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DIY - In the ear headphones

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echristley(at)nc.rr.com
Guest

Posted: Mon Jul 23, 2007 7:19 pm Post subject: DIY - In the ear headphones

I've been looking into building a in-the-ear type headset using low-end 

earphones, following the example given at 

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

I bought the Phillips ANR headphones from Target.  I've got Jim Weir's 

impedance matching circuit article describing how to use the audio 

transformer, so the headphone portion is  in the bag.



The hangup is with the microphone.  I found some discussions where Jim 

said that an amplifier is needed to use an electret element.  Well, I 

picked up Item# 270-090 from Radio Shack today. 

http://www.radioshack.com/product/index.jsp?summary=summary&techSpecs=techSpecs&currentTab=techSpecs&cp=&custRatings=custRatings&features=features&accessories=accessories&productId 62215&support=support&tab=summary 

It has a wiring diagram on the back of the package that seems to 

indicate that the single transistor amplifier is already built into the 

package.  I was going to ask if that was in fact what it indicates, and 

inquire whether it would work with the RST-443 intercom.   Then I got 

antsy and just went and tried it.  With only two leads, you know I had 

to hook it up backwards and feel disappointed for a minute until I 

figured out to turn the leads around.  Then it was "WOOHOO!!" all the way.



I'm now well on my way to having the equivalent of a $500, in-the-ear 

headset, and it's only costing me about $50.  (Testing is incomplete, 

but others have reported resounding success.)

sportav8r(at)gmail.com
Guest

Posted: Tue Jul 24, 2007 7:57 am Post subject: DIY - In the ear headphones

Keep us posted!



Bill B  ...satisfied Lightspeed Mach one user but out $400...



On 7/23/07, Ernest Christley < echristley(at)nc.rr.com (echristley(at)nc.rr.com)> wrote:[quote]--> AeroElectric-List message posted by: Ernest Christley < echristley(at)nc.rr.com (echristley(at)nc.rr.com)>



I've been looking into building a in-the-ear type headset using low-end

earphones, following the example given at

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

I bought the Phillips ANR headphones from Target.  I've got Jim Weir's

impedance matching circuit article describing how to use the audio 

transformer, so the headphone portion is  in the bag.



The hangup is with the microphone.  I found some discussions where Jim

said that an amplifier is needed to use an electret element.  Well, I

picked up Item# 270-090 from Radio Shack today. 

[url=http://www.radioshack.com/product/index.jsp?summary=summary&techSpecs=techSpecs&currentTab=techSpecs&cp=&custRatings=custRatings&features=features&accessories=accessories&productId 62215&support=support&tab=summary] http://www.radioshack.com/product/index.jsp?summary=summary&techSpecs=techSpecs&currentTab=techSpecs&cp=&custRatings=custRatings&features=features&accessories=accessories&productId 62215&support=support&tab=summary [/url]

It has a wiring diagram on the back of the package that seems to

indicate that the single transistor amplifier is already built into the

package.  I was going to ask if that was in fact what it indicates, and 

inquire whether it would work with the RST-443 intercom.   Then I got

antsy and just went and tried it.  With only two leads, you know I had

to hook it up backwards and feel disappointed for a minute until I

 figured out to turn the leads around.  Then it was "WOOHOO!!" all the way.



I'm now well on my way to having the equivalent of a $500, in-the-ear

headset, and it's only costing me about $50.  (Testing is incomplete,  [quote][b]

jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Tue Jul 24, 2007 8:39 am Post subject: DIY - In the ear headphones

Ernest,

  

 Does the ANR portion of the Phillips headphone  still function after your tweaking? And how do you suspend the  mike?

  

 I am enamored of the Lightspeed Mach One, but if  one can home brew the same thing for $50, I might become an electronerd  yet!

  

 John

   [quote][b]

echristley(at)nc.rr.com
Guest

Posted: Tue Jul 24, 2007 10:27 am Post subject: DIY - In the ear headphones

John Burnaby wrote:

 	  Quote: 	
		   Ernest,

  

 Does the ANR portion of the Phillips headphone still function after 

 your tweaking?

The ANR sits between the plug and the speaker.  I've not verified it 
	


yet, but none of the tweaking I'm attempting should affect the ANR 

function at all.



 	  Quote: 	
		   And how do you suspend the mike?

  

Flox to the end of piano wire that wraps around your head.  For maximum 
	


clarity, you want to encase the mic in a box with just one tiny hole 

directed at your mouth.  Basically, you want to block sound from all 

directions, except where your voice is coming from.  I'm still working 

on this part.

rob(at)hyperion-ef.com
Guest

Posted: Tue Jul 24, 2007 1:13 pm Post subject: DIY - In the ear headphones

Actually the "tin can with a hole in one end" approach to microphone design

will give you an omnidirectional mic, which although intuitive, is not what

you need.  See

http://www.prosoundweb.com/install/spotlight/cardioid/cardioidmics.shtml for

how a unidirectional mic is made. 



Best regards,



Rob Housman



Irvine, California

Europa XS Tri-Gear

S/N A070

Airframe complete 

--

echristley(at)nc.rr.com
Guest

Posted: Tue Jul 24, 2007 2:46 pm Post subject: DIY - In the ear headphones

Rob Housman wrote:

 	  Quote: 	
		   



 Actually the "tin can with a hole in one end" approach to microphone design

 will give you an omnidirectional mic, which although intuitive, is not what

 you need.  See

 http://www.prosoundweb.com/install/spotlight/cardioid/cardioidmics.shtml for

 how a unidirectional mic is made. 



   

Boy, did you save me some rabbit chasing.
	




I've now got all the pieces working (except the microphone housing), and 

I've had to do practically nothing.  The Phillps ANR Earbuds come with a 

1/4" adapter that will plug directly into the intercom.  The sound is 

excellent.  My intercom is mono, so I have some work to do there, but 

there's nothing to do otherwise.  I have to add a 3/16" adapter to the 

end of the microphone, and I think a small bottle cap and a piece of 

foam double-sided tape will make it into a nice cardoid.  The piano wire 

bends nicely around my ears and the back of my head, and is very 

comfortable with a little heatshrink added.

ceengland(at)bellsouth.ne
Guest

Posted: Tue Jul 24, 2007 4:16 pm Post subject: DIY - In the ear headphones

Ernest Christley wrote:

 	  Quote: 	

 <echristley(at)nc.rr.com>

 Rob Housman wrote:

> 

> <rob(at)hyperion-ef.com>

>

> Actually the "tin can with a hole in one end" approach to microphone 

> design

> will give you an omnidirectional mic, which although intuitive, is not 

> what

> you need.  See

> http://www.prosoundweb.com/install/spotlight/cardioid/cardioidmics.shtml 

> for

> how a unidirectional mic is made.

>   

 Boy, did you save me some rabbit chasing.

 I've now got all the pieces working (except the microphone housing), and 

 I've had to do practically nothing.  The Phillps ANR Earbuds come with a 

 1/4" adapter that will plug directly into the intercom.  The sound is 

 excellent.  My intercom is mono, so I have some work to do there, but 

 there's nothing to do otherwise.  I have to add a 3/16" adapter to the 

 end of the microphone, and I think a small bottle cap and a piece of 

 foam double-sided tape will make it into a nice cardoid.  The piano wire 

 bends nicely around my ears and the back of my head, and is very 

 comfortable with a little heatshrink added.

As someone else pointed out, a directional mic would be helpful. Also, 

building one starting with an omni is a non-trivial task. Buying an 

el-cheapo a/c headset or a used one & cannibalizing it for its mic *is* 

a trivial task. (You also get the proper mic connector in the bargain.)

One the guys on an ultralite list I monitor is using ANR earbuds under 

his regular headset. He reports that noise reduction is really good. 

Charlie

rob(at)hyperion-ef.com
Guest

Posted: Tue Jul 24, 2007 4:27 pm Post subject: DIY - In the ear headphones

Yeah, maybe, but the rabbit is still hopping along.  I pointed you to the

theory but now you have to get the design to agree with theory.  The trick

is to calculate the time values in the referenced article so that the sound

from the rear arrives at the front side of the diaphragm in phase with the

sound from the front.  The velocity of sound at 30 deg C is 350

meters/second.



Best regards,



Rob Housman

Irvine, California

Europa XS Tri-Gear

S/N A070

Airframe complete



--

ceengland(at)bellsouth.ne
Guest

Posted: Tue Jul 24, 2007 4:48 pm Post subject: DIY - In the ear headphones

Charlie England wrote:

 	  Quote: 	
		   

 <ceengland(at)bellsouth.net>

 

 Ernest Christley wrote:

> 

> <echristley(at)nc.rr.com>

>

> Rob Housman wrote:

>> 

>> <rob(at)hyperion-ef.com>

>>

>> Actually the "tin can with a hole in one end" approach to microphone 

>> design

>> will give you an omnidirectional mic, which although intuitive, is 

>> not what

>> you need.  See

>> http://www.prosoundweb.com/install/spotlight/cardioid/cardioidmics.shtml 

>> for

>> how a unidirectional mic is made.

>>   

> Boy, did you save me some rabbit chasing.

>

> I've now got all the pieces working (except the microphone housing), 

> and I've had to do practically nothing.  The Phillps ANR Earbuds come 

> with a 1/4" adapter that will plug directly into the intercom.  The 

> sound is excellent.  My intercom is mono, so I have some work to do 

> there, but there's nothing to do otherwise.  I have to add a 3/16" 

> adapter to the end of the microphone, and I think a small bottle cap 

> and a piece of foam double-sided tape will make it into a nice 

> cardoid.  The piano wire bends nicely around my ears and the back of 

> my head, and is very comfortable with a little heatshrink added.

 

 As someone else pointed out, a directional mic would be helpful. Also, 

 building one starting with an omni is a non-trivial task. Buying an 

 el-cheapo a/c headset or a used one & cannibalizing it for its mic *is* 

 a trivial task. (You also get the proper mic connector in the bargain.)

 

 One the guys on an ultralite list I monitor is using ANR earbuds under 

 his regular headset. He reports that noise reduction is really good. 

 

 Charlie

 

 

Well duhhh...
	




Is it obvious that I waited until after posting to read the link?

echristley(at)nc.rr.com
Guest

Posted: Tue Jul 24, 2007 6:29 pm Post subject: DIY - In the ear headphones

Rob Housman wrote:

 	  Quote: 	
		   



 Yeah, maybe, but the rabbit is still hopping along.  I pointed you to the

 theory but now you have to get the design to agree with theory.  The trick

 is to calculate the time values in the referenced article so that the sound

 from the rear arrives at the front side of the diaphragm in phase with the

 sound from the front.  The velocity of sound at 30 deg C is 350

 meters/second.

   

Yeah, that's one way to go about it.
	




Another method involves my Echelon headset and a pair of calipers 8*)

egs(at)egsavage.com
Guest

Posted: Sat Jul 28, 2007 6:50 pm Post subject: DIY - In the ear headphones

Hey Ernest. Looks like you're well along with your project!



I'm not sure what happened, but I see a post I made sometime back to the

EAA1114 list never made it out to the door. Here is a copy of it below..



	--Ed



At a recent builder meeting, I had mentioned this project in the Cozy

community to Ernest. But, this can be used by everyone, not just builders...



Here are a couple of people that give instructions on how to make your own

Clarity Aloft headset clone for around $100. Maybe even approaching under $50

now if you pay attention and find deals.  And when I say a clone, I mean right

down to the same Comply ear tips that are used with the Clarity Aloft.



Check it out...



Nick Ugolini (the original project)

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



Drew Chaplin (latest version by Drew)

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



     --Ed



-- 

Edward G. Savage

egs(at)egsavage.com

Ernest Christley wrote:

 	  Quote: 	
		   I've been looking into building a in-the-ear type headset using low-end 

 earphones, following the example given at 

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

 

 

 I bought the Phillips ANR headphones from Target.  I've got Jim Weir's 

 impedance matching circuit article describing how to use the audio 

 transformer, so the headphone portion is  in the bag.

 

 The hangup is with the microphone.  I found some discussions where Jim 

 said that an amplifier is needed to use an electret element.  Well, I 

 picked up Item# 270-090 from Radio Shack today. 

 http://www.radioshack.com/product/index.jsp?summary=summary&techSpecs=techSpecs&currentTab=techSpecs&cp=&custRatings=custRatings&features=features&accessories=accessories&productId 62215&support=support&tab=summary 

 

 

 It has a wiring diagram on the back of the package that seems to 

 indicate that the single transistor amplifier is already built into the 

 package.  I was going to ask if that was in fact what it indicates, and 

 inquire whether it would work with the RST-443 intercom.   Then I got 

 antsy and just went and tried it.  With only two leads, you know I had 

 to hook it up backwards and feel disappointed for a minute until I 

 figured out to turn the leads around.  Then it was "WOOHOO!!" all the way.

 

 I'm now well on my way to having the equivalent of a $500, in-the-ear 

 headset, and it's only costing me about $50.  (Testing is incomplete, 

 but others have reported resounding success.)

 This list provided courtesy of Safe Data, Inc.

 To leave send an email to eaa1114-request(at)safedataisp.net with the 

 Keyword LEAVE in the body.

echristley(at)nc.rr.com
Guest

Posted: Sun Jul 29, 2007 11:19 am Post subject: DIY - In the ear headphones

I got the message.  What do you think sent me off in a tizzy.  "COOL!! I 

gotta make me wonna those!", as soon as I saw it.

Edward G. Savage wrote:

 	  Quote: 	
		   

 <egs(at)egsavage.com>



 Hey Ernest. Looks like you're well along with your project!



 I'm not sure what happened, but I see a post I made sometime back to the

 EAA1114 list never made it out to the door. Here is a copy of it below..



     --Ed



 At a recent builder meeting, I had mentioned this project in the Cozy

 community to Ernest. But, this can be used by everyone, not just 

 builders...



 Here are a couple of people that give instructions on how to make your 

 own

 Clarity Aloft headset clone for around $100. Maybe even approaching 

 under $50

 now if you pay attention and find deals.  And when I say a clone, I 

 mean right

 down to the same Comply ear tips that are used with the Clarity Aloft.



 Check it out...



 Nick Ugolini (the original project)

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

 Drew Chaplin (latest version by Drew)

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



     --Ed




	




-- 

"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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