[LM3886] Best resistor value for mute ? - Page 2 - diyAudio
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Old 9th November 2005, 06:40 PM   #11
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Quote:
Originally posted by XELB
Attached, Page 7 of the LM3886 Schematic
I repeat, there's no schematic on page 7.
Or else we don't have the same LM3886 datasheet. Different revision?
That schematic is on page 6.

If you point to a page that has no schematic, it's hard to know what you're talking about.
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Old 9th November 2005, 06:56 PM   #12
XELB is offline XELB  Portugal
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Mine schematic is dated from October 2003.


Maybe you need to update yours because in this version there's a schematic in page 7, like I posted



Let's change subject....




Did you made any research on this, like you did for the snubber ?
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Old 9th November 2005, 06:57 PM   #13
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Well, as a matter of fact there is a simplified schematics on page 7 at October 2003 datasheet. Carlos, you probably have the one dated April 1995 which has graphs on page 7 and simpl. sch. at page 5.

But I think it is irrelevant, you both have the same simpl. sch. with 1k.

Another thing. Aren't we trying to improve something and check other meaningfull values??
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Old 9th November 2005, 07:23 PM   #14
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Datasheet tells more than 0.5 mA and max 10 mA.... or the diagram ends there. Sure you can test other values but 10 k seems to be OK in most situations.

Carlos, good for that your amp works as good as you say. From what I read far from every Gainclone has silent power on.
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Old 9th November 2005, 07:34 PM   #15
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Quote:
Originally posted by peranders
Carlos, good for that your amp works as good as you say. From what I read far from every Gainclone has silent power on.
I don't have a 'Gainclone'.
And I don't have op-amp buffers on-board, I have a standalone pre (AD815), which is powered on before the power amp.
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Old 9th November 2005, 07:49 PM   #16
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LM38xx amp, Gainclone like.... better? You are lucky but not everyone are as you may have noticed.
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Old 9th November 2005, 07:56 PM   #17
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Quote:
Originally posted by shusha
Carlos, you probably have the one dated April 1995 which has graphs on page 7 and simpl. sch. at page 5.
I had the 2000 datasheet, and it has on page 6.
Just updated now.
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Old 9th November 2005, 08:03 PM   #18
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Quote:
Originally posted by peranders
LM38xx amp, Gainclone like.... better? You are lucky but not everyone are as you may have noticed.
I just don't like 'Gainclone' because that means a copy of the Gaincard. Which is a copy of the datasheet.
It is not what I'm doing, and your amp is not too.
Or is it?

Anyway, back to my point: the LM3886 alone is silent at power on, even without the mute cap.
You have an op-amp gainstage and a servo on your amp, so you did well in using it.
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Old 9th November 2005, 08:13 PM   #19
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I think the Gainclone now has turned into an amp with LM3875 or LM3886.

The servo of my amp creates a minimal turn-on thump becasue it starts to work before the amp is working due to the built-in undervoltage protection of the LM3886. I have this mute capacitor as an option. Skip it if you don't like it.
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Old 9th November 2005, 08:34 PM   #20
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Quote:
Originally posted by peranders
I think the Gainclone now has turned into an amp with LM3875 or LM3886.
For you, not for me.
For me it's a chipamp.

Quote:
Originally posted by peranders
I have this mute capacitor as an option. Skip it if you don't like it.
Everything is optional, including the amp.
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