you mean the keywiz? Yes, I got email from RandyT telling me it was OK to power it from the keywiz 5V.
I guess what I'm really asking is how do I hook the phototransistor to get the desired effect. I mostly posted here because I thought RandyT was unavailable but he has since anwered my direct email.
I'll post back here if I get it working, but it's probably going to be a few ays until I get to it...