Wanted, electret microphone

[noname]

The microphone in my old headset went TU and need a replacement.
Anybody have a working one they would like to part with?

Thanks

Dave

[[email protected]]

On Aug 23, 12:46 pm, noname > wrote:
> The microphone in my old headset went TU and need a replacement.
> Anybody have a working one they would like to part with?
>
> Thanks
>
> Dave

You could probably fix it with the electret mike from a
cheap telephone (not an old carbon-mike phone). I built a headset once
and used the mike from a $3 corded phone, no preamp or anything, and
it worked OK. Had to put a small capacitor across it to bleed off some
of the high freqencies. The mike itself was maybe 3/8" diameter, about
the same thick, and fit nicely into a holder carved of wood.

Dan

[Mike[_22_]]

> wrote in message
...
> On Aug 23, 12:46 pm, noname > wrote:
>> The microphone in my old headset went TU and need a replacement.
>> Anybody have a working one they would like to part with?
>>
>> Thanks
>>
>> Dave
>
> You could probably fix it with the electret mike from a
> cheap telephone (not an old carbon-mike phone). I built a headset once
> and used the mike from a $3 corded phone, no preamp or anything, and
> it worked OK. Had to put a small capacitor across it to bleed off some
> of the high freqencies. The mike itself was maybe 3/8" diameter, about
> the same thick, and fit nicely into a holder carved of wood.
>
> Dan

That sounds like a lot of work to develop something that's going to be less
effective than a replacement, but I can't say I'm innocent of spending way
too many man-hours trying to save a few bucks. The problem with using one
from a telephone is I don't think the impedence matches up and most aviation
mics have some type of noise cancelling circuitry.

[john smith]

In article <NBmsk.718$lf2.305@trnddc07>, "Mike" >
wrote:

> > wrote in message
> ...
> > On Aug 23, 12:46 pm, noname > wrote:
> >> The microphone in my old headset went TU and need a replacement.
> >> Anybody have a working one they would like to part with?
> >>
> >> Thanks
> >>
> >> Dave
> >
> > You could probably fix it with the electret mike from a
> > cheap telephone (not an old carbon-mike phone). I built a headset once
> > and used the mike from a $3 corded phone, no preamp or anything, and
> > it worked OK. Had to put a small capacitor across it to bleed off some
> > of the high freqencies. The mike itself was maybe 3/8" diameter, about
> > the same thick, and fit nicely into a holder carved of wood.
> >
> > Dan
>
> That sounds like a lot of work to develop something that's going to be less
> effective than a replacement, but I can't say I'm innocent of spending way
> too many man-hours trying to save a few bucks. The problem with using one
> from a telephone is I don't think the impedence matches up and most aviation
> mics have some type of noise cancelling circuitry.

What makes you think the impedence of the ones in the telephones are
different from the ones in your headset?

[dave]

John Smith wrote:
> In article <NBmsk.718$lf2.305@trnddc07>, "Mike" >
> wrote:
>
>> > wrote in message
>> ...
>>> On Aug 23, 12:46 pm, noname > wrote:
>>>> The microphone in my old headset went TU and need a replacement.
>>>> Anybody have a working one they would like to part with?
>>>>
>>>> Thanks
>>>>
>>>> Dave
>>> You could probably fix it with the electret mike from a
>>> cheap telephone (not an old carbon-mike phone). I built a headset once
>>> and used the mike from a $3 corded phone, no preamp or anything, and
>>> it worked OK. Had to put a small capacitor across it to bleed off some
>>> of the high freqencies. The mike itself was maybe 3/8" diameter, about
>>> the same thick, and fit nicely into a holder carved of wood.
>>>
>>> Dan
>> That sounds like a lot of work to develop something that's going to be less
>> effective than a replacement, but I can't say I'm innocent of spending way
>> too many man-hours trying to save a few bucks. The problem with using one
>> from a telephone is I don't think the impedence matches up and most aviation
>> mics have some type of noise cancelling circuitry.
>
> What makes you think the impedence of the ones in the telephones are
> different from the ones in your headset?

I'd rather not cobble something up if I can help it. I was just looking
for somebody with an old headset with a workable microphone that still
works.



Dave

[Orval Fairbairn[_2_]]

In article >,
Dave > wrote:

> John Smith wrote:
> > In article <NBmsk.718$lf2.305@trnddc07>, "Mike" >
> > wrote:
> >
> >> > wrote in message
> >> ...
> >>> On Aug 23, 12:46 pm, noname > wrote:
> >>>> The microphone in my old headset went TU and need a replacement.
> >>>> Anybody have a working one they would like to part with?
> >>>>
> >>>> Thanks
> >>>>
> >>>> Dave
> >>> You could probably fix it with the electret mike from a
> >>> cheap telephone (not an old carbon-mike phone). I built a headset once
> >>> and used the mike from a $3 corded phone, no preamp or anything, and
> >>> it worked OK. Had to put a small capacitor across it to bleed off some
> >>> of the high freqencies. The mike itself was maybe 3/8" diameter, about
> >>> the same thick, and fit nicely into a holder carved of wood.
> >>>
> >>> Dan
> >> That sounds like a lot of work to develop something that's going to be
> >> less
> >> effective than a replacement, but I can't say I'm innocent of spending way
> >> too many man-hours trying to save a few bucks. The problem with using one
> >> from a telephone is I don't think the impedence matches up and most
> >> aviation
> >> mics have some type of noise cancelling circuitry.
> >
> > What makes you think the impedence of the ones in the telephones are
> > different from the ones in your headset?
>
> I'd rather not cobble something up if I can help it. I was just looking
> for somebody with an old headset with a workable microphone that still
> works.
>
>
>
> Dave

If it is a David Clark, they will replace for free at fly-ins, where DC
has a rep.

--
Remove _'s from email address to talk to me.

[Mike[_22_]]

"John Smith" > wrote in message
...
> In article <NBmsk.718$lf2.305@trnddc07>, "Mike" >
> wrote:
>
>> > wrote in message
>> ...
>> > On Aug 23, 12:46 pm, noname > wrote:
>> >> The microphone in my old headset went TU and need a replacement.
>> >> Anybody have a working one they would like to part with?
>> >>
>> >> Thanks
>> >>
>> >> Dave
>> >
>> > You could probably fix it with the electret mike from a
>> > cheap telephone (not an old carbon-mike phone). I built a headset once
>> > and used the mike from a $3 corded phone, no preamp or anything, and
>> > it worked OK. Had to put a small capacitor across it to bleed off some
>> > of the high freqencies. The mike itself was maybe 3/8" diameter, about
>> > the same thick, and fit nicely into a holder carved of wood.
>> >
>> > Dan
>>
>> That sounds like a lot of work to develop something that's going to be
>> less
>> effective than a replacement, but I can't say I'm innocent of spending
>> way
>> too many man-hours trying to save a few bucks. The problem with using
>> one
>> from a telephone is I don't think the impedence matches up and most
>> aviation
>> mics have some type of noise cancelling circuitry.
>
> What makes you think the impedence of the ones in the telephones are
> different from the ones in your headset?

Because they are two different devices used in two different applications.
All microphones, even electret models, don't have the same impedence and
there are wide variances depending on the application. Even a mic removed
from a DC military headset won't work well in their civilian version because
of the differences in impedence.

What makes you think they are the same?

[john smith]

In article <%kqsk.741$lf2.630@trnddc07>, "Mike" >
wrote:

> > What makes you think the impedence of the ones in the telephones are
> > different from the ones in your headset?
>
> Because they are two different devices used in two different applications.
> All microphones, even electret models, don't have the same impedence and
> there are wide variances depending on the application. Even a mic removed
> from a DC military headset won't work well in their civilian version because
> of the differences in impedence.
>
> What makes you think they are the same?

The voltages and currents they are typically designed to work at.

[Mike[_22_]]

"John Smith" > wrote in message
...
> In article <%kqsk.741$lf2.630@trnddc07>, "Mike" >
> wrote:
>
>> > What makes you think the impedence of the ones in the telephones are
>> > different from the ones in your headset?
>>
>> Because they are two different devices used in two different
>> applications.
>> All microphones, even electret models, don't have the same impedence and
>> there are wide variances depending on the application. Even a mic
>> removed
>> from a DC military headset won't work well in their civilian version
>> because
>> of the differences in impedence.
>>
>> What makes you think they are the same?
>
> The voltages and currents they are typically designed to work at.

Which can vary widely in telephones and don't by themselves determine
impedence anyway.

Some telephone electret mics are 1000 ohms and civilian headset electret
mics are typically 50 ohms. That's not to say there aren't telephone
electret mics that are also 50 ohms, but I suspect most are higher.

[RST Engineering]

..
I've been watching this thread for some time and what is said below is just
busslit. No native electret mic that was ever made was 50 ohms, nor are
aircraft microphones 50 ohms nor are thelphone electret mikes 1k. You are
blowing smoke.

BTW, having been in the aircraft headset business for twenty years and
change, I can tell you that when a clown like this comes on asking where to
get a "replacement mic" without telling you the manufacturer and model of
the headset, he is trolling for ANY microphone that he can use to convert a
Harbor Freight type headset to aircraft use on the cheap.

Jim


>
> Some telephone electret mics are 1000 ohms and civilian headset electret
> mics are typically 50 ohms. That's not to say there aren't telephone
> electret mics that are also 50 ohms, but I suspect most are higher.

[Mike[_22_]]

"RST Engineering" > wrote in message
m...
> .
> I've been watching this thread for some time and what is said below is
> just busslit. No native electret mic that was ever made was 50 ohms, nor
> are aircraft microphones 50 ohms nor are thelphone electret mikes 1k. You
> are blowing smoke.

Ah yes, the qualifier "native". Now tell us the rest of the story.

Microphone: Noise-Cancelling M-7A Electret (nominal 50 ohm).
Mic Impedance: 50 ohms +/- 20%
http://www.davidclark.com/avHeadsetSpecs/avSpecs.aspx?ModelName=H10-13.4

Here's a couple of telephone headsets with impedences listed:
TRANSMIT SPECIFICATIONS
Microphone: Noise canceling electret
Ambient noise suppression: 13db @ 1kHz, typical
Output impedance: 1.8k Ohms typical

TRANSMIT SPECIFICATIONS
Microphone: Noise canceling electret
Impedance: Low. (~300 Ohm)
http://www.vxicorp.com/support/pdf/CallCenter/VXICiscoHeadsets.pdf


> BTW, having been in the aircraft headset business for twenty years and
> change, I can tell you that when a clown like this comes on asking where
> to get a "replacement mic" without telling you the manufacturer and model
> of the headset, he is trolling for ANY microphone that he can use to
> convert a Harbor Freight type headset to aircraft use on the cheap.

Or a DC military headset which you can buy cheaply on ebay along with a
cheap 1 to 2 plug adapter, but they don't work worth a crap unless you swap
the mic.

[RST Engineering]

So which of it is it, jerknose? You bought a stolen military headset on
ebay or you are trying to convert a Best Buy stereo headset to aircraft use?

Jim


> Or a DC military headset which you can buy cheaply on ebay along with a
> cheap 1 to 2 plug adapter, but they don't work worth a crap unless you
> swap the mic.

[Mike[_22_]]

"RST Engineering" > wrote in message
m...
>
> So which of it is it, jerknose? You bought a stolen military headset on
> ebay or you are trying to convert a Best Buy stereo headset to aircraft
> use?

I'm not the one looking for a mic, Edison.

I have 4 headsets, all bought new from a reputable dealer, but thanks for
your heartfelt concern.


>
> Jim
>
>
>> Or a DC military headset which you can buy cheaply on ebay along with a
>> cheap 1 to 2 plug adapter, but they don't work worth a crap unless you
>> swap the mic.
>
>

[dave]

Mike wrote:
> "RST Engineering" > wrote in message
> m...
>>
>> So which of it is it, jerknose? You bought a stolen military headset
>> on ebay or you are trying to convert a Best Buy stereo headset to
>> aircraft use?
>
> I'm not the one looking for a mic, Edison.
>
> I have 4 headsets, all bought new from a reputable dealer, but thanks
> for your heartfelt concern.
>
>
>>
>> Jim
>>
>>
>>> Or a DC military headset which you can buy cheaply on ebay along with
>>> a cheap 1 to 2 plug adapter, but they don't work worth a crap unless
>>> you swap the mic.
>>
>>
>
Chill everyone!!

I'm the one who needs the microphone, this thread has morphed like most
others and has gone off topic.

I'm sending in my PCA(aka. lighspeed) ANR back due to popping noise in
the earpiece and found my backup headset sounds like I talking through
an old fuzz box.

My mistake is, I'm living 1500 miles away from home at a contract job
and a spare microphone from an old Pilot headset is in Dallas somewhere
and I'm in Connecticut.
Still, no one has come up with an old microphone. I suspect lots of
people have them laying around in old crappy headsets.

ARGH, I'll have to resort to an hand mike until my other comes back from
the factory.

Dave

[Edward A. Falk]

In article >,
Orval Fairbairn > wrote:
>
>If it is a David Clark, they will replace for free at fly-ins, where DC
>has a rep.

Really? Even if it's really old?

I now have two out of four of my headsets with dead mics, and it's very
annoying.

--
-Ed Falk,
http://thespamdiaries.blogspot.com/

[Mike[_22_]]

"Edward A. Falk" > wrote in message
...
> In article
> >,
> Orval Fairbairn > wrote:
>>
>>If it is a David Clark, they will replace for free at fly-ins, where DC
>>has a rep.
>
> Really? Even if it's really old?
>
> I now have two out of four of my headsets with dead mics, and it's very
> annoying.

I'm not so sure they still do. At one time a dealer could send your headset
back to DC and they would fix pretty much anything for free. My dealer
informs me this is no longer the case although they might still make minor
repairs for free. I've never tried having one serviced during a fly-in, so
that's certainly worth a try if you can find a rep out in the field.

[David Lesher]

"Mike" > writes:


>I'm not so sure they still do. At one time a dealer could send your headset
>back to DC and they would fix pretty much anything for free. My dealer
>informs me this is no longer the case although they might still make minor
>repairs for free. I've never tried having one serviced during a fly-in, so
>that's certainly worth a try if you can find a rep out in the field.

They did this to a friend's at Sun & Fun circa 2000.


--
A host is a host from coast to
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

[Mike[_22_]]

"David Lesher" > wrote in message
...
> "Mike" > writes:
>
>
>>I'm not so sure they still do. At one time a dealer could send your
>>headset
>>back to DC and they would fix pretty much anything for free. My dealer
>>informs me this is no longer the case although they might still make minor
>>repairs for free. I've never tried having one serviced during a fly-in,
>>so
>>that's certainly worth a try if you can find a rep out in the field.
>
> They did this to a friend's at Sun & Fun circa 2000.

I had a DC repaired around the same time. Used to be you could send them a
frazled hunk of crap with a DC logo on the side and they would send you back
a fully overhauled headset with new ear pads and a new mic cover. It was
just last year my dealer was telling me the only company still doing major
out of warranty repairs for free was Lightspeed. Perhaps she was just
blowing smoke and was trying to sell me Lightspeed, I don't know, but she is
also a DC dealer so I don't know why she would.

It would be interesting to see if anyone has had a DC repaired for free
lately and what those repairs were.