Wanted, electret microphone

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

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

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.

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?

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

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.

"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?

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.

"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.

..
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.