CdPlayer Mod:ferrite on the flat cable connecting the laser unit with the board PCB

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Hello,
just tested that if I add a ferrite core onto the flat flex cable connecting the laser unit with the big printed circuit board, I get slight better sound (more precise soundstage and better bass).

Any scientific reason why, or is just a random performance (could be positive or negative depending on the machine) or just a placebo effect of my ears?
 

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below are images taken from techmasters the cable is longer and there are other differences.

As the signal from the laser is rf you might be removing some noise or stopping some being radiated by the cable? can you view the eye-pattern with a scope?

What you might want to try something like rtlsdr-analyzer-from-dvb-t-tuner/ and maybe see if there is a difference, you might need an antenna just search diy emc antenna or probe.
emc_testing1

regards
james
 

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To my knowledge, cables coming from the laser to the mainboard carry currents, not voltage.
(This was differnt with many models up to the nineties,
where head amps were mounted on the laser do amplify the current to a stable voltage signal. One common example is KSS-240
But nobody seems to do this today any more)
I once tested to shield a current-carrying cable from the laser to the head amp and got almost no signal at all.
Discs were not playable. I assume the shielding caused to produce voltage, like a resistor. Frankly I do not know wether a ferrite has the same effect.
Maybe someone might give an explanation if a ferrite core has an effect on currents at all...
 
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How can shielding a signal cause such a signal degradation? rather strange or you were doing something wrong....
What a ferrite will do in this instance is attenuate high frequency common mode noise, common practice in many areas of electronics...
Without any measurements it is impossible to tell whether it is having an effect or whether it is a placebo effect...
 

prinzinio

Member
2009-02-15 3:46 pm
It is not placebo what you hear.
Ferrite can make a effect on your cables, doesn't matter if these are power, signal or digital ones.
In my diy speaker cables I prefer ferrite core on the positive run wire as close to speaker as possible.
Different placing of ferrite changes (lowes) the effect.

Trust your ears and have open mind, please.


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