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Old 20th July 2013, 04:13 AM   #1
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Smile Drop-in replacement for JRC4558

I bought a car dvd recently. Everything is fine except ... the sound quality. For fun, I would like to upgrade the JRC4558 chips (and TDA7338 probably) on the circuit board to some better ones to see if there's any improvement. My question is, is OPA2132U a good drop-in replacement for it? What's the difference between OPA2132U and OPA2132UA?

Also, it seems there are many other chips that I could use, e.g. OPA2228, OPA2134, etc. Which one is better?

Any suggestions are welcome! Thanks!
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Old 20th July 2013, 06:13 AM   #2
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5532 will work like a charm ...Though termination of output filtering of output and configuration of the circuit will also play a very big role

meaning that 4558 may as well play properly if configured properly
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Old 22nd July 2013, 09:46 AM   #3
AndrewT is offline AndrewT  Scotland
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The best drop in replacement for a JRC4558 is, a JRC4558 !

Have you read about the potential pitfalls of opamp rolling?
Read some of the very informative Threads on this Forum.
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Old 14th July 2015, 08:26 PM   #4
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Reviving an old thread, but this one didn't get far the first time around so I figured I'd give it a kick and see if it wakes up.

Following from AndrewT's advice, I'd simply like to ask; is there another opamp (or opamps) that is similar enough in design to the various 4558 chips, and well-behaved enough, that it could be dropped into a circuit with a reasonable expectation of working? Let's ignore whether this might be considered an "upgrade" for now.

Assume in this case that the circuit was well-designed to begin with, and that the 4558 was chosen due to low cost, not due to some unique performance benefit of the 4558.

Another way to look at it; despite it being a "bad idea", if you had to choose one opamp to blindly drop in to a circuit built around 4558 chip(s), what opamp would you drop in there?

(Answers of "NJM4558", "MC4558", etc. don't count. )

Last edited by cogitech; 14th July 2015 at 08:28 PM.
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Old 15th July 2015, 12:52 AM   #5
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NE5532
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Old 15th July 2015, 07:05 PM   #6
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Thanks Capt Grogg.

Seems the NJM2068 might be a good bet, too.
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Old 15th July 2015, 07:13 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

Hands down the 5532 for any general circuit.
The NJM2068 is a good option for gains < 5.

rgds, sreten.
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Old 17th July 2015, 06:54 PM   #8
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by cogitech View Post
Another way to look at it; despite it being a "bad idea", if you had to choose one opamp to blindly drop in to a circuit built around 4558 chip(s), what opamp would you drop in there?
Toss up between an LM4562 (much higher power consumption) or a TL072 (great all rounder). Honest answer... I'd probably go with the TL072 based on your criteria.
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Old 17th July 2015, 07:04 PM   #9
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Interesting. Thanks Mooly.

I am tempted to install DIP-8 sockets everywhere. The opamps being discussed can all be bought for very little money (except 4562). Nothing stopping me from trying a few types.
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Old 17th July 2015, 07:09 PM   #10
Mooly is offline Mooly  United Kingdom
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If you have a few opamps in one piece of equipment then you seriously need to consider power consumption. Although each only draws milliamps, the difference between ten 15ma chips and ten 4ma chips is significant and the original supply arrangement may well not cope.
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