OPA2134 vs. AD8610

bmwrob · 5th May 2002, 07:35 AM

I planed a while ago to replace my OPA2134 in my Pioneer AX10 to the OPA627. Unfortunately the single to dual adapter I looked at simple didn't fit into the very tight space of the AX10. Now I noticed that Browndog has a very compact adapter for this purpose, so I'm considering do give it a try again. If I do, I think I will go for the AD8610 instead for the OPA627. Do you guys have any comments on that? Will the AD8610 be suitable as both an I/V and filter replacement for the 2134?

morsel · 5th May 2002, 08:56 AM

Make sure the supply voltage is ±12V or less, as the AD8610 has a max voltage limit of ±13.6V which you don't want to get too close to. If your CD player uses ±15V then use the AD825 instead, which maxes at ±18V.

PhopsonNY · 5th May 2002, 03:32 PM

Hi Morsel,

As I said in other posts, I am using the 8610 for I/V conversion.

What do you think of it for filter purposes...to replace the AD712?

cheers

bmwrob · 5th May 2002, 04:06 PM

I will check the voltage out and see if the 8610 are suitable.
Regarding my filter question. As I don't know which of the four 2134 per channel that is for I/V conversion and which are (if they are?) the filter, I was thinking about replacing all of them. Do you see any problem with that?

morsel · 5th May 2002, 09:25 PM

I have not upgraded my CD player yet, so I do not speak from personal experience, but judging from the spec sheets and the outstanding performance of the AD8610 in other applications such as a headphone amp I am building, it is probably a great choice for the I/V converter, filter, and line out of the CD player.

I have a Denon DCD-1420 which uses various Japanese opamps such as the 2068, 4556, and 4570. I'm not sure how much of an improvement the opamp swap will achieve, but it will be interesting to see. I'm not expecting miracles, but more sweetness and less grain would be nice.

The circuit board for the CD player headphone out section is upside down, inaccessible from the main compartment, and requires major disassembly to get a look at. I might be tempted to use an opamp with higher output current for the headphone out if the opamp drives the headphones directly, but if the opamp is buffered then the AD8610 is probably the best choice again.

There are many good opamps to choose from, get a variety if you can, and compare them. The differences become subtle at a high level of performance. I'm in the process of comparing several opamps for use in headphone amplifiers and CD players, including the AD8610, AD825, AD8512, AD823, AD826, OPA2132, and a few others. I've also been working on a custom audio test tone CD to help evaluate the opamps and the CD player. So much to do.

PhopsonNY · 6th May 2002, 10:52 PM

What do you think as the Ad8512 as a replacement for the Ad712 as a buffer, filter, servo and cable driver?

According to analog's info on

http://www.analog.com/technology/amp...-AMP-12-01.pdf

Seems they designed it as just this...

morsel · 7th May 2002, 01:49 AM

I just answered in another thread. I have a couple of AD8510 I plan to try out later in the week after some adapters show up, but I'm guessing the AD8610 or AD825 will turn out to be better.

bmwrob · 18th May 2002, 02:47 PM

I've verified that the AX10 OPA2134 are feed with +/-12V so it should be okay with the AD8610. Can't find them here in HK. Any ideas where I can order them from?

fmak · 18th May 2002, 03:20 PM

Quote:

Originally posted by bmwrob
I planed a while ago to replace my OPA2134 in my Pioneer AX10 to the OPA627. Unfortunately the single to dual adapter I looked at simple didn't fit into the very tight space of the AX10. Now I noticed that Browndog has a very compact adapter for this purpose, so I'm considering do give it a try again. If I do, I think I will go for the AD8610 instead for the OPA627. Do you guys have any comments on that? Will the AD8610 be suitable as both an I/V and filter replacement for the 2134?

-------------------------------------------------------------------------

The 8610 sounds better than the 627 as both filter/buffer and I/V. If it s I/V, a faster settling opamp than the 627 or 8610 appears (and sounds to me) desirable.

Use the 825 or 826 for I/V

fmak · 18th May 2002, 03:23 PM

Quote:

Originally posted by bmwrob
I've verified that the AX10 OPA2134 are feed with +/-12V so it should be okay with the AD8610. Can't find them here in HK. Any ideas where I can order them from?

-----------------------------------------------------------

RS haas a HK catalogue. So has Farnell.

5th May 2002, 07:35 AM	#1
bmwrob diyAudio Member Join Date: May 2002 Location: Thailand	OPA2134 vs. AD8610 I planed a while ago to replace my OPA2134 in my Pioneer AX10 to the OPA627. Unfortunately the single to dual adapter I looked at simple didn't fit into the very tight space of the AX10. Now I noticed that Browndog has a very compact adapter for this purpose, so I'm considering do give it a try again. If I do, I think I will go for the AD8610 instead for the OPA627. Do you guys have any comments on that? Will the AD8610 be suitable as both an I/V and filter replacement for the 2134? __________________ BR /// Rob

5th May 2002, 03:32 PM	#3
PhopsonNY diyAudio Member Join Date: Feb 2002 Location: New York	Is the AD8610 also good as a filter Hi Morsel, As I said in other posts, I am using the 8610 for I/V conversion. What do you think of it for filter purposes...to replace the AD712? cheers

5th May 2002, 04:06 PM	#4
bmwrob diyAudio Member Join Date: May 2002 Location: Thailand	I will check the voltage out and see if the 8610 are suitable. Regarding my filter question. As I don't know which of the four 2134 per channel that is for I/V conversion and which are (if they are?) the filter, I was thinking about replacing all of them. Do you see any problem with that? __________________ BR /// Rob

6th May 2002, 10:52 PM	#6
PhopsonNY diyAudio Member Join Date: Feb 2002 Location: New York	ad8512 as replacement for ad712 ? What do you think as the Ad8512 as a replacement for the Ad712 as a buffer, filter, servo and cable driver? According to analog's info on http://www.analog.com/technology/amp...-AMP-12-01.pdf Seems they designed it as just this...

18th May 2002, 02:47 PM	#8
bmwrob diyAudio Member Join Date: May 2002 Location: Thailand	I've verified that the AX10 OPA2134 are feed with +/-12V so it should be okay with the AD8610. Can't find them here in HK. Any ideas where I can order them from? __________________ BR /// Rob


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5th May 2002, 08:56 AM	#2
morsel diyAudio Member Join Date: Apr 2002 Location: Mountain View, California USA	Make sure the supply voltage is ±12V or less, as the AD8610 has a max voltage limit of ±13.6V which you don't want to get too close to. If your CD player uses ±15V then use the AD825 instead, which maxes at ±18V.

5th May 2002, 09:25 PM	#5
morsel diyAudio Member Join Date: Apr 2002 Location: Mountain View, California USA	I have not upgraded my CD player yet, so I do not speak from personal experience, but judging from the spec sheets and the outstanding performance of the AD8610 in other applications such as a headphone amp I am building, it is probably a great choice for the I/V converter, filter, and line out of the CD player. I have a Denon DCD-1420 which uses various Japanese opamps such as the 2068, 4556, and 4570. I'm not sure how much of an improvement the opamp swap will achieve, but it will be interesting to see. I'm not expecting miracles, but more sweetness and less grain would be nice. The circuit board for the CD player headphone out section is upside down, inaccessible from the main compartment, and requires major disassembly to get a look at. I might be tempted to use an opamp with higher output current for the headphone out if the opamp drives the headphones directly, but if the opamp is buffered then the AD8610 is probably the best choice again. There are many good opamps to choose from, get a variety if you can, and compare them. The differences become subtle at a high level of performance. I'm in the process of comparing several opamps for use in headphone amplifiers and CD players, including the AD8610, AD825, AD8512, AD823, AD826, OPA2132, and a few others. I've also been working on a custom audio test tone CD to help evaluate the opamps and the CD player. So much to do.

7th May 2002, 01:49 AM	#7
morsel diyAudio Member Join Date: Apr 2002 Location: Mountain View, California USA	I just answered in another thread. I have a couple of AD8510 I plan to try out later in the week after some adapters show up, but I'm guessing the AD8610 or AD825 will turn out to be better.

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