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Homemade Aviation Headset

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bbradburry(at)bellsouth.n
Guest

Posted: Sun Aug 05, 2007 6:17 am Post subject: Homemade Aviation Headset

I am considering trying to make a headset as is described in the link below:



http://www.cozy1200.com/geeklog/article.php?story 070427102533266 



I am confused by the fact that the transformer he suggests to use from Radio

Shack is 1000 ohm input/8 ohm output.  The plane system is going to be

looking for a 600 ohm input???



What will this 1000 ohm transformer do to the plane system?  Will it harm

it?  Will the system output be louder or softer with the 1000 ohm than it

would have been with a 600 ohm transformer?



If I knew what I was doing here I would probably afraid to proceed.  As it

is I am fearless....:>)



Thanks for your assistance.



Bill B

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echristley(at)nc.rr.com
Guest

Posted: Sun Aug 05, 2007 7:09 am Post subject: Homemade Aviation Headset

Bill Bradburry wrote:

 	  Quote: 	
		   



 I am considering trying to make a headset as is described in the link below:



 http://www.cozy1200.com/geeklog/article.php?story 070427102533266 



 I am confused by the fact that the transformer he suggests to use from Radio

 Shack is 1000 ohm input/8 ohm output.  The plane system is going to be

 looking for a 600 ohm input???



 What will this 1000 ohm transformer do to the plane system?  Will it harm

 it?  Will the system output be louder or softer with the 1000 ohm than it

 would have been with a 600 ohm transformer?



 If I knew what I was doing here I would probably afraid to proceed.  As it

 is I am fearless....:>)



 Thanks for your assistance.



   


	


Bill, I just made a set and tested it in both my embryonic project and 

it a fellow chapter member's Cherokee.  I used Phillips ANR earplugs.  I 

used the 1/4" adapter supplied with the earbuds and got excellent audio 

quality. 



I used a $2.59 electret microphone from Radio Shack.  In the Cherokee, 

the voice quality was BETTER through the Radio Shack mic, wired directly 

to a homemade 3/16" mic plug with no additional electronics, than 

through my Telex Echelon headsets.    I do not know what sort of 

intercom he was using.  I built one of RST-Engineering's intercoms for 

my project.  The Radio Shack mic was obviously loading down the input 

circuit to the intercom (it draws amplifying power from the input 

circuit).  The voice input was fine with my homemade headset or the 

Echelons if used individually, but dropped to a very low level if both 

were plugged in simultaneously.



-- 

"Life is not a journey to the grave with the intention of arriving safely in 

a pretty and well preserved body, but rather to skid in broadside, 

thoroughly used up, totally worn out, with chocolate in one hand and wine in 

the other, loudly proclaiming 'WOO HOO What a Ride!'"

--Unknown

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bob(at)bob-white.com
Guest

Posted: Sun Aug 05, 2007 8:05 am Post subject: Homemade Aviation Headset

On Sun, 5 Aug 2007 10:16:47 -0400

"Bill Bradburry" <bbradburry(at)bellsouth.net> wrote:



 	  Quote: 	
		   

 

 I am considering trying to make a headset as is described in the link below:

 

 http://www.cozy1200.com/geeklog/article.php?story 070427102533266 

 

 I am confused by the fact that the transformer he suggests to use from Radio

 Shack is 1000 ohm input/8 ohm output.  The plane system is going to be

 looking for a 600 ohm input???

 

 What will this 1000 ohm transformer do to the plane system?  Will it harm

 it?  Will the system output be louder or softer with the 1000 ohm than it

 would have been with a 600 ohm transformer?

 

 If I knew what I was doing here I would probably afraid to proceed.  As it

 is I am fearless....:>)

 

 Thanks for your assistance.

 

 Bill B 


	


Hi Bill,



The 1000 ohm transformer will not load a 600 ohm circuit quite as

much.  In audio circuits, you need to match impedance to maximize power

transfer.  If you don't need maximum power transfer, and you probably

don't, it should work just fine.



Bob W.



-- 

N93BD - Rotary Powered BD-4 - http://www.bob-white.com

3.8 Hours Total Time and holding

Cables for your rotary installation - http://www.roblinphoto.com/shop/

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cnpeters

Joined: 24 Aug 2006
Posts: 23
Location: Bloomington/Normal, IL

Posted: Mon Aug 06, 2007 9:00 pm Post subject: Homemade Aviation Headset

Getting ready to do the same, and have all the parts and an old headset 

to gut for the mic, cords, and plugs.

A couple simple Q's:

1) And the most basic of questions - if I build a stereo headset, is 

there any problem with a stereo plug in a mono intercom system jack? I 

assume I will just hear monaural sound.

2) One builder put in pots and another just added resistors to adjust 

the ear speakers to match other headsets (in case someone flying with 

you uses a different headset) - has anyone built one without these? I 

guess I will need to experiment, and it will depend on the sensitivity 

of the in-ear speakers. I did get the Comply headset with their 

proprietary tips that are wonderful. The set looks to be the same from 

TrickAudio. Haven't tested in the air, but cuts out the wife and kids 

nicely...I mean excessive noises. After two hours in the ear, the 

comfort is wonderful - really don't notice the tips. The set is nice 

enough that I will have it jack separately into the project box so I can 

use them elsewhere besides the plane.

http://www.canardzone.com/members/nickugolini/CuplessHeadet/cupless_headset.htm

http://www.cozy1200.com/geeklog/index.php

http://www.trickearphones.com/index.htm

Carl

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_________________
Carl Peters
RV-9A wings

wrmaxwell(at)bigpond.com
Guest

Posted: Mon Aug 06, 2007 9:05 pm Post subject: Homemade Aviation Headset

and if you run two such headsets at the same time, the 1000 ohms falls to 

500 ohms, a much better match?



Bill

---

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echristley(at)nc.rr.com
Guest

Posted: Tue Aug 07, 2007 4:54 am Post subject: Homemade Aviation Headset

Carl Peters wrote:

 	  Quote: 	
		   

 <say.ahh1(at)verizon.net>



 Getting ready to do the same, and have all the parts and an old 

 headset to gut for the mic, cords, and plugs.

 A couple simple Q's:

 1) And the most basic of questions - if I build a stereo headset, is 

 there any problem with a stereo plug in a mono intercom system jack? I 

 assume I will just hear monaural sound.

No the stereo plug was designed around the mono plug to be 
	


interchangable.  You'll simply get sound in one ear when you plug a 

stereo headphone into a mono jack.



My intercom is mono, and I don't want to modify the headphones (so that 

I can use them elsewhere, as you state).  The stereo jack has three 

contacts: ground, left and right.  The stereo plug has 3 regions.  The 

sleeve closest to the plastic is ground.  The middle area is left and 

the tip is right (I think.  I may have left and right reversed).  By 

jumpering the left and right together in the jack, I get sound in both 

ears without modifying the phones.  This also drops the 1000ohm to 500 

as Bill stated.

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echristley(at)nc.rr.com
Guest

Posted: Tue Aug 07, 2007 4:56 am Post subject: Homemade Aviation Headset

Carl Peters wrote:

 	  Quote: 	
		   2) One builder put in pots and another just added resistors to adjust 

 the ear speakers to match other headsets (in case someone flying with 

 you uses a different headset) - has anyone built one without these? I 

 guess I will need to experiment, and it will depend on the sensitivity 

 of the in-ear speakers.


	


The intercom has a volume control.  Most aviation headsets have a volume 

control.  I'll set the volume to my comfort with the intercom, and let 

everyone else adjust to that.  If it gets to be a problem, a pot can be 

added easily enough later.



Another option is that there are lots of earbuds with inline volume 

control already.

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