I want to control flow level on 12V water pump with PWM pin, I'm using IRF520N MOSFET for that (and dedicated 12V power supply).

Should I use some capacitor on MOSFET output to "smoothen" voltage? And what kind?

  • no, you should not. – dandavis May 13 '17 at 11:43
  • It's not needed. Some people suggest placing a capacitor across the motor (just like the fly-back diode). To prevent electrical noise some people add a snubber circuit across the mosfet – Gerben May 13 '17 at 12:04

I think you're talking about decoupling caps they are used to smoothen out the spikes and ups and downs in the power. But you're trying to control the flow level using pwm and if you add the Caps that would smoothen the pwm signal!

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  • So whats the answer for my question? – madneon May 13 '17 at 18:55
  • The answer is absolutely No. – Sagnik Pradhan May 14 '17 at 11:24

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