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Old 10th May 2010, 01:47 PM   #941
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by SRMcGee View Post
Sorry for what may be a particularly dumb question
don't apologise. No question is dumb.

This is a very good question.

What will the circuit try to do if the 3886 part enters mute mode?
Could the opamp survive this loading. Could it be operated outside of specification.
Will the 3886 mute function work as a mute when it is operated as a current source?
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Old 10th May 2010, 03:09 PM   #942
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Quote:
Originally Posted by SRMcGee View Post
Folks:

Sorry for what may be a particularly dumb question, but is there a simple way to implement a mute function with the MyRef RevC?

Thank you,
Scott
Yep, just look at the datasheet for the "mute" pin. It should be tied to -v through a 33k res or so. Just place a switch in there, so when it is "open", it will get muted.
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Old 10th May 2010, 03:35 PM   #943
troystg is offline troystg  United States
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I may be mistaken, but I think Mauro originally stated that the mute function could NOT be used in this implementation...
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Old 10th May 2010, 06:49 PM   #944
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I may be mistaken, but I think Mauro originally stated that the mute function could NOT be used in this implementation...
mmmmm something about it comes to my mind. Something about being nested in the LM318 feedback loop and the mute function causing some instabilities.
Anybody out there with better memory?
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Old 10th May 2010, 07:43 PM   #945
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by AndrewT View Post
What will the circuit try to do if the 3886 part enters mute mode?
Could the opamp survive this loading. Could it be operated outside of specification.
Will the 3886 mute function work as a mute when it is operated as a current source?
Quote:
Originally Posted by regiregi22 View Post
look at the datasheet for the "mute" pin. ............... Just place a switch in there, so when it is "open", it will get muted.
Quote:
Originally Posted by regiregi22 View Post
Something about being nested in the LM318 feedback loop and the mute function causing some instabilities.
Regi,
do you read?
Read again the expanded three questions following SRMcGee post.
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Old 10th May 2010, 08:02 PM   #946
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My apologies Andrew, I was at work, where the forum is seen like a crap. Login doesnt work well, website doesnt reload properly...I couldnt read your post.

Now I understand why it cannot be implemented, closer to what I had in mind. Thank you.

Sorry for that again, regards

Regi
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Old 11th May 2010, 01:00 PM   #947
SRMcGee is offline SRMcGee  United States
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Folks:

Okay, since it appears that I cannot exploit the mute function on the MyRef RevC LM3886, perhaps a relay can be used. Does it make any sonic difference where a "mute" relay is used in the circuit? This project involves a Pedja Rogic buffer, Lightspeed attenuator and the MyRef RevC, and the relay could be placed before or after any of these stages.

Regards,
Scott
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Old 11th May 2010, 01:05 PM   #948
AndrewT is offline AndrewT  Scotland
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Hi,
you could place an input mute activated by loss of mains power on any of the inputs.
I would be tempted to put one on the front end of MyRevC and also put one on the input to the pre-amp. But only if the source can drive the muted circuit without damage.

Have you read the threads talking about the LDRs and what happens when they are powered down?

As an aside.
The same MyRevC input muting relay could also be activated on detection of excessive output DC. Just in case it is a preceding source that has gone faulty.
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Last edited by AndrewT; 11th May 2010 at 01:07 PM.
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Old 11th May 2010, 01:09 PM   #949
SRMcGee is offline SRMcGee  United States
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Andrew:

Man, you're quick! I had read the LDR threads but must have missed the discussion regarding what happens when they power down -- thank you for the pointer. I'll take another look.

Much appreciated!

Regards,
Scott
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Old 11th May 2010, 01:24 PM   #950
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Why not forcing the protection relay to kick in? I have added a switch to the MyRef_C protection circuit schematic. Anybody see anything wrong with that?

Will it correctly work?
Attached Images
File Type: jpg MUTE_MYREF.JPG (46.4 KB, 268 views)
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