public apology to Patrick and Castle......

[Pdelcast]

Originally Posted by BrianG

Curious. Can you remember what he said about the resistor? If this is going to be a problem, I will have to put some kind of warning at the top of my "no spark" page...

I don't suggest the "no spark" resistor for the MMM -- for a few reasons. First, the resistors that are suggested are WAY too big. They can cause the beeps (during startup) to cause a boost (with the motor inductance) that creates voltage spikes -- without the battery there to absorb them. -- So if you plug in through the resistor, the caps charge fully, then the ESC beeps the motor -- can cause enough of a "boost" spike to damage some of the more voltage sensitive parts.

Even just the brake turning on (which happens on power-up for safety reasons) can also cause a "boost" spike --

So to be safe, just say no to the resistor.

Really, it's easy on the caps to charge fast -- they don't mind at all. It is hard on the connectors -- but connectors are cheap compared to ESCs...