Filburt
Headphoneus Supremus
- Joined
- Jun 23, 2005
- Posts
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I didn't find the AD8397's soundstage very narrow, personally; it seems to perform more happily when not using a 'ground channel' in my experience.
IMO, most op-amps are not really suited for this type of application. If you're running at 6V, use an OPA2365 or AD8397. Up to 12V, you could either try the ADA4899-1 or the OPA656 I guess, though make sure to use the Ib cancellation on the 4899 if you use that. Those are single channel op-amps. If you're more sophisticated, and feeling very adventurous, you could try the AD8099 but it takes more effort to get it stable. It needs external comp (think NP0 SMD cap) to run below gain 15, but will go down to gain 2 with such comp. Would need ample bypassing and a non-standard feedback loop. Fun chip, though, and has an Ib cancellation circuit to get it down to 100nA or so. However, it's not for beginners.
I thought that AD825 was decent; I guess you could try that *shrug*.
Also make sure, whatever you use, that you have proper rail bypass so you can get optimal performance. Just because the thing isn't squealing and burning up doesn't mean it won't benefit from implementing proper supply design. For adaptors, I'd use either the ones made by Aries (or something similar), or maybe the ones Per-Anders makes as those would make bypassing easier.
IMO, most op-amps are not really suited for this type of application. If you're running at 6V, use an OPA2365 or AD8397. Up to 12V, you could either try the ADA4899-1 or the OPA656 I guess, though make sure to use the Ib cancellation on the 4899 if you use that. Those are single channel op-amps. If you're more sophisticated, and feeling very adventurous, you could try the AD8099 but it takes more effort to get it stable. It needs external comp (think NP0 SMD cap) to run below gain 15, but will go down to gain 2 with such comp. Would need ample bypassing and a non-standard feedback loop. Fun chip, though, and has an Ib cancellation circuit to get it down to 100nA or so. However, it's not for beginners.
I thought that AD825 was decent; I guess you could try that *shrug*.
Also make sure, whatever you use, that you have proper rail bypass so you can get optimal performance. Just because the thing isn't squealing and burning up doesn't mean it won't benefit from implementing proper supply design. For adaptors, I'd use either the ones made by Aries (or something similar), or maybe the ones Per-Anders makes as those would make bypassing easier.