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-   -   Current source on 3886 mute pin (http://www.diyaudio.com/forums/chip-amps/216922-current-source-3886-mute-pin.html)

Michael Bean 28th July 2012 04:51 PM

Current source on 3886 mute pin
 
Hi All...

I was just sittin' here idling away some time when outta nowhere this question pops into my brain; since I don't normally use the mute function on a LM3886, would there be any audible benefit to using an active current source instead of the usual resistor?

Any thoughts?

Mike

diy_audio_fo 28th July 2012 06:09 PM

Quote:

Originally Posted by Michael Bean (Post 3107461)
Hi All...

I was just sittin' here idling away some time when outta nowhere this question pops into my brain; since I don't normally use the mute function on a LM3886, would there be any audible benefit to using an active current source instead of the usual resistor?

Any thoughts?

Mike

Look at

http://www.rane.com/pdf/old/ma3sch.pdf

the schematic of MA3 amplifier by Rane (Rane Corporation)

Michael Bean 28th July 2012 07:03 PM

Thanks, but that doesn't really answer my question whether or not there would be any audible benefit to doing it. I suppose I could get off my lazy butt and try it, but I thought I'd see if anyone here has already tried it.

Mike

djoffe 28th July 2012 08:45 PM

At least by straightforward simulations and thought experiments, there is no benefit to a current source on the mute pin. Having said that, I use a current source on the mute pin in my products...

for example, take a look at this assembly manual, the schematic one page from the end....Q2, D3, and R6 are a current source for the mute. But, if you look at the schematic of the LM3886 internals, it just switches an internal current source. I can't see any real difference, assuming responsible design.

http://www.updatemydynaco.com/docume...ualRev2.08.pdf

Michael Bean 29th July 2012 03:21 PM

Hi djoffe,

Yeah, I took another look at the data sheet and it appears you're right, there's probably nothing to gain by going active there.

So once agian, no marching bands or awards for my great ideas! Oh well;)


Mike


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