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Old 1st April 2004, 07:35 AM   #1
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Question 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 ?


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Old 1st April 2004, 12:55 PM   #2
Pedja is offline Pedja  Serbia
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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...
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Old 1st April 2004, 01:28 PM   #3
hjelm is offline hjelm  Sweden
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Could you draw a picture i cannot really inderstand how it is connected.
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Old 1st April 2004, 02:15 PM   #4
ergo is offline ergo  Estonia
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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.

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Old 1st April 2004, 02:21 PM   #5
hjelm is offline hjelm  Sweden
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Shouldn't that be rather small when considering the 2,2k resistor and the cap?
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Old 1st April 2004, 04:46 PM   #6
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Quote:
Originally posted by hjelm
Shouldn't that be rather small when considering the 2,2k resistor and the cap?
...and the regulator...
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Old 2nd April 2004, 10:17 PM   #7
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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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