Beresford upgrade with LM4562 gone wrong?

[kabforks]

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, leaving nothing in its place, 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

Replacing the left-most opamp with the stock one + LM4562 increases the volume, but Im not sure which ones are playing then...?

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


Suggestions?

[Fi-Wi]

Yes, contact Stan.

[chrism]

Sorry to ask but are you sure that you have fitted the LM4562 the right way round. Check that the little dot is as per the picture on Stan's site.

The left opamp does the variable output and the right one the headphone output. If you remove the left one you will still have sound through the DAC but it is very quiet.

Regards

Chris

[kabforks]

Sorry to ask but are you sure that you have fitted the LM4562 the right way round. Check that the little dot is as per the picture on Stan's site.

The left opamp does the variable output and the right one the headphone output. If you remove the left one you will still have sound through the DAC but it is very quiet.

Regards

Chris

Not at first, but I fitted them the right way quickly.

Maybe this could have something to do with it? Do the opamps break if fitted the wrong way?

[leo]

Installing the op-amps the wrong way around and powering up for only a second can damage them

[kabforks]

Installing the op-amps the wrong way around and powering up for only a second can damage them

Oh well... that probably solves this problem :-).

Gotta buy some new ones then ^^

[leo]

its an easy mistake to make and usually always fatal to dual op-amps, the usual sign of a damaged chip is overblown distorted sound sometimes no sound at all.

[kabforks]

its an easy mistake to make and usually always fatal to dual op-amps, the usual sign of a damaged chip is overblown distorted sound sometimes no sound at all.

I fried them. One of them are dead slient, while the other produces heavily overblown and distorted sound. Now I just proved to the entire forum that I'm an idiot :lol:

Thanks for the fast reply by the way. $10 isnt that much of an investment, but now I have to wait another two weeks for the new ones to arrive ;]

[leo]

No probs, you live and learn ;) At least it wasn't something like tant caps, those make nice fireworks if installed the wrong way around

Let us know how you get on with the replacement op-amps

[Alex_UK]

I fried them. One of them are dead slient, while the other produces heavily overblown and distorted sound. Now I just proved to the entire forum that I'm an idiot :lol:]

Unlucky. Don't worry about looking like an idiot to the entire forum, most of us do it all the time! I'm sure you won't make the same mistake again! :)

[Covenant]

Can I make a suggestion? Dont buy the 4562's, get 826's-much better.
Also use an anti-static wrist strap when installing them.

[StanleyB]

I find the LM4562 sounds better in the Gatorized TC-7520. But the Gatorized Caiman and Caiman+ sound better with the AD826.
I have even added it to my option list in the Gator ordering page HERE (http://www.homehifi.co.uk/PP/Digital_Audio_Upgrades_1.html).