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'[OT]: Audio Analog Multiplexer Needed'
2001\08\08@142715 by James Paul

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All,

I need a way of multiplexing audio signals preferrably without using
relays.  I would prefer a solid state solution.

I'll have 12-15 single ended inputs that I need to be able to put
on either of two single ended output busses.  (For stereo, I'll
just make two).

I need to be able to select one or several inputs simultaneously
and have them all go to the selected output bus.  For instance,
lets say I want to use inputs 3, 6, 7, 8, and 12.  I'd like to
be able to send inputs 3, 8, and 12 to output bus 1, and inputs
6, and 7 to output bus 2. The input voltage(s) will range from
about 100mv to about 2 volts (P-P).  The voltage output from the
mux can be lower, but must be a faithful reproduction of the
analog input signal.

I thought of using analog mux's (ie 4051, 4052, etc), but wondered
if anyone has any ideas other than that?  If you do and can share
it, I would appreciate hearing from you.  This is for a contracted
audio project, so I can't divulge much more info at this time.

But any help would be greatly appreciated here.

                                           Thanks and Regards,

                                                  Jim

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2001\08\08@144751 by Dale Botkin

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Have you thought about diode switching?  I've seen that used a LOT in ham
gear, sounds like it might work for you.  You may need to use AC-coupled
inputs...

Dale

On Wed, 8 Aug 2001, James Paul wrote:

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2001\08\08@150006 by Spehro Pefhany

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At 01:57 PM 8/8/01 -0500, you wrote:
>Have you thought about diode switching?  I've seen that used a LOT in ham
>gear, sounds like it might work for you.  You may need to use AC-coupled
>inputs...

There are some nice crosspoint switches available, low distortion etc.

Try Mitel.

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2001\08\08@153446 by Chris Carr

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Analog Devices. Type SSM in the Part Number Search. There are several
devices that may be what you are looking for.
http://www.analog.com/

Regards

Chris Carr

{Original Message removed}

2001\08\08@164456 by Tobie Horswill

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Try this :

www.analog.com/publications/magazines/Dialogue/archives/30-1/8channel
.html

8x2 audio mixer in a chip, can be daisy chained for more inputs.

It uses SPI to control the levels if I recall.I once used the SSM2160 for an
audio spatializer project (had a PIC in it also!) and it worked great once I
got rid of the noise from the PIC's clock  ...

hope this helps,
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{Original Message removed}

2001\08\08@192539 by Harold M Hallikainen

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       I wouldn't use a 4051 for quality audio. Might have a look at Maxim.
However, it is really hard to beat the performance of a reed relay!

Harold


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2001\08\09@021619 by Vasile Surducan

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On Wed, 8 Aug 2001, Harold M Hallikainen wrote:

>         I wouldn't use a 4051 for quality audio. Might have a look at Maxim.
> However, it is really hard to beat the performance of a reed relay!
>

 4051 to 4053 or 4016/4066 could be used very well in high performance
audio applications. Of course Maxim's too.
Vasile

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2001\08\10@051513 by Peter L. Peres

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>  4051 to 4053 or 4016/4066 could be used very well in high performance
>audio applications. Of course Maxim's too.
>Vasile

Unless you switch line level imho think twice. High performance audio
nowadays implies dynamic range >90dB at least and these chips have enough
coupling from the digital to the analog ports to cause clicks and computer
'music' to leak through. Not to mention power supply rejection which is
also not 90dBish.

Peter

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2001\08\10@054734 by Vasile Surducan

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On Fri, 10 Aug 2001, Peter L. Peres wrote:

> >  4051 to 4053 or 4016/4066 could be used very well in high performance
> >audio applications. Of course Maxim's too.
> >Vasile
>
> Unless you switch line level imho think twice. High performance audio
> nowadays implies dynamic range >90dB at least and these chips have enough
> coupling from the digital to the analog ports to cause clicks and computer
> 'music' to leak through. Not to mention power supply rejection which is
> also not 90dBish.
>
 Absolutely agree !
 Vasile

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