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Best way to mod cheap cd-players-enhancing the noise
Best way to mod cheap cd-players-enhancing the noise
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Old 14th January 2019, 04:35 PM   #41
gpapag is offline gpapag  Greece
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Best way to mod cheap cd-players-enhancing the noise
Quote:
Originally Posted by dreamth View Post
I'm also 41 so i do enjoy a bit more bass and highs...
All the values should be different for other tape heads and should be tweaked accordingly .
You are on an empirical path to trim your equipment output match your taste (preference).
Thatís perfectly all right for you and anyone else around.

At the same time, this makes you the only one to be able to answer your questions

Quote:
I simply can't make my mind which RC network to choose best with the R1
George
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Old 14th January 2019, 09:15 PM   #42
dreamth is offline dreamth  United Kingdom
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Quote:
Originally Posted by gpapag View Post
You are on an empirical path to trim your equipment output match your taste (preference).
Thatís perfectly all right for you and anyone else around.

At the same time, this makes you the only one to be able to answer your questions



George
Indeed... usually i can get it right only through countless series of comparative listening but an oscilloscope ca make the difference.I made the feedback resistor 60k(68k//1meg//1meg) though today...
As somebody suggested me with justified irony that the best cd-player mod would be a better cd player...I just bought a Sony DVP725 dvd-player and i'm amazed of the components quality...Unfortunately it's headphones amp is a njm4580 in noniverting topology and the dac are vout types that sounds completely uninvolving.No slew rate, no power, no nothing...At least i have good op-amps and a state of the art power supply now.
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Old 15th January 2019, 11:22 PM   #43
dreamth is offline dreamth  United Kingdom
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Denon Test Disc-1986
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Last edited by dreamth; 15th January 2019 at 11:40 PM.
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Old 19th January 2019, 12:23 AM   #44
dreamth is offline dreamth  United Kingdom
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Christmas time again!
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Old 19th January 2019, 04:48 AM   #45
dreamth is offline dreamth  United Kingdom
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Long long night...building my new "effect box" and listening to the older one.
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Old 20th January 2019, 02:54 AM   #46
dreamth is offline dreamth  United Kingdom
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I just realized that i bought the last Kate Bush album for a quarter of a pound...
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Old 24th January 2019, 03:46 AM   #47
dreamth is offline dreamth  United Kingdom
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This would be the last mod i did around the i/v converter for the tda1543.I wanted to make the i/v output even lower so i made the feedback resistor 500 ohms, paralleled both sections of each op-amp .
Although, from the beginning i should have doubled the integrating capacitor's value when i halved the feedback resistor i found that the sound is cleaner with half of the optimal value.


For years i had to listen to all sorts of myths around lm833 , like this should be an inferior part and such.Well...IT'S NOT! You just need to give it the right food.I couldn't hope for a better sound than this old player could give me to be honest.



I'm thinking of cascoding the i/v input as to make a lower capacitive input , but i don't really feel a need for smth like this.
Right now i'm building a new box with my new "effect" and hopefully i'd be able to try it on better cd-players as they are.I'm using spare parts from 3 cd players , one dvd player and an audio class d amplifier of which i had the box.
As i can only hear up to 14 or 15 khz...depending on the test...i don't really care of higher end equipment.I'm in my 40's now and most of the audiophile guys i know are in their 50's or 60's...and can't even hear the 12khz test , so I believe that my garbage player is high end for more people than you'd believe.
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Last edited by dreamth; 24th January 2019 at 04:03 AM.
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Old 29th January 2019, 03:22 PM   #48
dreamth is offline dreamth  United Kingdom
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Because I'm attempting to make a stand alone box just for the digital garbage masking effect , and because i felt I wanna understand more on what you can do with the cheap njm4556, i started to sim some drivers for the rec head used by Yamaha in their kx-930 and kx1200 cassette recorders for the rec head with just their universal op-amp model, but i also wanted to sim it with my headphones impedance just for fun.I don't really know how to sim my headphones load though...I just measured their inductance and resistance with a simple meter and i put those values in series...I will use their simple inverted topology for the headphones section.
You can do your own investigations changing the value of all components and op-amp models, even your tapeheads or headphones models. As i have no idea how to calculate gain when you have both positive and negative feedback in an op-amp i used the mighty LtSpice to help me.
You have a glimpse of the final device in the last photo and the final sim of the yamaha kx 930gain , less than one obviously but that is only because of the 270 ohms output resistor .If i use 150 ohms resistor the gain is suddenly 2X instead of 0.3X .
Each device was carefully prepared .I still have no means for measuring my toy, but i fully trust my ears and anyway...this device is made for me to accept the sound of an old cd player which otherwise isn't really a great one....
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Last edited by dreamth; 29th January 2019 at 03:46 PM.
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Old 29th January 2019, 04:22 PM   #49
dreamth is offline dreamth  United Kingdom
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I wonder what's the meaning of all This...
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Old 29th January 2019, 04:22 PM   #50
dreamth is offline dreamth  United Kingdom
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and this...
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