I have some brushed motors near to a 433 MHz RF receiver. They're controlled by a 490 Hz PWM signal. The electrical noise they produce is not a problem for the circuit, but it is for the receiver.
How can I reduce the noise, at least on the frequencies interfering with the transmitter?
I read that putting a ceramic capacitor across the motor's terminals and one from each terminal to the motor's case would help; if it's true, what size should they be? I unfortunately don't have technical information about the motors. I'm quite sure they're the same as those, but there isn't much data on that site...
Answer
I read that putting a ceramic capacitor across the motor's terminals and one from each terminal to the motor's case would help; if it's true, what size should they be?
You read the truth. Keep the leads to the caps short. 10nF is a reasonable sort of size, but you can go bigger or smaller if you have other sizes to hand.
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