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Polyester or Ceramic Capacitors ??

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FMradio

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Hey guy
I wanna know which type of capacitors (Polyester or Ceramic) are best for filtration circuits having high voltage spikes,

What should i use with my low power digital circuit to kill noise ?? (Polyester or Ceramic)?
 

"circuits having high voltage spikes" is far from a clear specification, I can imagine e.g. filter for AC mains supply or fast signal inputs as well. For a usable answer, voltage level and intended bandwidth respectively expected interference frequency should be known.
 
FvM said:
"circuits having high voltage spikes" is far from a clear specification, I can imagine e.g. filter for AC mains supply or fast signal inputs as well. For a usable answer, voltage level and intended bandwidth respectively expected interference frequency should be known.
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sir its a 24v motor driving circuit with back EMF high voltage spikes . . .
 

A motor EMF should be cut by free wheeling diodes, if ever possible (unipolar drive) and varistors or TVS diodes secondly. For the high frequency interferences generated by the firing commutator, a ceramic capacitor of sufficient voltage rating would be the best solution. Film capacitors tend to have a higher series inductance and are less effective in suppressing interferences above 30 MHz (radiated EMI).
 
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    LvW

    LvW

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What capacitor use as "power supply" capacitor for high power 60V 1A switching MOSFET, switching frequency over 10MHz,
ceramic or metalized polyester (capacity 2x 200nF)
 

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