Moding CD player power supplies

Salsero · 13th December 2003, 12:46 AM

Has anyone considered using an outboard medical linear regulated power supply for their CD players? The medical supplies are designed to be low noise and can be obtained for approximately $50 for an 18V / 1.5A supply. One can then feed this to individual regulators for the various components Ii.e. transport motor, clock, analogue stage, etc...........).
A second question: does anyone have a mod for the output stage of a DAC using class A Fets? I think that with a few mods like these and a better clock one can get some pretty good sound out of an economical CD player.
I look forward to your comments.

pburke · 13th December 2003, 03:00 PM

I'm also interested in using external power for my CD player. IS there any reason why batteries should be avoided? Does the transport suck up too much juice to make it a reasonable solution for all the voltages? If yes, what part of the PS should be kept wired to the wall outlet?

In terms of Power supplies - I have this nice Hewlett Packard 1-20V DC 10 amp lab bench power supply I currently use for my slot car tack (

) which I could easily set to any voltage needed in the CDP to do some testing regarding the impact of outboard power.

As long as the original PS is in the player, though - would I hear the full difference by substituting the external DC source for some of the leads in the player? I suppose the ultimate mod is to completely remove teh original PS form the transport.

Peter

Peter Daniel · 13th December 2003, 03:38 PM

Check the last posts in this thread:
Less simple I/V for TDA1543

I'm using batteries for DAC and output stage with very good results. The transport and logic is still powered by the original supply.

dantwomey · 13th December 2003, 04:26 PM

I'm currently looking at super-regulators like or similar to the ones offered by ALW (ALW Audio). And, although I cannot speak for first-hand experience yet the reports I'm getting are that these super regulators are an excellent step towards creating a first-class power supply.

Regards,
Dan

KevinLee · 13th December 2003, 04:31 PM

I have used a Corcom 6EHQ1 medical grade filter with good results in 2 or 3 CD players.

KevinLee

13th December 2003, 12:46 AM	#1
Salsero diyAudio Member Join Date: May 2003 Location: Texas USA	Moding CD player power supplies Has anyone considered using an outboard medical linear regulated power supply for their CD players? The medical supplies are designed to be low noise and can be obtained for approximately $50 for an 18V / 1.5A supply. One can then feed this to individual regulators for the various components Ii.e. transport motor, clock, analogue stage, etc...........). A second question: does anyone have a mod for the output stage of a DAC using class A Fets? I think that with a few mods like these and a better clock one can get some pretty good sound out of an economical CD player. I look forward to your comments.

13th December 2003, 03:00 PM	#2
pburke diyAudio Member Join Date: Nov 2003 Location: Madison Wisconsin	I'm also interested in using external power for my CD player. IS there any reason why batteries should be avoided? Does the transport suck up too much juice to make it a reasonable solution for all the voltages? If yes, what part of the PS should be kept wired to the wall outlet? In terms of Power supplies - I have this nice Hewlett Packard 1-20V DC 10 amp lab bench power supply I currently use for my slot car tack () which I could easily set to any voltage needed in the CDP to do some testing regarding the impact of outboard power. As long as the original PS is in the player, though - would I hear the full difference by substituting the external DC source for some of the leads in the player? I suppose the ultimate mod is to completely remove teh original PS form the transport. Peter

13th December 2003, 03:38 PM	#3
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Check the last posts in this thread: Less simple I/V for TDA1543 I'm using batteries for DAC and output stage with very good results. The transport and logic is still powered by the original supply. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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13th December 2003, 04:26 PM	#4
dantwomey diyAudio Member Join Date: Feb 2002 Location: Canada	I'm currently looking at super-regulators like or similar to the ones offered by ALW (ALW Audio). And, although I cannot speak for first-hand experience yet the reports I'm getting are that these super regulators are an excellent step towards creating a first-class power supply. Regards, Dan

13th December 2003, 04:31 PM	#5
KevinLee diyAudio Member Join Date: Oct 2002 Location: Winnipeg MB Canada	I have used a Corcom 6EHQ1 medical grade filter with good results in 2 or 3 CD players. KevinLee

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