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Old 1st March 2003, 06:42 PM   #1
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Default AD826 or OPA2134

Has anyone compared the AD826 against the OPA2134 in the same application ? How did they compare ?
Would anyone know which one is better for an IV stage for a DAC.
Cheers.
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Old 1st March 2003, 07:52 PM   #2
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Check AD8620, state of the art, well at the top at least.
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Old 2nd March 2003, 04:51 AM   #3
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Default AD8620

Hi Peranders,
I do have the AD8620 but I do not have a DIP adapter for it.
I received the AD826 from a friend .It is a dip version and I could pull out my existing IV from the DAC board and put in the 826. I wanted to know if anyone has compared these .
OK, I guess I will do this now and let you know what happens.
Cheers.
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Old 2nd March 2003, 08:24 AM   #4
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Default Re: AD8620

Quote:
Originally posted by ashok
Hi Peranders,
I do have the AD8620 but I do not have a DIP adapter for it.
It's not very hard to attach a SOIC into a ordinary DIL socket.

Start to solder 8 wires in the socket, then bend them and cut them. The last thing is to solder the SOIC chip.

The best socket here is a component adapter, socket for resistors, caps etc.
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Old 12th March 2003, 04:10 AM   #5
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Default Listening test

I put this up in a new thread which is not right. So I am copying it here again and hop esomeone has some views of their own.

I have used the following as the buffer gain stage between a passive LC filter and the power amp. The DAC is a TDA1541.
1. OPA2134 gain stage with voltage series feedback.
2. AD826 used instead of the the OPA2134.
3. 6SL7 tube SRPP gain stage with voltage shunt feedback.
So I can use any one of these ( one at a time !).

The AD826 seems to be smoother than the OPA in the voice range. But deep bass and transients seem more punchy in the OPA2134. The difference is audible and I would like to know why. Only the chips are changed. So what's happening?

The tube stage beats the AD and the OPA by miles. The vocals are superb and transient attack and deep bass are incredible. The tube however would loose out in the distortion and signal to noise figures. Who cares , under normal ( loud) listening levels I can't hear those problems. So all the opamp IV users try out a simple tube stage. You might be in for a shock !
That's what's great about audio. At every turn there's something new. It will outlive me and that's what I want.

I will try out the 8620 as soon as I solder it to an adapter.
Cheers.
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