Opamp

Stitch333 · 18th November 2006, 04:26 AM

I'm screwin around with a micpre. The chip is a NJM082BL SIP8 format opamp. It seems pretty stock and maybe even chinese. Would replacing this chip improve the performance of said pre? If yes, what other parts/companies make higher quality IC opamps? Thanks, mangs...

Matt Syson · 18th November 2006, 10:53 PM

Hi
NJM is not necessarily bad, it depends what function it is actually doing.
You have a choice. Cheap stuff that is made in China or expensive stuff made elsewhere. (NJM are not Chinese but Japanese owned).
Matt S

Jim Williams · 22nd November 2006, 06:08 PM

It's a TL082 dual fet input opamp, you know, the one's that drove up the prices for discrete English consoles...

Without circuit mods, an opamp with a 2~3 mhz gain bandwidth would work well, wider opamps may need some "housecleaning" with phase compensation and power supply decoupling. Try a Linear Tech LT1352 dual in there, it's a very low power opamp (260 ua supply current) with a very good 200 v/us slew rate and low distortion and noise. Yes, it's available from Digi Key in S0-8 packages.

Jim Williams
Audio Upgrades

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18th November 2006, 04:26 AM	#1
Stitch333 Lives for gear Join Date: Aug 2006 Location: Phila, PA/Upstate MA Posts: 2,346	Opamp I'm screwin around with a micpre. The chip is a NJM082BL SIP8 format opamp. It seems pretty stock and maybe even chinese. Would replacing this chip improve the performance of said pre? If yes, what other parts/companies make higher quality IC opamps? Thanks, mangs... __________________ www.myspace.com/stitchproductions "Half shark, half man, skin like alligator...carrying a dead walrus..." "I think this sheet metal that says NEVE on it can be made into a mic pre. It already sounds better than anything else I own." -D.W.

18th November 2006, 10:53 PM	#2
Matt Syson Lives for gear Join Date: Sep 2004 Location: UK Posts: 1,489	Hi NJM is not necessarily bad, it depends what function it is actually doing. You have a choice. Cheap stuff that is made in China or expensive stuff made elsewhere. (NJM are not Chinese but Japanese owned). Matt S __________________ Matt S www.mseaudio.co.uk

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22nd November 2006, 06:08 PM	#3
Jim Williams Lives for gear Join Date: Feb 2004 Location: beautiful Carlsbad, CA Posts: 4,317	It's a TL082 dual fet input opamp, you know, the one's that drove up the prices for discrete English consoles... Without circuit mods, an opamp with a 2~3 mhz gain bandwidth would work well, wider opamps may need some "housecleaning" with phase compensation and power supply decoupling. Try a Linear Tech LT1352 dual in there, it's a very low power opamp (260 ua supply current) with a very good 200 v/us slew rate and low distortion and noise. Yes, it's available from Digi Key in S0-8 packages. Jim Williams Audio Upgrades