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noise filtering help
- Thread starter ALFRED56
- Start date
I have had good luck with 3000uf 25 volt caps on some vehicles. also I have used old caps that are used on the old point type distributers on cars also. put the center lead on the hot wire and ground the ground or negative lead. what I liked about the condensor used in distrbuters it has a metal case with a tab to screw it to ground.
you will just have to try different ones to see what works the best in your rig.
you will just have to try different ones to see what works the best in your rig.
For typical brush noise in something like a wiper motor, the first thing would be to clean up the commutator and install new brushes (which might exceed the cost of a new motor).
If there's still noise, the best I've ever used is disc ceramic; anything from 0.1 - 0.5 microfarads, with a working voltage of at least 50VDC. Install as close to the motor housing as possible and keep the ground lead as short as possible. These aren't polarity-sensitive either lead to the motor hot lead and the other lead to ground. Note how much difference one capacitor makes and judge for yourself if you need (or want) to add another in parallel to see how much it changes things. Might change; might not.
Same for the fuel pump, but here you don't want to get into the tank. Just as close to the tank as possible. Hot lead and ground.
If there's still noise, the best I've ever used is disc ceramic; anything from 0.1 - 0.5 microfarads, with a working voltage of at least 50VDC. Install as close to the motor housing as possible and keep the ground lead as short as possible. These aren't polarity-sensitive either lead to the motor hot lead and the other lead to ground. Note how much difference one capacitor makes and judge for yourself if you need (or want) to add another in parallel to see how much it changes things. Might change; might not.
Same for the fuel pump, but here you don't want to get into the tank. Just as close to the tank as possible. Hot lead and ground.
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