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isolation circuit

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jamesneely

Joined: 24 Mar 2009
Posts: 6

Posted: Tue Mar 24, 2009 11:17 am Post subject: isolation circuit

I have a flightline fl-760 and the manual says that both mikes go hot on transmit.  That doesn't seem a like a great idea, particularly in a noisy cockpit.  They mention an optional isolation relay board, but apparently they never did produce it, so I have to make up my own.  

The problem is that while I can solder just fine, I suck at designing circuits.  Has anyone made one of these boards, or has a schematic that I can work from?  or any source for buying such beast?

thanx,

James

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Mar 25, 2009 10:57 am Post subject: isolation circuit

At 02:17 PM 3/24/2009, you wrote:

 	  Quote: 	
		  



I have a flightline fl-760 and the manual says that both mikes go 

hot on transmit.  That doesn't seem a like a great idea, 

particularly in a noisy cockpit.  They mention an optional isolation 

relay board, but apparently they never did produce it, so I have to 

make up my own.

The problem is that while I can solder just fine, I suck at 

designing circuits.  Has anyone made one of these boards, or has a 

schematic that I can work from?  or any source for buying such beast?


	


   Are you using the hot-mic intercom feature . . . or

   is it just a comm transceiver?

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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jamesneely

Joined: 24 Mar 2009
Posts: 6

Posted: Wed Mar 25, 2009 11:47 am Post subject: Re: isolation circuit

I'm using the vox feature.  works great on the bench.  I'm not sure you can turn that feature off in this radio.

Would it work if I just put a relay in to disconnect the copilot mike on transmit..breaks the connection from the copilot mike to pin #3?  And at the same time grounds pin #7 (the transmit PTT)?



There will only be one PTT[/list]

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jamesneely

Joined: 24 Mar 2009
Posts: 6

Posted: Wed Mar 25, 2009 11:57 am Post subject: isolation circuit

I'm using the vox intercom feature.  That part seems to work great, so I'd like to use it.

James



2009/3/25 Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>

 [quote]--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> 

 

 At 02:17 PM 3/24/2009, you wrote:

  	  Quote: 	
		   --> AeroElectric-List message posted by: "jamesneely" <neelyjame(at)gmail.com (neelyjame(at)gmail.com)>

 

 I have a flightline fl-760 and the manual says that both mikes go hot on transmit.  That doesn't seem a like a great idea, particularly in a noisy cockpit.  They mention an optional isolation relay board, but apparently they never did produce it, so I have to make up my own.

  The problem is that while I can solder just fine, I suck at designing circuits.  Has anyone made one of these boards, or has a schematic that I can work from?  or any source for buying such beast?

 	
 



   Are you using the hot-mic intercom feature . . . or

   is it just a comm transceiver?

 

 

        Bob . . .

 

        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------



 

 

 

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[b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Mar 25, 2009 5:17 pm Post subject: isolation circuit

At 02:47 PM 3/25/2009, you wrote:

 	  Quote: 	
		  



I'm using the vox feature.  works great on the bench.  I'm not sure 

you can turn that feature off in this radio.

Would it work if I just put a relay in to disconnect the copilot 

mike on transmit..breaks the connection from the copilot mike to pin 

#3?  And at the same time grounds pin #7 (the transmit PTT)?



There will only be one PTT[/list]


	


   That would work. Check out

   this relay:



http://www.radioshack.com/product/index.jsp?productId 62483

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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jamesneely

Joined: 24 Mar 2009
Posts: 6

Posted: Wed Mar 25, 2009 6:57 pm Post subject: Re: isolation circuit

Thanks Bob, but I'm not having any luck with that product ID.  Which relay is it?  There's a dpdt miniature  part #275-249

James

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Mar 25, 2009 11:28 pm Post subject: isolation circuit

At 09:57 PM 3/25/2009, you wrote:

 	  Quote: 	
		  



Thanks Bob, but I'm not having any luck with that product ID.  Which 

relay is it?  There's a dpdt miniature  part #275-249

James




	


   Hmmmm . . . I guess I don't know where you are located.

   That website link was to a Radio Shack part. The relay

   is a sealed, low power 12v, dpdt device. Do you have

   access to a Radio Shack store?



   The part suggested is a Tyco part. Here's the data

   sheet:



http://relays.tycoelectronics.com/datasheets/OMI-2P.pdf



    If you don't have access to Radio Shack then any

    other small signal relay will do (2A or

    less contacts).

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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jamesneely

Joined: 24 Mar 2009
Posts: 6

Posted: Thu Mar 26, 2009 3:16 am Post subject: Re: isolation circuit

When I tried the link it didn't get me to that part, but it looks like that's the one I found one their site.  Given the info on the data sheet, I think my problem is solved.  Thanks to you, and all the others that chimed in.

We have "the Source" here in the frozen north, a subsidiary of Radio Shack.  I'll have no trouble getting what I need.



Thanx again,

James

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