Help to ID this Microphone type

[Xanax]

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.

 

[Walter Harley]

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.

 

[Watson A.Name - Watt Sun, Dark Remover]

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.

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[Watson A.Name - Watt Sun, Dark Remover]

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.


--
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###Got a Question about ELECTRONICS? Check HERE First:###
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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
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[Gary Tait]

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.

 

[Xanax]

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.

 

[[email protected]]

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?

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

 

[Watson A.Name - Watt Sun, Dark Remover]

They were, as the built in MIC in tape recorders and cordless phones.

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.

--
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###Got a Question about ELECTRONICS? Check HERE First:###
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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@@

 

[Watson A.Name - Watt Sun, Dark Remover]

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@@

 

[Xanax]

Thanks! alot thats great people!!

Xanax.

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@@