Opamps changed => metallic sound

roibm · 21st March 2004, 08:05 PM

So, I finally changed all the opamps beside the opamps on the DAC(those are SMD and are not here yet).
I used OPA2132P for replacing them. The $.01 elcos bypass caps were replaced with pana fc for the same values(10uF and some 4.7uF)

What to say, it sounds much much better, a lot of fine details, but also somehow metallic(like a metallic resonance, mini-delay).

Any idea where is this comming from? OPA2132P?
Unfortunately I have no other opamps available...

Just for reference, the voltage fed to the opamps is +-15V

djk · 22nd March 2004, 05:00 AM

What do you have in parallel with the 10µF caps? Values in the range of 0.01µF~0.1µF are normally used. I like stacked film types for these.

Not all arbitrary combintion of bypass caps are stable. Ringing (imagine a mirrored hallway) can occur.

roibm · 22nd March 2004, 11:17 AM

At first I might have been wrong, it may be that those 10uF caps are not bypass caps but coupling caps(if the topology(?) is the same like in DAC).
And as they are right now, they got nothing in paralell, but I am thinking about getting something. Other possibility would be using some MKT(not enough space for MKP) eventually bypassing those as well(for best quality).

But could it be that the metallic sound is caused by these caps? I mean the old caps were worst, so was the old opamp.

21st March 2004, 08:05 PM	#1
roibm Banned Join Date: Dec 2003 Location: Transylvania	Opamps changed => metallic sound So, I finally changed all the opamps beside the opamps on the DAC(those are SMD and are not here yet). I used OPA2132P for replacing them. The $.01 elcos bypass caps were replaced with pana fc for the same values(10uF and some 4.7uF) What to say, it sounds much much better, a lot of fine details, but also somehow metallic(like a metallic resonance, mini-delay). Any idea where is this comming from? OPA2132P? Unfortunately I have no other opamps available... Just for reference, the voltage fed to the opamps is +-15V

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22nd March 2004, 05:00 AM	#2
djk diyAudio Member Join Date: Feb 2001 Location: USA	What do you have in parallel with the 10µF caps? Values in the range of 0.01µF~0.1µF are normally used. I like stacked film types for these. Not all arbitrary combintion of bypass caps are stable. Ringing (imagine a mirrored hallway) can occur.

22nd March 2004, 11:17 AM	#3
roibm Banned Join Date: Dec 2003 Location: Transylvania	At first I might have been wrong, it may be that those 10uF caps are not bypass caps but coupling caps(if the topology(?) is the same like in DAC). And as they are right now, they got nothing in paralell, but I am thinking about getting something. Other possibility would be using some MKT(not enough space for MKP) eventually bypassing those as well(for best quality). But could it be that the metallic sound is caused by these caps? I mean the old caps were worst, so was the old opamp.

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