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Old 9th March 2008, 02:08 PM   #1
CJ900RR is offline CJ900RR  Sweden
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Default LM3886, mute question...

Short question. Is the cap in the mute-"network" really nessesary. Or is it just there to smoth out the mute function. Would a resistor to V- be enough to unmute the circuit?

What I can read from the datasheet it would be enough with the resistor, but I ask just to be shure.
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Old 9th March 2008, 02:21 PM   #2
Nordic is offline Nordic  South Africa
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The cap helps to delay the unmute, which helps avoid pops as the amp comes up to operating levels.
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Old 9th March 2008, 03:28 PM   #3
CJ900RR is offline CJ900RR  Sweden
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Thats what I thought. Thank you.
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Old 21st May 2013, 05:44 PM   #4
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Pls suggest me value of Rm for a power supply of 18-0-18v dc.

i have tried 22k, 10k, 5k, and 1.5k but its not getting unmute anycase.

However, when left opened, a little sound can be heard at full volume - indicates that ic is OK and under mute condition.

Guys, please help me on this!
Thanks!
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Old 21st May 2013, 06:37 PM   #5
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Do you have any cap? Notice the negative voltage. Have you read the datasheet for LM3886? Everything is there.
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Old 22nd May 2013, 10:33 AM   #6
AndrewT is offline AndrewT  Scotland
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Naz has opened a separate Thread for this question !
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Old 6th June 2013, 06:07 AM   #7
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Quote:
Originally Posted by CJ900RR View Post
Short question. Is the cap in the mute-"network" really nessesary. Or is it just there to smoth out the mute function. Would a resistor to V- be enough to unmute the circuit?

What I can read from the datasheet it would be enough with the resistor, but I ask just to be shure.
The resistor must be there all the time to "unmute" the amp. The cap creates a delay at startup. You should have at least 1 mA mute current so the resistor is calculated with this criteria.
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