For best noise reduction it is recommended to solder small capacitors between each motor lead and the metal motor housing, as well as directly across the leads. I have the 30:1 micro metal gearmotor, and I’m concerned about the plastic endpiece that holds or forms the rear bearing as well as the terminal spacer. Does anyone have experience with the resistance of this plastic part to soldering temperatures?
I’ve successfully soldered caps to motors with metal endpieces and have noticed that it takes a lot of heat for the solder to stick well. I don’t like the idea of disassembling the motor prior to soldering because of the possibility of damaging the brushes.
On the other hand, is motor noise a serious issue with the 30:1 motors? Possibly one cap would suffice.