How about using the pic to output to a R-2R ladder and passing the signal through the reference ladder. The national semiconductor DAC1408 can be used like this. ________________________________________________ David Instone Electronics Technician, Invetech 96 Ricketts Rd, Private Bag 44, Mt Waverley, Australia 3149 Tel +61 3 9265-8888 Dir +61 3 9265-8551 e-mail: dgi@invetech.com.au Fax +61 3 9265 8881 (or 8882) ________________________________________________ -----Original Message----- From: Justin Grimm [SMTP:eclipse@ACCESSIN.COM.AU] Sent: Friday, 6 November 1998 11:55 AM To: PICLIST@MITVMA.MIT.EDU Subject: Auto range Hi all Im trying to build an autoranging circuit for a digital multimeter, I was thinking of a pic controlling a voltage divider circuit, any ideas on how this can be done? Thanks Justin Grimm