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Iso Amp - 2 stereo - 3 mono inputs

 
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pete.howell(at)gecko-grou
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PostPosted: Wed Jan 18, 2006 5:47 am    Post subject: Iso Amp - 2 stereo - 3 mono inputs Reply with quote

Hello,

I am looking to integrate 2 stereo (Garmin 396 and Ipod) and 3
mono(EIS, Traffic, 1 extra) sources into my Flightcom
403. I have studied the design of Bob's Iso Amp and like it all
except that it only accepts one stereo input. Is there a clever way
to add another stereo input?

Also, I contacted Flightcom and they suggested (good service - 3hr
response to an e-mail) just adding 1:1 Isolation transformers (Radio
Shack 273-1374) to the mono inputs and running all lines to Pin 21 -
that way they will be unmuted.

They did not have an answer for the twin stereo inputs.

Any thoughts?

Cheers,

Pete


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nuckollsr(at)cox.net
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PostPosted: Wed Jan 18, 2006 6:30 am    Post subject: Iso Amp - 2 stereo - 3 mono inputs Reply with quote

At 07:45 AM 1/18/2006 -0600, you wrote:

Quote:

<pete.howell(at)gecko-group.com>
Hello,

I am looking to integrate 2 stereo (Garmin 396 and Ipod) and 3
mono(EIS, Traffic, 1 extra) sources into my Flightcom
403. I have studied the design of Bob's Iso Amp and like it all
except that it only accepts one stereo input. Is there a clever way
to add another stereo input?

Also, I contacted Flightcom and they suggested (good service - 3hr
response to an e-mail) just adding 1:1 Isolation transformers (Radio
Shack 273-1374) to the mono inputs and running all lines to Pin 21 -
that way they will be unmuted.

They did not have an answer for the twin stereo inputs.

Are you going to listen to both at the same time? A DPDT
switch would let you select which source was being
fed to the amplifier. Alternatively, you add second input
networks of a 150 ohm resistor, 10uF cap to pin 2 of amplifier
for each channel. Loaded of course as appropriate (R98/99).

Bob . . .


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pete.howell(at)gecko-grou
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PostPosted: Wed Jan 18, 2006 1:23 pm    Post subject: Iso Amp - 2 stereo - 3 mono inputs Reply with quote

Hi Bob - thanks for quick response - great question - I will not
listen to music from both at the same time, but the 396 has terrain
warnings I would want to hear when listening to the Ipod when the Xm
radio audio is off.

I picked up a mini DPDT on-on switch today as it is the simple/easy
way to go. I'll just turn the Ipod off over the mountains!!!

Pete

====================================================================
Are you going to listen to both at the same time? A DPDT
switch would let you select which source was being
fed to the amplifier. Alternatively, you add second input
networks of a 150 ohm resistor, 10uF cap to pin 2 of amplifier
for each channel. Loaded of course as appropriate (R98/99).

Bob . . .

=====================================================================

I am looking to integrate 2 stereo (Garmin 396 and Ipod) and 3
mono(EIS, Traffic, 1 extra) sources into my Flightcom
403. I have studied the design of Bob's Iso Amp and like it all
except that it only accepts one stereo input. Is there a clever way
to add another stereo input?

Also, I contacted Flightcom and they suggested (good service - 3hr
response to an e-mail) just adding 1:1 Isolation transformers (Radio
Shack 273-1374) to the mono inputs and running all lines to Pin 21 -
that way they will be unmuted.

They did not have an answer for the twin stereo inputs.


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gmcjetpilot(at)yahoo.com
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PostPosted: Thu Jan 19, 2006 1:58 am    Post subject: Iso Amp - 2 stereo - 3 mono inputs Reply with quote

Quote:
Is there a clever way to add another stereo input?

Don't know if it is clever, but.....

May be the kits below:

http://www.quasarelectronics.com/1010.htm
http://www.quasarelectronics.com/1071.htm
http://www.quasarelectronics.com/1050.htm


The Garmin 396 is Stereo? Cool I did not know that. Is that part of
the XM radio package? I guess I am wondering why do you need to
listen to two stereo sources at the same time, but

If you only need to listen to one at a time a simple toggle switching
between the two stereo may be the only thing that you need.

I might add that some intercoms don't do well with low gain output
from small devices like iPod's, your results may vary. There are
cool little stereo preamps electronic kits. Good Luck Pete.

Cheers George
From: "Pete Howell" <pete.howell(at)gecko-group.com>
Subject: Iso Amp - 2 stereo - 3 mono inputs


<pete.howell(at)gecko-group.com>


Hello,

I am looking to integrate 2 stereo (Garmin 396 and Ipod) and 3
mono(EIS, Traffic, 1 extra) sources into my Flightcom
403. I have studied the design of Bob's Iso Amp and like it all
except that it only accepts one stereo input. Is there a clever way
to add another stereo input?

Also, I contacted Flightcom and they suggested (good service - 3hr
response to an e-mail) just adding 1:1 Isolation transformers (Radio
Shack 273-1374) to the mono inputs and running all lines to Pin 21 -
that way they will be unmuted.

They did not have an answer for the twin stereo inputs.

Any thoughts? Cheers,Pete





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pete.howell(at)gecko-grou
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PostPosted: Fri Jan 20, 2006 5:24 pm    Post subject: Iso Amp - 2 stereo - 3 mono inputs Reply with quote

Hi Bob,

I am shamelessly copying your Iso Amp and modifying it to have 2 stereo
inputs. In the schematics, you show the input to the op amp as pin 3 on the
right channel and pin 2 on the left channel. I am not an electronics guy,
but a EE friend said this would seem this would put the channels out of
phase. This might be trick to deal with the mono inputs, could you
comment?

My daughter and I are going to draw the schematics, lay out the boards and
make the device as her science fair project. Then we will put it in the RV.

Bob - thanks for all your help.

Pete



<nuckollsr(at)cox.net>

At 07:45 AM 1/18/2006 -0600, you wrote:

Are you going to listen to both at the same time? A DPDT
switch would let you select which source was being
fed to the amplifier. Alternatively, you add second input
networks of a 150 ohm resistor, 10uF cap to pin 2 of amplifier
for each channel. Loaded of course as appropriate (R98/99).

Bob . . .


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nuckollsr(at)cox.net
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PostPosted: Sun Jan 22, 2006 7:44 am    Post subject: Iso Amp - 2 stereo - 3 mono inputs Reply with quote

At 07:23 PM 1/20/2006 -0600, you wrote:

Quote:

<pete.howell(at)gecko-group.com>

Hi Bob,

I am shamelessly copying your Iso Amp and modifying it to have 2 stereo
inputs. In the schematics, you show the input to the op amp as pin 3 on the
right channel and pin 2 on the left channel. I am not an electronics guy,
but a EE friend said this would seem this would put the channels out of
phase. This might be trick to deal with the mono inputs, could you
comment?

Your friend has a shape eye. This was brought to my attention
some months ago and a change was initiated to swap pin 2/3 on
on of the chips. I did some experiments here on the bench to
swap phase on one channel of stereo programming and couldn't
detect what I'd call a deleterious difference. My audiophile
friends at RAC suggested that a combination of right-left
isolation and/or adaptiveness of human hearing mechanisms made
it no big deal with headphones. When listening through speakers
the out-of-phase common components of sound "mix" in free
air and become more of an issue.

For this reason, I've left the current stock of boards alone.
Revision 2 has swapped the pin on one amplifier and added
spaces for the R99, R98 load resistors needed by some audio
sources.

We're debating whether to add an audio isolation amplifier
to the suite of products under development at the 'Connection.
There seems to be a lot of interest in more mono inputs, on-board
potentiometers for leveling volumes and perhaps a discrete input
for silencing the entertainment audio when cockpit duties call
for attention to aircraft audio sources.

If we did this as a product, it would probably be surface mount
parts and not suited to a DIY project. We'd probably continue
to offer the DIY -2 board as well.
Quote:
My daughter and I are going to draw the schematics, lay out the boards and
make the device as her science fair project. Then we will put it in the RV.

Good for both of you! I presume you've discovered some of the free
layout programs and associated low-cost board fabrication offers
like http://www.expresspcb.com/

I use these guys a lot.
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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