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Old 30th June 2013, 03:32 PM   #1
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Default Upgrading Op Amps in Audio Equipment

Hi All,

I just stumbled upon this and thought it might be helpful and/or interesting to many here. It's an article posted on "Precision Amplifiers" forum at the TI site about Opamp rolling and the hazards of doing so, stuff I've been trying to caution people on for a long time with (apparently) little success. It's a good read, and also includes a short list of suggested substitute Opamps.

Upgrading Op Amps in Audio Equipment - Precision Amplifier Wiki - Precision Amplifiers - TI E2E Community

Mike
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Old 1st July 2013, 04:34 PM   #2
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The words "Not available in DIP package" appear way to often in that article.

Does anybody make an adapter?
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Old 1st July 2013, 04:43 PM   #3
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Old 1st July 2013, 04:50 PM   #4
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There are SMT to DIP adapters available, or you can roll your own. But there can be problems in doing that with some high speed chips, excesive lead or trace length can cause instability and/or oscillation at high frequencies. As the article says, rolling opamps in search of audio nirvana is fraught with hazards that can cause all kinds of problems if one doesn't pay attention to details.

Mike
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Old 1st July 2013, 10:11 PM   #5
Zero D is offline Zero D  United Kingdom
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@ Michael Bean

Thanks for the link

Quote:
Loudthud

The words "Not available in DIP package" appear way to often in that article
Yeah, i noticed that too
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Old 3rd July 2013, 07:30 PM   #6
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The cynic in me says it's a "good article" if you enjoy reading boiler plate CYA and infomercials. When I roll op amps, I'm not pretending to be in search of "audio nirvana," but rather just want a POS receiver to sound tolerable for under $4 -- and with OPA1642 f.ex, it does.
Now that TI has bought BB and National, do they even have any competition left...? I notice they're not recommending any National (LM-numbered) parts.

Otoh, the optimist reads: "FET for FET, and BP for BP, good to go!"
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Old 3rd July 2013, 07:50 PM   #7
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Andersonix,

So you disagree, it's OK to more or less randomly replace an existing opamp with another "superior one" without taking into consideration the circuit it's going into, hoping to get an improvement?

Mike
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Old 3rd July 2013, 08:11 PM   #8
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Unfortunately, this selection list is kind of pointless. It does NOT address anything that would really make a difference.
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Old 3rd July 2013, 09:00 PM   #9
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Quote:
Originally Posted by Michael Bean View Post
Andersonix,

So you disagree, it's OK to more or less randomly replace an existing opamp with another "superior one" without taking into consideration the circuit it's going into, hoping to get an improvement?

Mike
Are you asking the cynic or the idealist in me? Either way, your question has too many incomplete hypothetical scenarios...

My first op amp experiment did indeed result in a smoked tweeter, but since implementing the simplest of precautions (as suggested in the op amp data sheet and helpful pointers here on DIYAudio), I have had smashing success replacing old op amps with new under-$5 ones (LM4562 and OPA1642). So far, I'm winning 5-1 overall, 5-0 this millennium...

Go for it!
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Old 3rd July 2013, 09:00 PM   #10
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I don't really care about the list, what's important is the subject matter of the article.

Mike
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