AD8610, OPA134, OPA627, BUF634 SMD headphone amp - Page 8 - diyAudio
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Old 17th October 2007, 02:39 PM   #71
Electrons are yellow and more is better!
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I haven't checked with them but the main problem now is that TI doesn't manufacture it, "allocated"....
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Old 18th October 2007, 11:38 AM   #72
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Per-Anders,

I have a few of the DPACK 634:s.
Send me an email.





Sigurd
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Old 29th June 2011, 08:20 AM   #73
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Quote:
Originally Posted by peranders View Post
Today I have both tested and listened to OPA627, OPA134 and AD8610 (at +- 15V, didn't die!). Electrically AD8610 is outstanding, can handle too large signals excellent, offset at the out 0.046 mV cold and 0.079 mV warm!!! The OPA627 can't handle large signals at high frequencies very well. It may be better if the signal is DC connected.

OPA134 is also excellent but have slightly higher offset, 2.5 mV at the output. I have also tested the buffer at medium speed mode and high speed mode, no visible or audioable change. Soundwise all opamps do their work very good. I (my ears) can't hear any major difference.

I notice also that groundplane pcb cools rather good. BUF634 in high speed mode gets rather hot. Also the regulators are rather well cooled.

Some guy here (forget the name right now) has elevated AD8610 to the skies and must admit, it's a good opamp!
Hi, are you still using AD8610 supplied on 15v?
I would like to try it in my preamp which is also 15V, but maximum voltage of AD8610 is 13V only.
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Old 10th March 2013, 08:43 AM   #74
Electrons are yellow and more is better!
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Works still.... but I don't recommend it if you can choose.
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Old 12th March 2013, 03:28 AM   #75
agdr is offline agdr  United States
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Hey P-A, I didn't know you had a OPA627 amp in your collection! I was actually thinking of using the BUF634 at one point for this ODA thing I'm working on but then figured parallel NJM4556As would be more in keeping with the O2. Good thing I didn't use BUF634s, I would have just re-created the wheel for no reason. That looks like a good amp you have there. I know that a thread from a few years ago by Maxhawk with a OPA627 and BUF634 came to life again a week or two ago. That also looked like a pretty good design.

I'm making no claims whatsoever on performance for my OPA627 + NJM4556A thing, just done for fun. A beefed up CMOY. Your amp there on the other hand probably delivers some pretty well-measuring sound.

I just took a look at the schematic on your site and see you have the trim added. I did wind up stuffing those PC holes after all on mine. The first channel I built up didn't need it, but the second did when I got the chips in. Using the trimmer I was able to zero most of about 100uV of offset.

Last edited by agdr; 12th March 2013 at 03:34 AM.
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Old 18th March 2013, 10:01 AM   #76
qusp is offline qusp  Australia
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it was a popular combo back in the day. I also have a portable amp with OPA637 + 8 stacked BUF634
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