It's not a trick, it's a Philips.

Bernhard · 1st April 2004, 07:35 AM

Hi,

in my CD304mkII I have noticed a 7808 regulator, from it's output a 2,2k resistor goes to an electrolytic cap ( which on the other leg is grounded ) and from there another resistor 2,7k goes to the output of the TDA1541. Same for other channel.

IMHO this brings the TDA output close to 0V, and eases the job of the I/V stage.

Also I still got the feeling it sounds a little better than my CD880.

Is it really better ?

Bernhard

Pedja · 1st April 2004, 12:55 PM

Philips is not the only one that does this. No trick, opamps often sound better without offset. Though you will find some arguing they do not sound better because there are no technical reasons...

hjelm · 1st April 2004, 01:28 PM

Could you draw a picture i cannot really inderstand how it is connected.

ergo · 1st April 2004, 02:15 PM

At least one major downside is evident - all the remaining ripple and noise of this additional supply line is very directly inserted into the audio signal.

Ergo

hjelm · 1st April 2004, 02:21 PM

Shouldn't that be rather small when considering the 2,2k resistor and the cap?

Bernhard · 1st April 2004, 04:46 PM

Quote:

Originally posted by hjelm
Shouldn't that be rather small when considering the 2,2k resistor and the cap?

...and the regulator...

Bernhard · 2nd April 2004, 10:17 PM

Did the mod: From +15V two 3,9k resistors in series to the TDA output with a 10µ cap to ground in the middle,

and first impression is: Better.

Also harmonics spectrum is better 1,5dB.

1st April 2004, 07:35 AM	#1
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	It's not a trick, it's a Philips. Hi, in my CD304mkII I have noticed a 7808 regulator, from it's output a 2,2k resistor goes to an electrolytic cap ( which on the other leg is grounded ) and from there another resistor 2,7k goes to the output of the TDA1541. Same for other channel. IMHO this brings the TDA output close to 0V, and eases the job of the I/V stage. Also I still got the feeling it sounds a little better than my CD880. Is it really better ? Bernhard

1st April 2004, 01:28 PM	#3
hjelm diyAudio Member Join Date: Nov 2003 Location: Västerås	Could you draw a picture i cannot really inderstand how it is connected. __________________ Hjelm

1st April 2004, 02:21 PM	#5
hjelm diyAudio Member Join Date: Nov 2003 Location: Västerås	Shouldn't that be rather small when considering the 2,2k resistor and the cap? __________________ Hjelm

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1st April 2004, 12:55 PM	#2
Pedja diyAudio Member Join Date: Jun 2002 Location: Serbia	Philips is not the only one that does this. No trick, opamps often sound better without offset. Though you will find some arguing they do not sound better because there are no technical reasons...

1st April 2004, 02:15 PM	#4
ergo diyAudio Member Join Date: Mar 2001 Location: Tallinn, Estonia	At least one major downside is evident - all the remaining ripple and noise of this additional supply line is very directly inserted into the audio signal. Ergo

2nd April 2004, 10:17 PM	#7
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	Did the mod: From +15V two 3,9k resistors in series to the TDA output with a 10µ cap to ground in the middle, and first impression is: Better. Also harmonics spectrum is better 1,5dB.

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