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Old 27th March 2008, 01:02 PM   #1
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Thumbs down Donīt waste time with changing op-amps

Just replaced NE5532P with LME49720HA in my TDA1541 OS DAC, i hear almost no change, it is absolutely no match to tupe preamp or even solid state preamp. It confirmed my finding that op-amps are crappy amplifiers.
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Old 27th March 2008, 01:26 PM   #2
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Sometimes the difference is little but it's possible if you have had a DAC with higher resolution you would have noticed some difference but you are right: sometimes the difference is small but much bigger in the tweakers ears....
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Old 27th March 2008, 01:31 PM   #3
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I am frustrated, i thought it will improve sound of the dac, miracle didnīt take place. Probably TDA 1541 isnīt such a great DAC how i thought.
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Old 27th March 2008, 01:41 PM   #4
KP11520 is offline KP11520  United States
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Sometimes you need to also look at the whole circuit or analog stage. Op amps aren't as plug and play as we are led to believe just because the voltage and pin configuration is the same.

Compare data sheets between the old and new and look for ideal decoupling cap values, resistor values and look at the ideal circuits they illustrate on the data sheet. You may see things that don't get great results in your set up. Also address the circuit as a whole. Maybe the output caps need a different value as well as the other components past the output of the op amp.

Unless you have already done all that and it is ideal for the op amp, then it is what it is. Otherwise give it some thought and maybe try some other changes too!

Good luck!

Regards//Keitth
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Old 27th March 2008, 01:49 PM   #5
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You are right, but LME49720H are crappy amplifiers, they are even brighter then NE5532, it is absolute arrogance wanted 10 USD for the piece, these junk amps arenīt worth 10 cent. Engineers at National Semiconductor should visit ear specialist.
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Old 27th March 2008, 01:57 PM   #6
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If two different op-amps sound too bright in your circuit, it's likely that the problem isn't in the op-amps themselves, but in the circuit you have designed around them!
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Old 27th March 2008, 02:06 PM   #7
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OPA2604 maybe
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Old 27th March 2008, 02:08 PM   #8
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What Duroboros said is something to research. A nice sounding piece of equipment isn't just a DAC or op amp. It is a balanced recipe, so check to see that the recipe is there to begin with!

Maybe try a pair of OPA627s with a browndog adapter. I replaced my 5534s with them and they are warmer and fuller with detail and presence.. However, they require two and the adapter per channel. The 627s go for anywhere around $12.00 and up. Be careful of counterfeits as TI hasn't made a batch in quite some time. Also be aware that the components around them will need to be tweaked as the ideal components for the 5532s aren't exactly the same.

Good luck
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Old 27th March 2008, 02:10 PM   #9
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Quote:
Originally posted by John007
You are right, but LME49720H are crappy amplifiers, they are even brighter then NE5532, it is absolute arrogance wanted 10 USD for the piece, these junk amps arenīt worth 10 cent. Engineers at National Semiconductor should visit ear specialist.
.. and you have tested this with a high-end pcb, I mean highest possible quality in material and in copper pattern? Did you come to this conclusion with a single sided pcb?

Many tweakers draw their conclusions from a non-optimal environment for the test oapmp.
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Old 27th March 2008, 02:11 PM   #10
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I have seccond DAC, first was Zhaolu, in both DACīs NE5530 sounded horrible, it is not circuit it is crappy op-amps, i sell tube preamps, they sound great comparing to op-amps, even my 22 years old Delco radio in my Oldsmobile sounds great, because there are no op-amps.
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