Anonymous at Wed, 11 Sep 2024 08:08:52 UTC No. 16373843

>>16373806
A cap is not a filter. To filter frequencies you need RC or LC (RLC, realistically)
The native input/output resistance of whatever you're connecting the cap to will form a RC filter, but it's impossible to estimate the frequency response without knowing the actual resistance. If you do know it then it's trivial to actually find the equations and frequency response curves on the internet
Do your fucking homework yourself

Anonymous at Wed, 11 Sep 2024 08:34:37 UTC No. 16373887

>>16373843
how come a cap is not a filter, if it practice X2 from 0.01 to 1uF are supposed to let pass only low frequencies?

Anonymous at Wed, 11 Sep 2024 09:09:03 UTC No. 16373923

An x2 only needs to filter frequencies higher than 50/60Hz?

Anonymous at Wed, 11 Sep 2024 20:37:39 UTC No. 16374827

>>16373806
Anon, capacitors are not the low-pass filter component you need. You should be looking for an inductor if you want to kill frequencies.

Anonymous at Thu, 12 Sep 2024 04:12:04 UTC No. 16375458

>>16373806
Tell us your application, along with what kind of frequencies you expect to encounter and how strong of a filtering effect you need. No amount of capacitance will filter 100% of interference.

>>16373843
>>16374827
Don't be disingenuous. You can absolutely use capacitors to reduce noise.

Anonymous at Thu, 12 Sep 2024 05:03:08 UTC No. 16375515

>>16373806
In EE we're a bit fast and loose with the word "filter." A capacitor is one component of an analog circuit. In general, you can think of a capacitor in series with the load, it acts as a "high pass filter" (capacitors at DC steady state are open circuits, capacitors at high frequencies are like shorts).

If you have the capacitor in parallel to the load, it acts as a "low pass filter" as the current will experience lower resistance at high frequencies going down the branch with the capacitor (meaning only the low frequency current will propagate through the load).

In general, you'll want a resistor in the circuit as well. It all depends on your final needs for the filter, but generally you'll want some kind of slightly underdamped second order system. If you've got the math background a basic signals and systems book like Lathi or Oppenheim, and a linear circuits textbook would help you with your filter design.