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CD player mod

post #1 of 5
5/25/10 at 10:01am
Thread Starter 

I have a first version Cambridge Audio 540C CD player. A good sounding player, nothing high-end though. Today I popped the hood and took out the bog standard NE5532P opamp. I know, a NE5532 ain't bad but more exciting opamps exist. After removing the NE5532 I soldered in a decent DIP socket (to enable easy future opamp rolling). Next I pushed in the AD8066 on a Doc Brown™ adapter I had lying in my parts box. A quick check revealed that my mod is working OK. More clarity and a wider stereo image. Gotto do some more listening though to be able to fully appreciate the upgrade. Not bad for half an hour of work.

Next up: more opamp rolling. I want to try the OPA2134 (of course), AD825 and LME49720. Any other 5 to 10 dollar opamp suggestions? 

 

While I was modding my player I noticed it no longer had a WM8716 DAC chip. It has a WM8740 DAC chip. The repair dept. must have installed the WM8740 when my player was diagnosed with a broken DAC back in oktober 2008.

 

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post #2 of 5
5/25/10 at 3:55pm

Lampitize it!

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post #3 of 5
5/26/10 at 10:05am
Thread Starter 

Quote:

 

 

Originally Posted by Avro_Arrow View Post

Lampitize it!


Haven't got the guts to do that... Besides, wouldn't that require a service manual?

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post #4 of 5
5/26/10 at 11:32am

All you have to do is be able to find the output pins on the DAC.

Just look on the data sheet for the DAC to identify them.

After that, you just lift them from the current circuit board and

run them to whatever you want to design and add in...

If you can take a nice picture like you already have of the DAC

I can tell you a convenient place to steal the signal.

 

However, rolling op amps like you are doing now is fun

and can improve things a bit too. 
 

Quote:
Originally Posted by Beftus View Post

Quote:

 

 

Originally Posted by Avro_Arrow View Post

Lampitize it!


Haven't got the guts to do that... Besides, wouldn't that require a service manual?

Reply
post #5 of 5
5/26/10 at 11:41am

I took a look at the data sheet and the voltage outputs are on pins 12,13 and 16,17.

If they followed the suggested circuit, there should be a couple of caps just after these pins.

You can remove these caps and attach whatever you want at this point. This makes it easier

than trying to lift the pins on the chip and allows you to easily return the circuit to normal.

Quote:
Originally Posted by Beftus View Post

Quote:

 

 

Originally Posted by Avro_Arrow View Post

Lampitize it!


Haven't got the guts to do that... Besides, wouldn't that require a service manual?

Reply
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