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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: LM324 OPAMP upgrade posted by Mike on December 19, 2001 at 14:42:16:
LM324 has a disgustingly low slew rate (0.5), but one has to ask if a high slew rate is really called for in a sub-woofer?The device seems to be just four LM741's in a single package. There are some fairly sexy Burr Brown products that come in Quads, OPA134 and OPA134 come in quad packs (OPA4132 and OPA4134) but I don't think they are called for.
In fact you may well get a more meaty sound from an op amp with bipolar input (not the FET input of the Burr Brown product).
My suggestion is a Motorola device, the MC33079 (often listed as MC33079P). This has the same specs as the LM5532 except for a much friendlier input voltage range and I've found them to be far more reliable and robust - and it will drop into your amp.
Make sure you get the orientation right - mark the PCB if the orientation is not already marked. Some adjustments may have to be reset when changing OP amps (depending on where on the PCB/circuit it is - I suspect it is in the active crossover/low pass filter section in which case no adjustments need to be done).
Good Luck.
Kind Regards,
Robert Karl StonjekPS The link below will take you to a datasheet for the recommended Op Amp (note:this datasheet comes from the wholesaler. Don't place an order unless you happen to want 1,000 pieces!! :)
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Follow Ups
- Re: LM324 OPAMP upgrade - Robert Karl Stonjek 00:07:24 12/21/01 (1)
- Thanks Robert, great information - Mike 04:46:54 12/21/01 (0)
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