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Stereo to Mono

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Don McIntosh

Joined: 02 Jul 2007
Posts: 24
Location: Sandpoint, Idaho

Posted: Fri May 29, 2009 9:58 am Post subject: Stereo to Mono

I want to install a plug in my panel to plug my stereo Walkman into but my intercom (PM1000 II) is mono. Can I just splice the Right and Left leads together to go into the intercom? Also the intercom pins are labeled "HI" and "LOW". Is this just the pin identification numbers?

_________________
Don McIntosh
Kitfox Series 7
Jabiru 3300

nuckolls.bob(at)aeroelect
Guest

Posted: Fri May 29, 2009 10:34 am Post subject: Stereo to Mono

At 12:58 PM 5/29/2009, you wrote:

 	  Quote: 	
		  

<don(at)contractorsnorthwest.com>



I want to install a plug in my panel to plug my stereo Walkman into 

but my intercom (PM1000 II) is mono. Can I just splice the Right and 

Left leads together to go into the intercom? Also the intercom pins 

are labeled "HI" and "LOW". Is this just the pin identification numbers?


	


   Put a 100 ohm, 1/4w resistor in series with the two

   stereo output before bringing them together at the

   "HI" input terminal. The "LOW" terminal is ground.

        Bob . . .



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

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

Don McIntosh

Joined: 02 Jul 2007
Posts: 24
Location: Sandpoint, Idaho

Posted: Fri May 29, 2009 2:08 pm Post subject: Re: Stereo to Mono

Bob,

Thanks for the answer. OK, so behind the panel, where do you mount these resistors, or are they just soldered in-line with heat shrink over them?BTW I am in process of reading your book.

_________________
Don McIntosh
Kitfox Series 7
Jabiru 3300

nuckolls.bob(at)aeroelect
Guest

Posted: Fri May 29, 2009 2:56 pm Post subject: Stereo to Mono

At 05:08 PM 5/29/2009, you wrote:

 	  Quote: 	
		  

<don(at)contractorsnorthwest.com>



Bob,

Thanks for the answer. OK, so behind the panel, where do you mount 

these resistors, or are they just soldered in-line with heat shrink over them?


	


     Given the relatively low priority for

     comfortable terminaion of flight, I think

     I'd build them into the wire bundle and

     heat shrink 'em. See:



http://aeroelectric.com/articles/Homeless/Homeless_Components.htm

 	  Quote: 	
		  BTW I am in process of reading your book.


	


     Great! If you have any questions, post them

     here on the List.

        Bob . . .



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

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

raymondj(at)frontiernet.n
Guest

Posted: Fri May 29, 2009 3:25 pm Post subject: Stereo to Mono

Bob,



	Just a quick question.  It the resistor to lower the voltage at the 

intercom or is it related to what the CD player output sees?  Or 

something completely different.  If it is to lower the voltage, should 

the voltage be in the same range as the other inputs to the intercom?



Thanks,

Raymond Julian

Kettle River, MN.

"Hope for the best, but plan for the worst"



do not archive



Robert L. Nuckolls, III wrote:

 	  Quote: 	
		   

 <nuckolls.bob(at)aeroelectric.com>

 

 At 12:58 PM 5/29/2009, you wrote:

> 

> <don(at)contractorsnorthwest.com>

>

> I want to install a plug in my panel to plug my stereo Walkman into 

> but my intercom (PM1000 II) is mono. Can I just splice the Right and 

> Left leads together to go into the intercom? Also the intercom pins 

> are labeled "HI" and "LOW". Is this just the pin identification numbers?

 

   Put a 100 ohm, 1/4w resistor in series with the two

   stereo output before bringing them together at the

   "HI" input terminal. The "LOW" terminal is ground.

 

 

        Bob . . .

 

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

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

nuckolls.bob(at)aeroelect
Guest

Posted: Fri May 29, 2009 7:19 pm Post subject: Stereo to Mono

At 06:24 PM 5/29/2009, you wrote:

 	  Quote: 	
		  



Bob,



         Just a quick question.  It the resistor to lower the 

 voltage at the intercom or is it related to what the CD player 

 output sees?  Or something completely different.  If it is to lower 

 the voltage, should the voltage be in the same range as the other 

 inputs to the intercom?


	


   The resistors are a crude "audio mixer" that

   gives you a mono-average of right and

   left channels. It also isolates the right

   and left audio amplifiers from each other so

   that diverse audio signal levels in the

   two channels don't cause the two amplifiers

   to arm-wrestle.



   The resistors can be lower . . . say the

   same as for MP3 player headphones . . .

   33 ohms. But you probably won't hear much

   loss of signal that cannot be compensated

   for by turning up the volume on the audio

   device.





        Bob . . .



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

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

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

bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Sat May 30, 2009 4:20 am Post subject: Stereo to Mono

5/30/2009



Hello Don, You wrote: "I want to install a plug in my panel to plug my 

stereo Walkman into but my intercom (PM1000 II) is mono."



Here is one way to solve that problem --



http://www.radioshack.com/product/index.jsp?productId 102669



This adapter will put the output of a mono jack on your panel into both 

sides of your stereo Walkman.



Also take a look at some of the other adapters available. You may want to 

put a normal airplane earphone sized jack on your instrument panel so that 

either your Walkman (with an adapter) or an airplane earphone set (without 

adapter) may be plugged in.



'OC' Says: "The best investment we can make is the effort to gather and 

understand knowledge."



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

Subject: Stereo to Mono

From: "Don McIntosh" <don(at)contractorsnorthwest.com>

I want to install a plug in my panel to plug my stereo Walkman into but my 

intercom

(PM1000 II) is mono. Can I just splice the Right and Left leads together

to go into the intercom? Also the intercom pins are labeled "HI" and "LOW". 

Is

this just the pin identification numbers?



--------

Don McIntosh

Kitfox Series 7 under construction

Jabiru 3300

gmcjetpilot

Joined: 04 Nov 2006
Posts: 170

Posted: Mon Jun 01, 2009 2:07 am Post subject: Stereo to Mono

I would not use a stereo to mono jack to go FROM stereo to MONO. It really is made 

for going from mono to drive a stereo headphone, split to drive both L & R channels. 

 It is not designed to combine stereo to mono.

 Whats the big deal? Shorting L & R of an amp can cause damage, even an iPod. If the 

"Walkman" has a mono switch than its OK, but iPods do not have mono switches.

 If you don't have a MP3 player (iPod) get one. Walkman are last decades news. If you 

don't have an iPod you can get 100's of hours of music on them with play time of 6 hours 

per charge. They are also small and light weight.

 There are some threads on how to properly combine stereo and ground issues in this 

forum. Just use the search engine. The easy way is with capacitor and resistor, which 

you can wire behind the panel. You would use a stereo 1/8" phone jack and then 

go from stereo to mono with the isolation Cap and Resistor.

 Cheers George

 >From: <bakerocb(at)cox.net (bakerocb(at)cox.net)>

 	  Quote: 	
		  Subject: Stereo to Mono

 >

 	  Quote: 	
		  5/30/2009

 >Hello Don, You wrote: "I want to install a plug in my panel to plug my 

 	  Quote: 	
		  stereo Walkman into but my intercom (PM1000 II) is mono."

 >Here is one way to solve that problem --

 >http://www.radioshack.com/product/index.jsp?productId=2102669

 >This adapter will put the output of a mono jack on your panel into both 

 	  Quote: 	
		  sides of your stereo Walkman.

 >Also take a look at some of the other adapters available. You may want to 

 	  Quote: 	
		  put a normal airplane earphone sized jack on your instrument panel so that 

either your Walkman (with an adapter) or an airplane earphone set (without 

adapter) may be plugged in.

 >

 >============================

 >>

 	  Quote: 	
		  >Subject: Stereo to Mono

>From: "Don McIntosh" <don(at)contractorsnorthwest.com (don(at)contractorsnorthwest.com)>

 >>

 	  Quote: 	
		  >I want to install a plug in my panel to plug my stereo Walkman into but my 

>intercom (PM1000 II) is mono. Can I just splice the Right and Left leads together

>to go into the intercom? Also the intercom pins are labeled "HI" and "LOW". 

>Is this just the pin identification numbers?

 >>--------

 	  Quote: 	
		  >Don McIntosh

>Kitfox Series 7 under construction

>Jabiru 3300 

            [quote][b]

jd(at)lawsonimaging.ca
Guest

Posted: Thu Jun 04, 2009 3:42 am Post subject: Stereo to Mono

bakerocb(at)cox.net wrote:

 	  Quote: 	
		   

 

 5/30/2009

 

 Hello Don, You wrote: "I want to install a plug in my panel to plug my 

 stereo Walkman into but my intercom (PM1000 II) is mono."

 

 Here is one way to solve that problem --

 

 http://www.radioshack.com/product/index.jsp?productId 102669

 

 This adapter will put the output of a mono jack on your panel into both 

 sides of your stereo Walkman.

 


	


Greetings... I'm a bit confused on this subject after reading this thread and 

similar threads in other lists. I have the same objective: plug my iPod into my 

Xcom 760's audio in. The Xcom's documentation says to use a 3.5mm mono jack in 

combination with a stereo-to-mono adapter plug. My thought was to eliminate the 

adapter plug by simply jumping the left/right channel pins on the jack itself, 

and this does indeed give [seemingly] good results with both channels clearly 

heard. But lately I've read that this may damage the iPod, and I should be using 

resistors/capacitors and/or the adaptor, as though the adaptor had some 

components built into it's small, moulded little case. I'm relatively sure that 

this adaptor plug is doing nothing but physically joining the left and right 

channels from the stereo plug into a single tip on the mono plug, and is in no 

way electronically 'magic'.



Not wanting to damage my iPod, I'd be interested to know the science behind all 

the posts saying 'don't do it' (wire the left and right together), use the 

adaptor plug. Thanks!

-- 

Regards,  J.

Sonex C-FJNJ



+-------------------------------------------------------------+

|  J. Davis, M.Sc.            | (computer science)            |

| *NIX consulting, SysAdmin   | email: jd at lawsonimaging.ca |

+-------------------------------------------------------------+



and now... Deep Thought #39, by Jack Handy



Probably the earliest flyswatters were nothing more than some sort of

striking surface attached to the end of a long stick.

chris_hand(at)comcast.net
Guest

Posted: Thu Jun 04, 2009 9:44 pm Post subject: Stereo to Mono

<If you don't have a MP3 player (iPod) get one. Walkman are last decades  news. If you 

<don't have an iPod you can get 100's of hours of music on  them with play time of 6 hours 

<per charge. They are also small and light  weight.>

  

  

 Actually, I use a Sony Walkman in my RV-6A that has something on the order  of 400+ songs right now with plenty of storage room to spare for more songs,  videos, photos, etc.  Weighs a few ounces, plugs into my intercom, didn't  cost much, and works great.  It's a Sony Walkman digital media player  - smaller physical size than the i-pods my kids prefer and does all I want  for the RV.  Although once upon a time I did have one of the Walkman units  you are talking about, Sony has rehashed the name with current  technology.....not sure which era Don's Walkman is from.

  

 Chris

  



 [quote]   ---

harley(at)AgelessWings.co
Guest

Posted: Fri Jun 05, 2009 5:18 am Post subject: Stereo to Mono

>>Sony Walkman in my RV-6A that has something on the order of 400+ songs right now with plenty of storage room to spare for more songs, videos, photos, etc.<<

 You mean those tapes I use in my Walkman have been replaced by something better? <VBG>

 Actually I am very happy with the HP pocket computer that came with my newest upgrade to Anywhere Map.  It fits in my pocket when not in it's vehicle mount, it has wireless internet (I did replace the Microsoft browser with "Opera", however), MP3 player, Bluetooth, built in GPS antenna, Tom-Tom for ground navigation, and, of course, AnywhereMap. Not to mention the games that I loaded into it that I can play while waiting in the doctor's waiting rooms! <G>

 It does have an output socket for earphones and I have an adapter for the 1/8" socket to a 1/4" plug to just plug in to the appropriate socket in my intercom.  But haven't gotten around to connecting it to my intercom yet, since I don't even have an electrical system in my plane yet!  Hopefully before this year is out....

 Harley

 Chris Hand wrote: [quote]               <If you don't have a MP3 player (iPod) get one. Walkman are last decades news. If you 

 <don't have an iPod you can get 100's of hours of music on them with play time of 6 hours 

 <per charge. They are also small and light weight.>

   Actually, I use a Sony Walkman in my RV-6A that has something on the order of 400+ songs right now with plenty of storage room to spare for more songs, videos, photos, etc.  Weighs a few ounces, plugs into my intercom, didn't cost much, and works great.  It's a Sony Walkman digital media player - smaller physical size than the i-pods my kids prefer and does all I want for the RV.  Although once upon a time I did have one of the Walkman units you are talking about, Sony has rehashed the name with current technology.....not sure which era Don's Walkman is from.

   Chris

    	  Quote: 	
		       ----- Original Message ----- 

     From:     gmcjetpilot(at)yahoo.com (gmcjetpilot(at)yahoo.com) 

     To:     aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com) ; don(at)contractorsnorthwest.com (don(at)contractorsnorthwest.com)     

     Sent: Monday, June 01, 2009 3:00 AM

     Subject: Re: Stereo to Mono

                                           I would not use a stereo to mono jack to go FROM stereo to MONO. It really is made 

 for going from mono to drive a stereo headphone, split to drive both L & R channels. 

           It is not designed to combine stereo to mono.

           Whats the big deal? Shorting L & R of an amp can cause damage, even an iPod. If the 

 "Walkman" has a mono switch than its OK, but iPods do not have mono switches.

           If you don't have a MP3 player (iPod) get one. Walkman are last decades news. If you 

 don't have an iPod you can get 100's of hours of music on them with play time of 6 hours 

 per charge. They are also small and light weight.

           There are some threads on how to properly combine stereo and ground issues in this 

 forum. Just use the search engine. The easy way is with capacitor and resistor, which 

 you can wire behind the panel. You would use a stereo 1/8" phone jack and then 

 go from stereo to mono with the isolation Cap and Resistor.

           Cheers George

           >From: <bakerocb(at)cox.net (bakerocb(at)cox.net)>

 >Subject: Stereo to Mono

           >

 >5/30/2009

           >Hello Don, You wrote: "I want to install a plug in my panel to plug my 

 >stereo Walkman into but my intercom (PM1000 II) is mono."

           >Here is one way to solve that problem --

           >[url=http://www.radioshack.com/product/index.jsp?productId 102669]http://www.radioshack.com/product/index.jsp?productId 102669[/url]

           >This adapter will put the output of a mono jack on your panel into both 

 >sides of your stereo Walkman.

           >Also take a look at some of the other adapters available. You may want to 

 >put a normal airplane earphone sized jack on your instrument panel so that 

 >either your Walkman (with an adapter) or an airplane earphone set (without 

 >adapter) may be plugged in.

           >

           >============================

           >>

 >>Subject: Stereo to Mono

 >>From: "Don McIntosh" <don(at)contractorsnorthwest.com (don(at)contractorsnorthwest.com)>

           >>

 >>I want to install a plug in my panel to plug my stereo Walkman into but my 

 >>intercom (PM1000 II) is mono. Can I just splice the Right and Left leads together

 >>to go into the intercom? Also the intercom pins are labeled "HI" and "LOW". 

 >>Is this just the pin identification numbers?

           >>--------

 >>Don McIntosh

 >>Kitfox Series 7 under construction

 >>Jabiru 3300 

      	  Quote: 	

href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List

href="http://forums.matronics.com">http://forums.matronics.com

href="http://www.matronics.com/contribution">http://www.matronics.com/c

 href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List

 href="http://forums.matronics.com">http://forums.matronics.com

 href="http://www.matronics.com/contribution">http://www.matronics.com/contribution

 [b]

rcole927(at)earthlink.net
Guest

Posted: Sat Jun 06, 2009 9:27 am Post subject: Stereo to Mono

Does anyone know if the 1/8-inch phone jack audio output on a Garmin 396 is stereo or monaural?  I plan to route this output into the monaural input of the intercom.  If the Garmin output is stereo, I can do the two-resistor mixer that was mentioned previously in this thread.

 Roger Cole

1946 Cessna 140, flying

Murphy Elite #709, working on fuselage

rcole927(at)earthlink.net (rcole927(at)earthlink.net)



 



On Jun 5, 2009, at 12:40 AM, Chris Hand wrote:

[quote]<If you don't have a MP3 player (iPod) get one. Walkman are last decades news. If you 

<don't have an iPod you can get 100's of hours of music on them with play time of 6 hours 

<per charge. They are also small and light weight.>

 

 

Actually, I use a Sony Walkman in my RV-6A that has something on the order of 400+ songs right now with plenty of storage room to spare for more songs, videos, photos, etc.  Weighs a few ounces, plugs into my intercom, didn't cost much, and works great.  It's a Sony Walkman digital media player - smaller physical size than the i-pods my kids prefer and does all I want for the RV.  Although once upon a time I did have one of the Walkman units you are talking about, Sony has rehashed the name with current technology.....not sure which era Don's Walkman is from.

 

Chris

 



[quote]---

JohnInReno

Joined: 08 Sep 2007
Posts: 150

Posted: Sat Jun 06, 2009 12:05 pm Post subject: Stereo to Mono

I think I have a similar problem in a spam can. There is a 1/8 plug coming out of the intercom that I can plug into a Garmin 496. The results are audible but poor. XM radio is barely audible but verbal warnings from the 496 are much clearer. Could it be that I need a 1/8 mono to stereo adapter or is additional wiring required?

 

 Can I measure the resistance of the adapter to determine if it contains more than a solid connection?

 

 John Morgensen

 

 Roger Cole wrote: [quote] Does anyone know if the 1/8-inch phone jack audio output on a Garmin 396 is stereo or monaural?  I plan to route this output into the monaural input of the intercom.  If the Garmin output is stereo, I can do the two-resistor mixer that was mentioned previously in this thread.   

       Roger Cole

   1946 Cessna 140, flying

   Murphy Elite #709, working on fuselage

   rcole927(at)earthlink.net (rcole927(at)earthlink.net)

      

   

   

 [b]

_________________
John Morgensen
RV-9A - Born on July 3, 2013
RV4 - for sale

mprather(at)spro.net
Guest

Posted: Sat Jun 06, 2009 7:51 pm Post subject: Stereo to Mono

The Garmin 396 owner's manual makes reference to connecting stereo

headphones to the audio jack on the 396 (p114).  I plug my 396 into my car

stereo's aux port all the time.  I'm pretty sure I get stereo signals from

it.

Regards,

Matt-

 	  Quote: 	
		   I think I have a similar problem in a spam can. There is a 1/8 plug

 coming out of the intercom that I can plug into a Garmin 496. The

 results are audible but poor. XM radio is barely audible but verbal

 warnings from the 496 are much clearer. Could it be that I need a 1/8

 mono to stereo adapter or is additional wiring required?

 Can I measure the resistance of the adapter to determine if it contains

 more than a solid connection?

 John Morgensen

 Roger Cole wrote:

> Does anyone know if the 1/8-inch phone jack audio output on a Garmin

> 396 is stereo or monaural?  I plan to route this output into the

> monaural input of the intercom.  If the Garmin output is stereo, I can

> do the two-resistor mixer that was mentioned previously in this thread.

>

> Roger Cole

> 1946 Cessna 140, flying

> Murphy Elite #709, working on fuselage

> rcole927(at)earthlink.net <mailto:rcole927(at)earthlink.net>

>

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