----------------------------------------------------------
                           Avionics-List Digest Archive
                                      ---
                     Total Messages Posted Wed 01/09/08: 3
           ----------------------------------------------------------
 
 
Today's Message Index:
----------------------
 
     1. 09:00 AM - Audio panel #inputs vs #sources  (Ralph E. Capen)
     2. 10:59 AM - Strobe discharge pop-pop-pop  (Ralph E. Capen)
     3. 08:26 PM - Re: Audio panel #inputs vs #sources  (Charles Reiche)
 
 
 
________________________________  Message 1  _____________________________________


Time: 09:00:47 AM PST US
From: "Ralph E. Capen" <recapen@earthlink.net>
Subject: Avionics-List: Audio panel #inputs vs #sources


Folks,

I have three inputs that should be 'unswitched':
AOA warning
Traffic Alert
AF3400EM Engine monitor

My audio panel (PS Engineering PMA7000MS) has two unswitched inputs.
Can I tie two of the sources to one input?  I think there would only be an issue
if they both went off at teh same time.
Alternatively, I can put the third to a switched input and leave the switch on.

Thanks,
Ralph


________________________________  Message 2  _____________________________________


Time: 10:59:40 AM PST US
From: "Ralph E. Capen" <recapen@earthlink.net>
Subject: Avionics-List: Strobe discharge pop-pop-pop


I'm doing some system testing and I can hear a very slight pop each time my strobes
discharge through my headset.  It doesn't break the squelch or prevent me
from hearing the radios - or stereo for that matter.  No whining on the charge
cycles and I gotta listen carefully to catch the pop - but it's there.

Is this strictly due to the high-voltage discharge in a 12V system?  Is there something
I can due to get rid of this?  Or should I take gladness that it's faint,
doesn't interfere, it's as good as it gets, have a coke and a smile and.......?

Ralph


________________________________  Message 3  _____________________________________


Time: 08:26:34 PM PST US
From: "Charles Reiche" <reichec@verizon.net>
Subject: Re: Avionics-List: Audio panel #inputs vs #sources


Put a 510 ohm resistor inline with each input before it gets to the back of 
the audio panel on the ones you will be paralelling together.


device 1 - 510 ohm- \
                                  -------unswitched input
device 2 - 510 ohm- /


the resistors protect the other device's audio amp.

Good luck

Charles

----- Original Message ----- 
From: "Ralph E. Capen" <recapen@earthlink.net>
<aeroelectric-list@matronics.com>
Sent: Wednesday, January 09, 2008 11:16 AM
Subject: Avionics-List: Audio panel #inputs vs #sources


> <recapen@earthlink.net>
>
> Folks,
>
> I have three inputs that should be 'unswitched':
> AOA warning
> Traffic Alert
> AF3400EM Engine monitor
>
> My audio panel (PS Engineering PMA7000MS) has two unswitched inputs.
> Can I tie two of the sources to one input?  I think there would only be an 
> issue if they both went off at teh same time.
> Alternatively, I can put the third to a switched input and leave the 
> switch on.
>
> Thanks,
> Ralph
>
>
> 


 

-------------------------------------------------------------------------------------
                       Other Matronics Email List Services
-------------------------------------------------------------------------------------
Post A New Message               avionics-list@matronics.com
UN/SUBSCRIBE                     http://www.matronics.com/subscription
List FAQ                         http://www.matronics.com/FAQ/Avionics-List.htm
Web Forum Interface To Lists     http://forums.matronics.com
Matronics List Wiki              http://wiki.matronics.com
Full Archive Search Engine       http://www.matronics.com/search
7-Day List Browse                http://www.matronics.com/browse/avionics-list
Browse Digests                   http://www.matronics.com/digest/avionics-list
Browse Other Lists               http://www.matronics.com/browse
Live Online Chat!                http://www.matronics.com/chat
Archive Downloading              http://www.matronics.com/archives
Photo Share                      http://www.matronics.com/photoshare
Other Email Lists                http://www.matronics.com/emaillists
Contributions                    http://www.matronics.com/contribution
-------------------------------------------------------------------------------------

These Email List Services are sponsored solely by Matronics and through the 
generous Contributions of its members.