I've just bought one of these and a D130 doorbell. I'd like to power both from the same supply, so I can mount the H200 near the old door chime. The supply for the chime, which I'm going to use for the D130, is a transformer which can be set to 6v, 8v or 12v. I know 8 or 12 would be OK for the D130. But could I use either for the D200 as well? I know it comes with a 9v supply, but I'd rather not have the additional wire up the wall. 
 

Thanks