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I plan on doing an op-amp upgrade on my DVD player (Sony DVP-S7000) and saw something curious when I looked inside. There are two different pairs of op-amps inside on the audio board. It has two Mitsubishi 5238's & two JRC 2114's. When I swapped out the op-amps on my two CD players, all four of the op-amps in each player were the same.
Any ideas on why different op-amps are used on the same player?
BTW, the unit will mainly see audio use and I want to use the LM4562 in place of the stock parts.
TIA
Follow Ups:
Many times in slightly different capacities using different opamps may be necessary to get that nth degree level of perfection. For Example: notice the THD vs Vo graphs for the LM4562 and that they are really only an ultra low distortion amp for a small window of relatively high level output voltages. Say for example you needed the output voltage to be 10mV, look at the distortion then, yucko.
There is no doubt the 4562s are nice parts IF you use them correctly.
This is why there are so many differnt op amps in the world to choose from.
I've used the LM4562 as a drop in replacement in a Sony CDP-CA70ES with very good results. The performance was better than the OPA2134's that I installed previously in a similar CDP (Sony CDP-CA7ES).
Without a schematic the best way to tell what to replace it with is get in there with a scope and look at the input signal and what comes out the output for each amp while a known test signal is being driven through the circuit.
Since per data sheet specs LM4562s like being in the final preamp stage for best performance, it is probably pretty safe to drop one in for the final stage if you can figure out which one that is.
I'd be leery of just globaly replacing all opamps with them though as there are places they are bad choice too don't forget.
Not that they aren't a great choice for most all arouind audio stuff. It appears to me there are certain specific apps which might benefit from something more specialized to the task at hand. Like I pointed out earlier, the data sheet pretty clearly outlines the limitations of those parts you just need to understand those limitations.
If you don't have a scope you might start by just doing one at a time so you can compare before and after.
Thanks for the additional info. I think I will do one pair at a time to guage the results.
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