The Opamp thread
Sep 9, 2015 at 9:51 PM Post #4,981 of 7,383
So I just upgraded my computer to windows 10 and I swear it sounds differently. I checked all the settings and put it all on 24/192. I'm still using Foobar.
You know that tension you get in your shoulders when you put a crap opamp in or somehow some settings get messed up? The sound stage feels different. I detect some harshness that was not there before.
Are there some settings I am unaware of?
This might be a deal-breaker with windows 10 if I can't get it sorted. Any ideas?
 
Sep 10, 2015 at 2:21 PM Post #4,982 of 7,383
Install Gentoo instead.
 
Sep 12, 2015 at 2:36 AM Post #4,983 of 7,383
  So I just upgraded my computer to windows 10 and I swear it sounds differently. I checked all the settings and put it all on 24/192. I'm still using Foobar.
You know that tension you get in your shoulders when you put a crap opamp in or somehow some settings get messed up? The sound stage feels different. I detect some harshness that was not there before.
Are there some settings I am unaware of?
This might be a deal-breaker with windows 10 if I can't get it sorted. Any ideas?


Use ASIO plugin if your soundcard supports that.
 
Sep 12, 2015 at 7:12 AM Post #4,985 of 7,383
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  Install Gentoo instead.

+1
 
Sep 14, 2015 at 3:01 AM Post #4,987 of 7,383
  Couple of months ago I bought a PCM5102A based USB DAC from China (aliexpress), it has a headphone OUT and a LINE OUT. Headphone OUT uses AD8397 at single ended supply ~VDD=3.5V. So in order to just roll this with another opamp I ordered OPA2365, it works at that voltage fine but has a lower PSRR, which means I might need to add another bypass cap over it's pins. It sounds good for now, actually just satisfactory, just slightly better than my HTC Desire 820 Dual SIM.
 
I hope OPA2365 makes a difference, once I roll it I will let you know the first listening experience and also how it sounds after completing a week in that circuit. (The amp circuit actually is a Cmoy circuit)
 
What are the general impressions on OPA2365?

The headphone OUT is actually a single low voltage supply Cmoy with a 1000uF cap coupling capacitor on the output.
 
Any comments on the OPA2365?
 
Sep 14, 2015 at 4:51 AM Post #4,988 of 7,383
@imran27 
For headphone out, you need an opamp with extra current output. AD8397 is pretty good for that job due its 230 mA current peak. other opamp that could be used is LMH6643, which has single supply voltage design, but lower current output, @75mA.
Sorry dont have experience to OPA2365 
 
Sep 14, 2015 at 2:45 PM Post #4,989 of 7,383
you are likely going to find more improvement paralleling more capacitance to the 1000uF output cap, or replace with a large bipolar cap. (this assumes you are not limited in physical space)

otherwise work on the decoupling for the output opamp, get some tiny caps as close to the power pins as possible.

 Couple of months ago I bought a PCM5102A based USB DAC from China (aliexpress), it has a headphone OUT and a LINE OUT. Headphone OUT uses AD8397 at single ended supply ~VDD=3.5V. So in order to just roll this with another opamp I ordered OPA2365, it works at that voltage fine but has a lower PSRR, which means I might need to add another bypass cap over it's pins. It sounds good for now, actually just satisfactory, just slightly better than my HTC Desire 820 Dual SIM.
 
I hope OPA2365 makes a difference, once I roll it I will let you know the first listening experience and also how it sounds after completing a week in that circuit. (The amp circuit actually is a Cmoy circuit)
 
What are the general impressions on OPA2365?

The headphone OUT is actually a single low voltage supply Cmoy with a 1000uF cap coupling capacitor on the output.
 
Any comments on the OPA2365?
 
Sep 18, 2015 at 12:49 PM Post #4,992 of 7,383
That size.  Nope.
Not happening.
 
Sep 18, 2015 at 1:56 PM Post #4,993 of 7,383
you are likely going to find more improvement paralleling more capacitance to the 1000uF output cap, or replace with a large bipolar cap. (this assumes you are not limited in physical space)

otherwise work on the decoupling for the output opamp, get some tiny caps as close to the power pins as possible.


Unfortunately the BlackGate NX 1000 uF 25V are unavailable - this was the best in this case.
 
Sep 18, 2015 at 4:03 PM Post #4,994 of 7,383
 
Unfortunately the BlackGate NX 1000 uF 25V are unavailable - this was the best in this case.

 
DC-blocking cap, I assume?  Wouldn't it be better to use DC-blocking WIMA film caps?  That's what portable amps often use.  Pro audio equipment use SMD film caps of some kind for that as well.
 
Sep 18, 2015 at 8:35 PM Post #4,995 of 7,383
  Looks like there is a new opamp in town. 
 


 
I have the Lycan on order with the new v5.  They did share a link to a non published page on the v5 I thought I would make it available.
 
http://www.ssaudio.com.au/products/supreme-sound-opamp-v5/
 
I bought 4 of an earlier generation for my RSA Apache but never got them to fit right.  I plan to try them with the Lycan.  I also have some extra RSA AD797 to try so this should be interesting.
 

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