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mchamberlain@runbox.com
Joined: 10 Jul 2006
Posts: 8
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 Posted: Sun Dec 24, 2006 4:44 am Post subject: Daisy-Chaining Stereo Inputs |
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Hi All and Happy Christmas!
I am trying to get stereo input from multiple sources (MP3, GPS, Traffic etc.) in to my FlightCom 403 intercom. I figured it might work by just "daisy-chaining" them together but if I have more than one plugged it at once I get some sort of nasty feedback. Is there some sort of device I need in between them so they can't "see" each other?
Thanks for your help,
Mark - N234C
Flying - 48 hours
[quote][b]
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Rv-7 (234C Res)
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nuckollsr(at)cox.net
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| Posted: Sun Dec 24, 2006 9:39 am Post subject: Daisy-Chaining Stereo Inputs |
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At 05:41 AM 12/24/2006 -0700, you wrote:
| Quote: | Hi All and Happy Christmas!
I am trying to get stereo input from multiple sources (MP3, GPS, Traffic
etc.) in to my FlightCom 403 intercom. I figured it might work by just
"daisy-chaining" them together but if I have more than one plugged it at
once I get some sort of nasty feedback. Is there some sort of device I
need in between them so they can't "see" each other?
Thanks for your help,
|
The problem is not so much one of "feedback" as it is
for "loading". Each source, while not supplying energy
to the signal stream presents a potential for being a load.
this means that while one source is being used, it sees multiple
loads that may affect both signal intensity and frequency
response. MUCH better that you use an isolation (mixing) amplifier
if you want to use multiple sources simultaneously or a simple
two-pole, three-position switch (like miniature 4-pole, on-on-on
switch) for selecting each source one at a time.
However, you won't damage anything with the daisy chaining
experiment. Give it a try. It might prove satisfactory to your
needs . . . it's just not the best we know how to do.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
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nuckollsr(at)cox.net
Guest
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| Posted: Sun Dec 24, 2006 12:01 pm Post subject: Daisy-Chaining Stereo Inputs |
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| Quote: | >
>I am trying to get stereo input from multiple sources (MP3, GPS, Traffic
>etc.) in to my FlightCom 403 intercom. I figured it might work by just
>"daisy-chaining" them together but if I have more than one plugged it at
>once I get some sort of nasty feedback. Is there some sort of device I
>need in between them so they can't "see" each other?
>
>Thanks for your help,
The problem is not so much one of "feedback" as it is
for "loading". Each source, while not supplying energy
to the signal stream presents a potential for being a load.
this means that while one source is being used, it sees multiple
loads that may affect both signal intensity and frequency
response. MUCH better that you use an isolation (mixing) amplifier
if you want to use multiple sources simultaneously or a simple
two-pole, three-position switch (like miniature 4-pole, on-on-on
switch) for selecting each source one at a time.
However, you won't damage anything with the daisy chaining
experiment. Give it a try. It might prove satisfactory to your
needs . . . it's just not the best we know how to do.
|
I forgot to add. There's a brief discussion of multiple source
audio mixing in the current update chapter to the 'Connection
which you're free to download at:
http://aeroelectric.com/articles/Rev11/18Audio_R11.pdf
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
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ceengland(at)bellsouth.ne
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| Posted: Sun Dec 24, 2006 1:38 pm Post subject: Daisy-Chaining Stereo Inputs |
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| Quote: |
From: "Robert L. Nuckolls, III" <nuckollsr(at)cox.net>
Date: 2006/12/24 Sun AM 11:37:39 CST
To: aeroelectric-list(at)matronics.com
Subject: Re: Daisy-Chaining Stereo Inputs
At 05:41 AM 12/24/2006 -0700, you wrote:
>Hi All and Happy Christmas!
>
>I am trying to get stereo input from multiple sources (MP3, GPS, Traffic
>etc.) in to my FlightCom 403 intercom. I figured it might work by just
>"daisy-chaining" them together but if I have more than one plugged it at
>once I get some sort of nasty feedback. Is there some sort of device I
>need in between them so they can't "see" each other?
>
>Thanks for your help,
The problem is not so much one of "feedback" as it is
for "loading". Each source, while not supplying energy
to the signal stream presents a potential for being a load.
this means that while one source is being used, it sees multiple
loads that may affect both signal intensity and frequency
response. MUCH better that you use an isolation (mixing) amplifier
if you want to use multiple sources simultaneously or a simple
two-pole, three-position switch (like miniature 4-pole, on-on-on
switch) for selecting each source one at a time.
However, you won't damage anything with the daisy chaining
experiment. Give it a try. It might prove satisfactory to your
needs . . . it's just not the best we know how to do.
Bob . . .
It might be worthwhile to ask what he means by 'daisychaining'. The most common meaning in my world is plugging one device into the next, then that device into the next, etc. If he's doing that, there might easily be 'feedback' issues depending on how each device handles 'ins' & 'outs'.
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Charlie
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