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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: You can only find small ones. posted by Frank25 on January 30, 2007 at 21:03:41:
The 0.47 microfarad cap will likely have a fairly low self-resonance frequency, say about 10 MHz, so it will not couple the higher frequency noise on the line to the resistor very well.What I've found to work best is to use multiple R-C pairs in parallel. Each capacitor is about a factor of 10 smaller, so, for example, use 0.47, 0.047 and 0.0047 microfarad X- or Y-rated caps, each with a 120-ohm or so resistor.
The idea of using a resistor in series with the capacitor is an old one, called Dynamic Loading. It provides a way of dissipating noise energy instead of reflecting it. A straight cap is a short for higher frequencies (up to the self-resonance) and reflects noise. It may reduce the noise in one part of the system but increase it in other parts.
If you are a dedicated scrounger, look for capacitors and resistors that do not contain steel parts. These exist in some surplus parts stores.
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Follow Ups
- Yes, but you want to bypass with smaller caps. - Al Sekela 13:00:34 01/31/07 (2)
- Re: Yes, but you want to bypass with smaller caps. - Aurum 19:34:33 01/31/07 (1)
- Half-watt is fine for up to 1 microfarad. - Al Sekela 14:02:57 02/01/07 (0)
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