by bdring » Thu Mar 18, 2010 11:15 pm
Your power supply will come with one, which is all you technically need. When I played around with various control methods, I was switching things around a lot and found it handy to be able to switch out manual control schemes with computer controlled schemes.
If you think that will be handy, I can send 1 or 2 more.
Bart
"If you didn't build it, you will never own it."