Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Options
View
Go to last post Go to first unread
biggsd  
#1 Posted : Monday, August 29, 2016 9:37:43 AM(UTC)
biggsd

Rank: Member

Groups: Member
Joined: 4/28/2013(UTC)
Posts: 55
New Zealand
Location: Auckland

Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
Hi everyone - Russ included :-)

So, i have finally got Muses 0p amps, and they sound great.

I tried the MUSES02 - sounds exactly as expected with very warm and less space in the tops.

With the MUSES01, i much prefer the sound with very powerful tops and spaciousness BUT i get these strange HF artefacts in the sound that I can't quite describe. Like when there is just a quiet period with an instrument playing, it kinda has this harmonic buzzing type noise that DOESNT appear on the balanced, or when I have the MUSES02s in there.

just the MUSES01's.

So questions
- Firstly, are the MUSES01s compatible with the Legato BAL/SE stage?
http://www.njr.com/semicon/PDF/MUSES02_E.pdf

My implementation has no buffers, or feedback as i found for my needs the cleanest was the best with my previous TL072s. Could this be the issue?

Keen to hear if anyone has experienced this or can shed some light as to why these strange hf artefacts occur, i can almost record it and post on here?
Russ White  
#2 Posted : Thursday, September 1, 2016 3:04:09 AM(UTC)
Russ White

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,978
Location: Nashville, TN

Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
t could just be that the op amp requires more feedback compensation or higher output resistance. I don't think I have never used those op amps.
biggsd  
#3 Posted : Friday, September 30, 2016 8:40:50 AM(UTC)
biggsd

Rank: Member

Groups: Member
Joined: 4/28/2013(UTC)
Posts: 55
New Zealand
Location: Auckland

Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
Still Struggling to get this going.. its really frustrating because they sound soooooo good but i can't used them cos of this noise issue. Kind of oscillation / cracking when the input amplitude goes too high...

Other op amps don't do this.

so i have tried 220p on the feedback cap - still no success.

When you say to increase output resistance do you mean increase R23 nd R22?

Just s a note i don't use the output buffers at all.

Output from op amp goes to the op amp output -> C6 -> R23 -> R26 -> output

I assume this is correct so total output resistance is then R23 + R26? so 4.99k + 22ohms.. right now.

Bene for some help here i really want to get this ops amp to go :-) thanks in advance :-)

Datasheet is here;
http://www.njr.com/semicon/PDF/MUSES01_E.pdf

Edited by user Friday, September 30, 2016 8:51:53 AM(UTC)  | Reason: Not specified

Russ White  
#4 Posted : Monday, October 17, 2016 7:12:50 PM(UTC)
Russ White

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,978
Location: Nashville, TN

Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
R25 and R26 are the resistors in question.

It could also be that it would do better with a reduction in feedback resistance (R17-24)

I would just be guessing. :)

I would pick a less finicky op-amp.
Rss Feed  Atom Feed
Users browsing this topic
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.