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Recording Signal attenuation questions



 
 
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Old July 29th 04, 05:52 PM posted to uk.rec.audio
Keith G
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Posts: 7,388
Default Recording Signal attenuation questions


"Glenn Booth" wrote

That's what I do. I use a low end Spirit Folio mixer between the source
(RIAA preamp) and the card inputs. I set the levels on the mixer, while
keeping an eye on the level meters of the sound card. The metering on
the Folio is almost worthless anyway, and I only use it to get the
signal levels vaguely right.

My signal path goes TT Gram amp Folio (stereo in) sound card.
The Folio has a couple of RIAA preamps but they aren't very good, so I
avoid them.



OK, looks like I'll be going:

TT Phono Stage Attenuator Computer or (dammit) Soundcard....


That will probably be fine. It will introduce a change in the input and
output impedances, but if you pick the right value pot I doubt you'll
have any problems. It will probably depend on how fussy the preamp
feeding the pot is about the load it sees.



I bet I get away with no added resistance...


Too simple? Am I missing summat here? (Like everything you buy seems to

have
a tiny little resistor stuck in it for some reason!)


Simple is good :-)

If it was me, I'd try it and see. Worst case I reckon you might need to
add a couple of resistors if the preamp output wants to see a high
impedance load. Have a look at
http://www.users.bigpond.com/aagreen/passive01.html (just for circuit
ideas - some of the parts comments are silly),



Excellent link - thanks. (Bit on the big side, but pretty much what I had on
mind with just the one pot, though....)


or you could always ask
Mr. Pinkerton nicely if he'll share his passive attenuator circuit with
you...


If you mean the one mentioned on his webpage.....

http://www.apah69.dsl.pipex.com/stewart_p/stewart_p.htm

.....then it's a bit rich for my pockets...!!!

:-)



**On that subject, I notice no-one has had a go at my truncated'name that
tune' clip:

http://www.apah69.dsl.pipex.com/keit...aughtybits.mp3

Too obscure or just too ****ty a recording, eh?


Too obscure! Maybe Donizetti on amphetamines?




OK, I've blown it now (needed the space, thanks to Pipex' buggering
about)) - it was Orff's 'Catulli Carmina'. The words were deemed to be too
racy to be printed on the album sleeve, but can be seen on...

http://www.duzan.org/gary/catulli_carmina.html

....if you are curious!

(The original post was made in a massively crossposted thread which had
'Latin' arguments in it - I just wondered if there were any real 'Latin
scholars' in any of these groups and also whether any of the 'musos' in any
of these groups recognised the music, or had even heard of it, come to
that......)

;-)








 




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