Re: I need power
As far as a connector, I cut one off of an old CPU fan. It connects into a power supply plug that is used for the hard/floppy drives. The Red wire is +5, the Yellow wire is +12 and the Black is ground. Using these wires, you should not have a problem reversing the connectors. Getting the power from the computer is the easiest and safest as the power will be filtered and regulated.
My preference is option 2 because I have several filtered external power supplies. Additionally, I use this power source for LED indicator lights. If you go this route, be sure to use a regulated and filtered power supply. Most wall warts will not work. If the power is not regulated, the chips on the Grinch could fry. If the power is not filtered, the fluctuating amperage could effect the porformance of the Grinch.
2 Grinchs, 2 Ren C's and a Ren T for 128 channels (in 2008)
2 Ren64, 2 Ren24 and 1 Grinch, 1 Ren C (in 2009)
3 Ren64, 2 Ren24, 2 Ren16ss and 1 Ren8ss (in 2010)
3 Ren64, 2 Ren24, 2 Ren24ss, 3 Ren16ss and 3 Ren8ss (in 2011)