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Old 23rd December 2012, 01:50 PM   #1
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Default Current required for B1 buffer + chipamp

Hi all:

I'm attempting my first DIY build with a LM3886 stereo kit from chipamp.com and a Pass B1 buffer. If I put them all in the same chassis, are there any problems with powering the B1 from the chipamp.com snubber board? I think the B1 draws on the order of 10's of milliamps which seems modest.

Thanks,
John
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Old 23rd December 2012, 03:10 PM   #2
JMFahey is offline JMFahey  Argentina
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Probably.
Personally, can't see the need to add a unity gain buffer between a 25K volume pot and a 100K chip amp input ... unless they are 1/4 mile away, of course (which does not seem to be the case) .
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Old 23rd December 2012, 03:33 PM   #3
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My DCB1 draws around 6W of power.
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Old 23rd December 2012, 04:11 PM   #4
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Quote:
Originally Posted by JMFahey View Post
Probably.
Personally, can't see the need to add a unity gain buffer between a 25K volume pot and a 100K chip amp input ... unless they are 1/4 mile away, of course (which does not seem to be the case) .
Hmmmm . . . just assumed that an amp required a pre-amp. Noob mistake?
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Old 23rd December 2012, 10:26 PM   #5
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Depends on what you are looking for. If you want to have a source selector, volume control, and couple of meters of interconnects, then yes, you need a preamp. But a B1 in the same box with a chipamp, which would literally be a unity gain buffer between a volume pot and a 100k (or so) input of a chipamp, makes little sense.
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