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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: Filters Done - Pictures posted by Maxamillion on May 13, 2010 at 04:15:22:
So, now that you know the characteristic impedance of your cables (hopefully), all you need to do is to match the resistor value to that value - in my case it was 71ohms. Then calculate the amount of capacitance you need together with that resistance to achieve the -3dB corner frequency you would like, using the equation:
f=1/(6.28*R*C) , where resistance is in ohms and capacitance is in Farads
In my case, I wanted to get an f = about 500kHz, so I used 4.2nF of capacitance.
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Follow Ups
- Rest of the answer, Jim - Maxamillion 05/13/1004:28:12 05/13/10 (0)
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