Greg,
I was wondering the same thing. I'd see if someone else weighs in but that same type of VReg is used on the MR16 DC controller with a heat sink and the normal power supply for the MR16 controller is 12 volts. I have an area where I have a 12v ATX PC power supply running a display element and would like to tap the 12v from it for the TX/RX instead of having a seperate wall wart for the TX/RX.
Thanks for posting the question.
Alan T
Greg,
Thanks for the update and the feedback you got from RJ.
I pulled up the Mouser Direct BOM in the Wiki and from Mouser found the data sheet for the L7805ABV voltage regulator.
http://www.st.com/stonline/products/literature/ds/2143.pdf
In the electrical characteristics section (pg 10 for the L7805Axx) it shows the typical Input Voltage range can be 7.5 to 18 volts.
I've got a spare TX/RX PCB so I may build one up and add a heat sink.
My guess is that with a suitable heatsink the TX/RX should work fine on 12 volts.
I'll report back when I get a chance.
Alan T