and r2r net, as DAC, with op as >buffer. > >is this way acceptible? any example? Yes, you can do this. With 0.1% resistors you can approach 11-12-bit accuracy *typically*, but you'll need a decent buffer on the output. Don't expect it to be monotonic. >Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com ->> Inexpensive test equipment & parts http://search.ebay.com/_W0QQsassZspeff -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist