Help to ID this Microphone type

X

Xanax

Guest
hi all,
I took two microphones out of an old 1980's tape recorder and I want to
incorporate them into am FM bug type circuit.
Only think is I don't know that type of mic it is.
It's a silver can shape with black felt material covering the top. Is this a
carbon mic or an electric or a fet mic?
I'm no expert on mics as you can tell!!

Cheers,
Xanax.
 
"Xanax" <jo@fo.mo> wrote in message
news:n8Enb.2923$bD.13447@news.indigo.ie...
hi all,
I took two microphones out of an old 1980's tape recorder and I want to
incorporate them into am FM bug type circuit.
Only think is I don't know that type of mic it is.
It's a silver can shape with black felt material covering the top. Is this
a
carbon mic or an electric or a fet mic?
I'm no expert on mics as you can tell!!
Click to expand...

Most likely an electret, with a built-in FET impedance converter.
 
In article <n8Enb.2923$bD.13447@news.indigo.ie>, jo@fo.mo mentioned...
hi all,
I took two microphones out of an old 1980's tape recorder and I want to
incorporate them into am FM bug type circuit.
Only think is I don't know that type of mic it is.
It's a silver can shape with black felt material covering the top. Is this a
carbon mic or an electric or a fet mic?
I'm no expert on mics as you can tell!!

Cheers,
Xanax.
Click to expand...
If you can measure some resistance across the terminals it's probably
a dynamic mic, which is like a miniature speaker. If it measures open
circuit, then it might be a high impedance ceramic mic, which were
sometimes used on old tube equipment. But I would guess that it's
probably a dynamic mic.

Post a URL of the schematic for your FM wireless mic, and we may be
able to tell you if it will work, or how to modify it to make it work.

--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
 
In article <vpu7r734qga8db@corp.supernews.com>,
walterh@cafewalterNOSPAM.com mentioned...
"Xanax" <jo@fo.mo> wrote in message
news:n8Enb.2923$bD.13447@news.indigo.ie...
hi all,
I took two microphones out of an old 1980's tape recorder and I want to
incorporate them into am FM bug type circuit.
Only think is I don't know that type of mic it is.
It's a silver can shape with black felt material covering the top. Is this
a
carbon mic or an electric or a fet mic?
I'm no expert on mics as you can tell!!


Most likely an electret, with a built-in FET impedance converter.
Click to expand...
If the mic element is 3/4" (20mm) diameter and about the same length,
then I'd say it's a dynamic mic. In the '80s, electret mics weren't
that common, and the three wire electrets would require a special
cable and three conductor plug and jack for the additional power wire.


--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
 
On Tue, 28 Oct 2003 22:29:05 -0800, Watson A.Name - "Watt Sun, Dark
Remover" <alondra101@hotmail.com> wrote:

In article <vpu7r734qga8db@corp.supernews.com>,
walterh@cafewalterNOSPAM.com mentioned...
"Xanax" <jo@fo.mo> wrote in message
news:n8Enb.2923$bD.13447@news.indigo.ie...
hi all,
I took two microphones out of an old 1980's tape recorder and I want to
incorporate them into am FM bug type circuit.
Only think is I don't know that type of mic it is.
It's a silver can shape with black felt material covering the top. Is this
a
carbon mic or an electric or a fet mic?
I'm no expert on mics as you can tell!!


Most likely an electret, with a built-in FET impedance converter.

If the mic element is 3/4" (20mm) diameter and about the same length,
then I'd say it's a dynamic mic. In the '80s, electret mics weren't
that common, and the three wire electrets would require a special
cable and three conductor plug and jack for the additional power wire.
Click to expand...
They were, as the built in MIC in tape recorders and cordless phones.
 
There is a resistanc if 1.2KOhms across the two terminals.
And yes it's about as wide as it is long.

I suppose now all I need to know is can I just put it on the base and ground
of a transistor amp
and get amplification from it or does it require something extra?

There are only two terminals on the mic.
Cheers,
Xanax.
"Watson A.Name - Watt Sun, Dark Remover" <alondra101@hotmail.com> wrote in
message news:MPG.1a08fcfe7f6029ba989855@news.dslextreme.com...
In article <n8Enb.2923$bD.13447@news.indigo.ie>, jo@fo.mo mentioned...
hi all,
I took two microphones out of an old 1980's tape recorder and I want to
incorporate them into am FM bug type circuit.
Only think is I don't know that type of mic it is.
It's a silver can shape with black felt material covering the top. Is
this a
carbon mic or an electric or a fet mic?
I'm no expert on mics as you can tell!!

Cheers,
Xanax.

If you can measure some resistance across the terminals it's probably
a dynamic mic, which is like a miniature speaker. If it measures open
circuit, then it might be a high impedance ceramic mic, which were
sometimes used on old tube equipment. But I would guess that it's
probably a dynamic mic.

Post a URL of the schematic for your FM wireless mic, and we may be
able to tell you if it will work, or how to modify it to make it work.

--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
Click to expand...
 
Xanax wrote:
There is a resistanc if 1.2KOhms across the two terminals.
And yes it's about as wide as it is long.

I suppose now all I need to know is can I just put it on the base and ground
of a transistor amp
and get amplification from it or does it require something extra?
Click to expand...
That'll work - bias the transistor properly and
feed the mic to the base through a cap.
See the urls below for some ideas.

http://members.shaw.ca/novotill/DynamicMicPreamp/index.htm
http://www.hut.fi/Misc/Electronics/circuits/micamp.html
http://www.cc.rim.or.jp/~midorin/mad-p/incom/index_oldver.html
http://www.mitedu.freeserve.co.uk/Circuits/Audio/dyn_mic/dyn_mic.htm
 
In article <hpmvpv0ikk027csbmcrh2bj5s9p3jets1i@4ax.com>,
classicsat@yahoo.moc mentioned...
On Tue, 28 Oct 2003 22:29:05 -0800, Watson A.Name - "Watt Sun, Dark
Remover" <alondra101@hotmail.com> wrote:

In article <vpu7r734qga8db@corp.supernews.com>,
walterh@cafewalterNOSPAM.com mentioned...
"Xanax" <jo@fo.mo> wrote in message
news:n8Enb.2923$bD.13447@news.indigo.ie...
hi all,
I took two microphones out of an old 1980's tape recorder and I want to
incorporate them into am FM bug type circuit.
Only think is I don't know that type of mic it is.
It's a silver can shape with black felt material covering the top. Is this
a
carbon mic or an electric or a fet mic?
I'm no expert on mics as you can tell!!


Most likely an electret, with a built-in FET impedance converter.

If the mic element is 3/4" (20mm) diameter and about the same length,
then I'd say it's a dynamic mic. In the '80s, electret mics weren't
that common, and the three wire electrets would require a special
cable and three conductor plug and jack for the additional power wire.

They were, as the built in MIC in tape recorders and cordless phones.
Click to expand...
Sorry, I wasn't thinking about a built-in mic, _inside_ the TR. I was
thinking of a mic on a shielded cable, phone plug, etc.

--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
 
In article <XVUnb.3058$bD.14048@news.indigo.ie>, jo@fo.mo mentioned...
There is a resistanc if 1.2KOhms across the two terminals.
And yes it's about as wide as it is long.

I suppose now all I need to know is can I just put it on the base and ground
of a transistor amp
and get amplification from it or does it require something extra?

There are only two terminals on the mic.
Click to expand...
Try this: http://www.epanorama.net/circuits/microphone_powering.html

Cheers,
Xanax.
[snip]
Post a URL of the schematic for your FM wireless mic, and we may be
able to tell you if it will work, or how to modify it to make it work.

--
Click to expand...
--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
 
Thanks! alot thats great people!!

Xanax.
"Watson A.Name - Watt Sun, Dark Remover" <alondra101@hotmail.com> wrote in
message news:MPG.1a0a2e86ede7877d98986c@news.dslextreme.com...
In article <XVUnb.3058$bD.14048@news.indigo.ie>, jo@fo.mo mentioned...
There is a resistanc if 1.2KOhms across the two terminals.
And yes it's about as wide as it is long.

I suppose now all I need to know is can I just put it on the base and
ground
of a transistor amp
and get amplification from it or does it require something extra?

There are only two terminals on the mic.

Try this: http://www.epanorama.net/circuits/microphone_powering.html

Cheers,
Xanax.
[snip]
Post a URL of the schematic for your FM wireless mic, and we may be
able to tell you if it will work, or how to modify it to make it work.

--

--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
Click to expand...
 
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