----------------------------------------------------------
                           AeroElectric-List Digest Archive
                                      ---
                     Total Messages Posted Tue 03/10/20: 4
           ----------------------------------------------------------
 
 
Today's Message Index:
----------------------
 
     1. 04:43 AM - Re: Re: OV protection circuit design  (Robert L. Nuckolls, III)
     2. 10:42 AM - Two Radios to One Intercom  (Sebastien)
     3. 11:48 AM - Re: Two Radios to One Intercom  (Charlie England)
     4. 12:22 PM - Re: Two Radios to One Intercom  (user9253)
 
 
 
________________________________  Message 1  _____________________________________


Time: 04:43:41 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: Re: OV protection circuit design

At 11:10 AM 3/9/2020, you wrote:
>Bob,
>
>At what fuse rating does the breaker pop before the fuse?  30A, 40A, 
>50A... ???
>
>Just curious...

  No hard and fast rule . . . both breakers and
  fuses can be had in a range of trip profiles.
  I've tested the ATO/ATC30 plastic fuses
  against the miniature breakers popular in
  aircraft with a goal of at least 3x head-room
  with a 100A crowbar event.

  I couldn't find my favorite 300A HE sensor
  but did find a 400A that will let me repeat
  the bench tests but I'll take a look at the
  ATO40 fuse also.


   Bob . . . 

________________________________  Message 2  _____________________________________


Time: 10:42:34 AM PST US
From: Sebastien <cluros@gmail.com>
Subject: AeroElectric-List: Two Radios to One Intercom

Hello All,

I have been searching through the list archives as I'm sure we
have discussed this before but cannot find the exact answer. We currently
have a single VHF radio going to an intercom and would like to add a second
radio. Input to the intercom would be controlled by the volume knobs on the
radios and output will be controlled by a transmit select switch which will
only allow the ptt line to be triggered on one radio at a time.

What is required to combine the audio output of the two radios to a single
audio input on the intercom?

Thank you,

Sebastien

________________________________  Message 3  _____________________________________


Time: 11:48:28 AM PST US
Subject: Re: AeroElectric-List: Two Radios to One Intercom
From: Charlie England <ceengland7@gmail.com>

Simplest way is a ~500 ohm resister in series with each radio's output, and
 tying the downstream ends together to feed the intercom radio input=2E

Ch
arlie

=81=A3Sent from BlueMail =8B

On Mar 10, 2020, 12:48 PM, at
 12:48 PM, Sebastien <cluros@gmail=2Ecom> wrote:
>Hello All,
>
>I have been
 searching through the list archives as I'm sure we
>have discussed this be
fore but cannot find the exact answer=2E We
>currently
>have a single VHF r
adio going to an intercom and would like to add a
>second
>radio=2E Input t
o the intercom would be controlled by the volume knobs on
>the
>radios and 
output will be controlled by a transmit select switch which
>will
>only all
ow the ptt line to be triggered on one radio at a time=2E
>
>What is requir
ed to combine the audio output of the two radios to a
>single
>audio input 
on the intercom?
>
>Thank you,
>
>Sebastien

________________________________  Message 4  _____________________________________


Time: 12:22:58 PM PST US
Subject: AeroElectric-List: Re: Two Radios to One Intercom
From: "user9253" <fransew@gmail.com>


Found this drawing someplace.

--------
Joe Gores


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=495222#495222


Attachments: 

http://forums.matronics.com//files/audio_combine_160.jpg


 

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