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Old 26th August 2007, 04:42 AM   #1
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Default Quad Op Amp..............

Hi people

I was plaining to upgrade the OP-amplifiers in my car audio amp JBL px300.4 but i found out that it uses quad op amps version of JRC 2058D so i need advice for some better quality quad op amp.

p.s 2058D has the same electrical characteristics of JRC 4558


Thak you

Bye Alex
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Old 26th August 2007, 05:31 PM   #2
macboy is offline macboy  Canada
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Burr Brown makes quad versions of their OPA134 and OPA132: they are the OPA4134 and OPA4132. These are both FET input opamps, whereas the 2058/4558 is a bipolar input. They are also much faster than the 4558. Therefore they are not necessarily a drop-in replacement. In order to get optimum noise performance, and to ensure stability, you would need to re-evaluate the other components in the system, such as the value of the input and feedback resistors, etc.

One which is more likely to be a direct drop-in is the National LM837. It has similar performance to the NE5532, much better than the 2058. Specs include: distortion 0.0015%, noise 4.5 nV/sqrt(Hz), GBWP 25 MHz. Most people around here wouldn't call it audiophile quality, but it will be a big improvement.
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Old 27th August 2007, 06:43 AM   #3
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Thanks for the reply MacBoy
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Old 27th August 2007, 04:54 PM   #4
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The LME49740 would be my first choice...

http://www.national.com/pf/LM/LME49740.html

Cheers!
Russ
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Old 27th August 2007, 11:31 PM   #5
Ryssen is offline Ryssen  Sweden
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Old 29th August 2007, 10:37 AM   #6
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Thank again guys for the reply

Also i would like ot ask you one question more about the same amp:

Ive found that it uses TL072CP op Amps from Texas Instruments so would it be nice that i will replace those one with op275 or ad826 because those one i have in the moment, what do you recommend?

Also these op ams i have in the subwofer monoblock amp JBL 1201.1 whould it be nice to replace them also in the subwofer amp so i will get tighter bass............Also this subfower amp uses one JRC A4003B i should replace it with LME49740MA?

TL072Cp
Low Power Consumption
 Wide Common-Mode and Differential
Voltage Ranges
 Low Input Bias and Offset Currents
 Output Short-Circuit Protection
 Low Total Harmonic Distortion
0.003% Typ
 Low Noise
Vn = 18 nV//Hz Typ at f = 1 kHz
 High Input Impedance . . . JFET Input Stage
 Internal Frequency Compensation
 Latch-Up-Free Operation
 High Slew Rate . . . 13 V/ms Typ
 Common-Mode Input Voltage Range
Includes VCC+


The JFET-input operational amplifiers in the TL07_ series are designed as low-noise versions of the TL08_
series amplifiers with low input bias and offset currents and fast slew rate. The low harmonic distortion and low
noise make the TL07_ series ideally suited for high-fidelity and audio preamplifier applications. Each amplifier
features JFET inputs (for high input impedance) coupled with bipolar output stages integrated on a single
monolithic chip.


Supply voltage, VCC+ (see Note 1). . .. . . . . . . . . 18 V
Supply voltage, VCC (see Note 1) . . . . . . . . . . . 18 V
Differential input voltage, VID (see Note 2) . . . . 30 V
Input voltage, VI (see Notes 1 and 3) . . . . . . . . 15 V
Duration of output short circuit (see Note 4) . . . . unlimited
Continuous total power dissipation. . . See Dissipation
Unity Gain Bandwith ...................... 3mhz


Thanks Again to all

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Old 15th July 2012, 07:55 PM   #7
RCruz is offline RCruz  Switzerland
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Hi all

I need a replacement for a AN6554 Quadruple opamp... is LME49740MA a good alternative ?

It will be used in the output stage of a technics tuner that I am upgrading.

Regards

Ricardo
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