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Beresford 7520 upgrade LM4562 gone wrong`?

post #1 of 2
2/25/11 at 7:25am
Thread Starter 
Hi.

I just got the LM4562 opamps. From what I've read, you can just replace the old ones with these with no hassle.

However, the DAC now outputs an extremely noisy signal; impossible to listen to. It's like a listening to a... no it's just TERRIBLE. Replacing the new opamps with the old ones fixed the problem

What could be wrong? Are the opamps defect? Anyone experienced this?


I have found a workaround though.

* Remove the left-most opamp, as seen in this picture, http://www.hifiwatcher.com/wp-content/uploads/2010/07/Tirna1.jpg
* Set the volume knob to 0.
* Listen to sound on fixed output only

Fortunately I have an external headphone amplifier so I'm good, but this kinda sucks all-in-all.


Suggestions? smily_headphones1.gif
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post #2 of 2
2/25/11 at 8:09pm

Just guessing, but maybe you need a single-channel op-amp (LME49710) instead of a dual-channel op-amp (LME49720, LM4562).

 

Or maybe you installed it backwards, or you have bad parts.

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