Electronics > Beginners
Phono cable and common mode noise filter?
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JohnnyMalaria:

--- Quote from: FriedMule on June 02, 2018, 07:47:01 pm ---
--- Quote from: IDEngineer on June 02, 2018, 06:58:23 pm ---Anyone else here starting to feel like this guy just needs to buy a better amplifier?  :horse:

--- End quote ---

LOL hmm yes that is what I have to do, or build one myself:-)
But it sounds like that it is not possible to filter out external common mode noise if there are only + and - wire on each channel? In a DIY amplifier.

--- End quote ---

Please can you tell us:

1. What is your CD player
2. What is your amplifier
3. What are your cables
4. What is the type of noise (hiss, clicks, pops?)
Richard Crowley:
Various types of noise between audio gear is a very common problem.  And there are several rather simple and very effective methods of resolving these issues.

However @FriedMule has jumped from a sparsely-defined problem straight into solution-space, asking about an impossible implementation of a method (balanced line) rarely seen in consumer audio gear. Rarely seen because there are always better (simpler/cheaper) methods of solving the problem.

@JohnnyMalaria has posted the questions that need answers if we are going to offer @FriedMule any practical advice.  A recording of the noise (and the relative signal level for reference) is a necessary requirement for analyzing the problem.  A review of how everything is powered and physically arranged might also prove useful.
IDEngineer:
I'm still waiting for the results of this incredibly simple and quick test:


--- Quote ---You can test this by shorting the inputs to the amplifier; does it still have what you consider excessive noise? If so, the source of the noise is within the amplifier itself and you can't fix that by manipulating the signals from "standard of the shelf music sources".
--- End quote ---
Audioguru:
Cheap shielded audio cables have a very poor shield that does not shield noise. Expensive Radio Shack cables are exactly the same ones sold cheaply at The Dollar Store.
SL4P:
I haven’t seen a single mention of the word ‘phase’, which is critical to the success of balanced circuits.
The source and propagation of the +/- legs must be phase coherent, or the CMRR will be negligible.

https://en.m.wikipedia.org/wiki/Coherence_(physics)

All this isn’t rocket science, but does require understanding and discipline to implement correctly for maximum benefit.
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