Philips CD 160 DC offset

Chivvyp · 6th October 2006, 10:09 AM

Hi,

I have an old Philips CD 160 which I'm playing with. I was looking to remove the DC blocking caps but I noticed a DC of c. 4 v on each of them although they take care of it ok.

I looked further and I can see the DC voltage on pins 1,5,6 and 7 of both opamps.

For both channels the DC is exactly 4.08 V.

Given that this is exactly the same on both channels I just want to check it it's really a problem or if it's intended to be like that (I don't have any schematic).

Grateful for any advice.

Thanks

Pete

Tube_Dude · 6th October 2006, 10:15 AM

Is exactly like that, and is the reason why the output capacitor was there...

poynton · 6th October 2006, 01:56 PM

Quote:

Originally posted by Chivvyp
Hi,

I have an old Philips CD 160 which I'm playing with. I was looking to remove the DC blocking caps but I noticed a DC of c. 4 v on each of them although they take care of it ok.

I looked further and I can see the DC voltage on pins 1,5,6 and 7 of both opamps.

For both channels the DC is exactly 4.08 V.

Given that this is exactly the same on both channels I just want to check it it's really a problem or if it's intended to be like that (I don't have any schematic).

Grateful for any advice.

Thanks

Pete

Hi.

I have attached the output stages of the CD160.
As you can see, it is direct coupled from the TDA1541 DAC to the output cap, hence the Dc on the output.

Andy

Chivvyp · 6th October 2006, 04:15 PM

Thanks all for the info. Looks like I need to keep the caps!

Do you have any more data to spare on this player, Andy?

Regards

Pete

6th October 2006, 10:09 AM	#1
Chivvyp diyAudio Member Join Date: Apr 2006 Location: London	Philips CD 160 DC offset Hi, I have an old Philips CD 160 which I'm playing with. I was looking to remove the DC blocking caps but I noticed a DC of c. 4 v on each of them although they take care of it ok. I looked further and I can see the DC voltage on pins 1,5,6 and 7 of both opamps. For both channels the DC is exactly 4.08 V. Given that this is exactly the same on both channels I just want to check it it's really a problem or if it's intended to be like that (I don't have any schematic). Grateful for any advice. Thanks Pete

6th October 2006, 10:15 AM	#2
Tube_Dude diyAudio Member Join Date: Mar 2002 Location: Aveiro-Portugal	Is exactly like that, and is the reason why the output capacitor was there... __________________ Jorge

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6th October 2006, 04:15 PM	#4
Chivvyp diyAudio Member Join Date: Apr 2006 Location: London	Thanks all for the info. Looks like I need to keep the caps! Do you have any more data to spare on this player, Andy? Regards Pete

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