I have a RC filter on which I need to increase the capacitance. I have one 47uF ceramic capacitor and 2 47uF aluminum electrolytic ones at home. Can I use these in parallel in the RC circuit? Thank you for your help!

  • \$\begingroup\$ For what kind of signal? And what arrangement of filter? \$\endgroup\$
    – Majenko
    Oct 24 '16 at 14:12
  • \$\begingroup\$ PWM going from 0 to 5V. \$\endgroup\$
    – Eliott W
    Oct 24 '16 at 14:13
  • \$\begingroup\$ How much current are these capacitors being asked to handle? Is this circuit part of the power stage of some kind of amplifier or power supply? \$\endgroup\$
    – pgvoorhees
    Oct 24 '16 at 14:41

For a low-pass filter for PWM where the voltage is always the same polarity yes, you can use multiple electrolytics:


simulate this circuit – Schematic created using CircuitLab

You might also consider a "Pi" RC circuit:


simulate this circuit

For lower losses it is better to replace the resistor with a suitable inductor to make an LC circuit.


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