[waynehoskins]

Originally Posted by wyatt20019

so what do i need on top of this? AC/DC POWER SUPPLY ADAPTOR 30 VOLT 30V 30VDC 500MA - eBay (item 270261524815 end time Aug-31-08 18:24:05 PDT) and how do i do it?

That's not going to be regulated, but it at least may have some amount of filter capacitor in it. That might work directly as-is. Failing that, it's easy to build up a 317 and the other components of the regulator circuit onto a small board or some such.

Another thing you will want to do is terminate the intercom bus at that same connector with whatever resistor value they suggest (200 ohms or something like that).