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nuckolls.bob(at)aeroelect
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 Posted: Wed Apr 10, 2013 10:12 am Post subject: Diagnostic Help Please: Audio is Weak and Scratchy |
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At 10:58 AM 4/10/2013, you wrote:
| Quote: |
I think my audio problems are just about resolved. The only problem
left is when I connect the AEC amp to the intercom inputs, the sound
is loud and distorted. When I connect those outputs directly to the
aviation headset jack instead, it sounds great. Flightcom says that
they are expecting the input to be from something like an mp3
player. I'm taking the output from the AEC's pins 6 and 6. What do
I need to put in those lines to bring the AEC's output to something
similar to an mp3 player? Flightcom suggests "dual 10k audio taper"
potentiometers when connecting 8 ohm speaker inputs, but I'm not
sure if the output from the AEC is 8 ohm.
|
Sounds like the gain of the amplifier is
too high. The 150 ohm resistors shown
on each of the audio input lines are
suggested starting points. You can adjust
these for independent control of audio
level from each source.
The gain needs to be controlled at
the input to the amplifier. Adding a
potentiometer after the amplifier would
reduce the intensity of the signal but
it may well still be distorted if the
amplifier is being over driven.
How does the audio sound if you hook
a headset directly to the isolation
amplifier before it goes into the intercom?
Bob . . .
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email(at)jaredyates.com
Guest
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| Posted: Wed Apr 10, 2013 11:03 am Post subject: Diagnostic Help Please: Audio is Weak and Scratchy |
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It sounds great when I bypass the intercom.
On Apr 10, 2013, at 14:11, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: |
At 10:58 AM 4/10/2013, you wrote:
>
>
> I think my audio problems are just about resolved. The only problem left is when I connect the AEC amp to the intercom inputs, the sound is loud and distorted. When I connect those outputs directly to the aviation headset jack instead, it sounds great. Flightcom says that they are expecting the input to be from something like an mp3 player. I'm taking the output from the AEC's pins 6 and 6. What do I need to put in those lines to bring the AEC's output to something similar to an mp3 player? Flightcom suggests "dual 10k audio taper" potentiometers when connecting 8 ohm speaker inputs, but I'm not sure if the output from the AEC is 8 ohm.
Sounds like the gain of the amplifier is
too high. The 150 ohm resistors shown
on each of the audio input lines are
suggested starting points. You can adjust
these for independent control of audio
level from each source.
The gain needs to be controlled at
the input to the amplifier. Adding a
potentiometer after the amplifier would
reduce the intensity of the signal but
it may well still be distorted if the
amplifier is being over driven.
How does the audio sound if you hook
a headset directly to the isolation
amplifier before it goes into the intercom?
Bob . . .
|
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http://www.matronics.com/Navigator?AeroElectric-List |
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email(at)jaredyates.com
Guest
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| Posted: Wed Apr 10, 2013 11:15 am Post subject: Diagnostic Help Please: Audio is Weak and Scratchy |
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Also, I just found that the amp ics are getting very hot.
On Apr 10, 2013, at 14:11, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: |
At 10:58 AM 4/10/2013, you wrote:
>
>
> I think my audio problems are just about resolved. The only problem left is when I connect the AEC amp to the intercom inputs, the sound is loud and distorted. When I connect those outputs directly to the aviation headset jack instead, it sounds great. Flightcom says that they are expecting the input to be from something like an mp3 player. I'm taking the output from the AEC's pins 6 and 6. What do I need to put in those lines to bring the AEC's output to something similar to an mp3 player? Flightcom suggests "dual 10k audio taper" potentiometers when connecting 8 ohm speaker inputs, but I'm not sure if the output from the AEC is 8 ohm.
Sounds like the gain of the amplifier is
too high. The 150 ohm resistors shown
on each of the audio input lines are
suggested starting points. You can adjust
these for independent control of audio
level from each source.
The gain needs to be controlled at
the input to the amplifier. Adding a
potentiometer after the amplifier would
reduce the intensity of the signal but
it may well still be distorted if the
amplifier is being over driven.
How does the audio sound if you hook
a headset directly to the isolation
amplifier before it goes into the intercom?
Bob . . .
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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email(at)jaredyates.com
Guest
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| Posted: Wed Apr 10, 2013 11:23 am Post subject: Diagnostic Help Please: Audio is Weak and Scratchy |
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I think I might have found one problem with some incorrect resistors on the 317.
On Apr 10, 2013, at 14:11, "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: |
At 10:58 AM 4/10/2013, you wrote:
>
>
> I think my audio problems are just about resolved. The only problem left is when I connect the AEC amp to the intercom inputs, the sound is loud and distorted. When I connect those outputs directly to the aviation headset jack instead, it sounds great. Flightcom says that they are expecting the input to be from something like an mp3 player. I'm taking the output from the AEC's pins 6 and 6. What do I need to put in those lines to bring the AEC's output to something similar to an mp3 player? Flightcom suggests "dual 10k audio taper" potentiometers when connecting 8 ohm speaker inputs, but I'm not sure if the output from the AEC is 8 ohm.
Sounds like the gain of the amplifier is
too high. The 150 ohm resistors shown
on each of the audio input lines are
suggested starting points. You can adjust
these for independent control of audio
level from each source.
The gain needs to be controlled at
the input to the amplifier. Adding a
potentiometer after the amplifier would
reduce the intensity of the signal but
it may well still be distorted if the
amplifier is being over driven.
How does the audio sound if you hook
a headset directly to the isolation
amplifier before it goes into the intercom?
Bob . . .
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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