It might be better to send the lines to another processor. It would be nice from a current consumption point of view to use latching relays, which means the set/reset pulses would work better under a second processor control. Some of the PIC chips are really cheap and the processor would be doing almost nothing. - Dan, N7VE -----Original Message----- From: minima-bounce@xxxxxxxxxxxxx [mailto:minima-bounce@xxxxxxxxxxxxx] On Behalf Of ext Darrell Collins Sent: Saturday, February 01, 2014 10:31 AM To: minima@xxxxxxxxxxxxx Subject: [minima] Minima LPF Decoder Use 74HC138N 3 line to 8 decoder a transistorto drive the relays .... 138 is active low outputs, 238 is active high outputs so you can have anything you want Darrell WA7DSV