You will need a couple of resistors (I've heard 2.2k quoted, but obviously it'll depend on the precise servo), *or* what you can do is keep the pot but just glue it in place to provide enough resistance to keep the motor still. I'd use hot glue so you're not locked into one position forever...thetopcat84 wrote:1) for keeping things cheap and cheerful for the time being, I assume I can recover the ESCs from the tower-pro SG90s and re-use them, but bypass the old potentiometer by simply wiring up the gap on board? Or would a couple of resistors be needed to keep it functioning?
You are correct in thinking that! (You can simulate single stick steering by having one servo/motor on aileron and one on elevator, and everything makes sense if you turn the transmitter 45 degrees, but I wouldn't reccommend it...) Depending on your transmitter you may be able to use a mixing function on that, and a lot of dual channel controllers now have mixing built in, so you don't necessarily have to do it with an in-robot mixer (which tend to be a little cheap and nasty in my experience).2) Channel mixers, would I be right in thinking that a channel mixer would help me off tank steering and onto single stick steering? Leaving the other stick free for a weapon (eventually, walk before you can run, TC)
It's not as necessary as it used to be - back in the 40mhz days, you sometimes had to do literally anything and everything to cut down on RF noise, but in the Spektrum era it's not as much of a concern. There's no reason not to, but then there's also no reason, erm, yes to, any more!3) Is it absolutely necessary to stick capacitors onto geared brushed motors? From what I've read, apparently things can get sparky?