0
\$\begingroup\$

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!

\$\endgroup\$
3
  • \$\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
3
\$\begingroup\$

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

schematic

simulate this circuit – Schematic created using CircuitLab

You might also consider a "Pi" RC circuit:

schematic

simulate this circuit

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

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.