Zobel at the srpp input - diyAudio
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Old 8th August 2014, 01:48 PM   #1
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Default Zobel at the srpp input

Hi,

I see that combak harmonix and a few others make zobel filter logged in an interconnect to put at the input of the preamplifier or integrated amplifier.
I'd like to try it, but I'd like to avoid an impedance mismatch? At your sense what kind of values could I try? I heard such zobel where done to filter HF and that some of these filters where done to filter 20ghz.

Thanks a lot: David
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Old 10th August 2014, 08:28 AM   #2
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No idea?
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Old 10th August 2014, 11:02 AM   #3
AndrewT is offline AndrewT  Scotland
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What are you talking about?
What is 20ghz?

Zobels, when used, are usually located at the output, or exceptionally for a speaker, at the input.
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Old 10th August 2014, 08:20 PM   #4
DF96 is offline DF96  England
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A Zobel network is used to maintain stability by ensuring that a misterminated cable does not impose too high a capacitive load on a buffer-type circuit. Unlikely to be needed for your application, unless part of your equipment is unusually poorly designed..
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Old 10th August 2014, 09:33 PM   #5
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About 20ghz: 6moons audio reviews: Crystal Cable Bridge

The dnm way: DNM Products - ZRTN and High Frequency Termination Networks

comback harmonix: ENACOM AUDIO NOISE ELIMINATORS

In these 3 products the main idea seems to remove HF from the signal and I think they use zobel with a tiny cap (maybe 0.01uf) but I've no idea of the resistor value. The main problem is to not cause problem for impedance matchning between cd player (mine is 600 ohms output) and the srpp of my integrated amplifier.
An idea of the resistor value?

Thanks: david

Last edited by zycomatique; 10th August 2014 at 09:37 PM.
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Old 11th August 2014, 08:55 AM   #6
AndrewT is offline AndrewT  Scotland
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I quickly scanned through your links.
I did not see "Zobel" mentioned.

I did see RF and interference mentioned.

I think these are simply RF filters to help attenuate all the mobile phone and other wireless domestic rubbish you are adding to your audio circuits.
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Old 11th August 2014, 11:28 AM   #7
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Hi Andrew,

Do you know some diy examples of such filters?
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Old 11th August 2014, 11:40 AM   #8
SY is offline SY  United States
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Quote:
Originally Posted by zycomatique View Post
Hi Andrew,

Do you know some diy examples of such filters?
A 10 cent cap (small ceramic disc) and possibly a 5 cent ferrite bead or a small inductor. This is only needed if you're actually experiencing RF interference (e.g., hearing cell phone or radio signals through your stereo).

Reading 6 Moons and ad copy from cable companies is guaranteed to lower your IQ.
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Old 11th August 2014, 01:52 PM   #9
DF96 is offline DF96  England
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Sigh! If only I wasn't so honest and so well educated I could make a fortune by taking money off ignorant and gullible audio fans. First I would need to spend some money on a good creative writing course, but you always have to speculate in order to accumulate. Even if my products didn't sell I could always make a few bob by writing fiction for an audio magazine.
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