I just got my multi keyer in the mail (thanks for the fast service K5DJ) and as I'm cobbling together the necessary cables, etc., I just wanted to ask about the power needed to run it. I've got a Radio Shack variable 1.5 - 12v / 300mA wall adapter - would the 7.5v setting be okay? I just don't want to fry my new toy. Jamie NS3T