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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: Which is the BEST step attenuator posted by Greg on August 9, 1999 at 08:00:44:
Relevant Formulas for an attenuator:ATTENUATION:
dB=20*LOG10(shunt resistance /(shunt resistance + series resistance))INPUT IMPEDANCE
= Series resistance + Shunt resistanceOUTPUT IMPEDANCE (simplified estimate)
= Series Resistance / (attenuation in dB / 3)NOTE
----
Series Resistance is resistance between hot input and hot output RCAs
Shunt Resistance is resistance between hot output RCA and ground
Put this into a spreadsheet and you will be able to look at the relationship between the input and output impedances vs attenuation for various designs. Don't worry about the theoretical max output impedance because you never turn your component that loud. Pay attention to the region where you listen to most and design a best match of your connected components for that region
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Follow Ups
- Formula for Attenuation - DG 09:00:53 08/09/99 (5)
- Re: Formula for Attenuation - Greg 20:08:25 08/09/99 (0)
- DG, Help with Formula for Attenuation - Greg 19:58:29 08/09/99 (2)
- Re: DG, Help with Formula for Attenuation - DG 03:48:04 08/10/99 (1)
- Re: DG, Help with Formula for Attenuation - Greg 07:54:38 08/10/99 (0)
- DG, Need help with Formula for Attenuation - Greg 19:42:52 08/09/99 (0)
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