Newbie electret questions from electronman,

[electronman]

Newbie Electret questions from electronman,

I have a Sony T8 electret microphone with 3 connectors. I'm assuming
that one is positive, one is negative, and one is the signal(?).
There are 3 colored wires: red, white, and blue, coming from the tape
recorder, which is now disconnected from the mike. The wire diameter
is probably 1/2 of standard 22 gauge. I'm going to build a pre-amp
to insert between the mike and the 3 colored leads to substantially
improve the gain. My questions are: 1) given the very tiny size of
the mike connectors and the very small gauge wire, what kind of
soldering iron (tip?) will I need to be able to make a good solder
connection? 2) how much danger is there that the heat from the iron
will damage the mike? 3) I've never seen wire that small: where can I
even purchase some? 4) given the 3 colored wires, how do I determine
which colored wire should be connected to which mike connector? The
mike configuration looks like this:

1 2
.. .

 

[kell]

I would like to Email a photo of my preamp schematic circuit to this
group as opposed to trying to create an ASCII schematic, but I haven't
seen any other posts that do that ... is that permissible?

You could upload your photo to a free web-based photo service and post
a link to it. www.webshots.com has a free service. maybe snapfish
does too.

 

[jasen]

Newbie Electret questions from electronman,

I have a Sony T8 electret microphone with 3 connectors. I'm assuming
that one is positive, one is negative, and one is the signal(?).
There are 3 colored wires: red, white, and blue, coming from the tape
recorder, which is now disconnected from the mike. The wire diameter
is probably 1/2 of standard 22 gauge. I'm going to build a pre-amp
to insert between the mike and the 3 colored leads to substantially
improve the gain. My questions are: 1) given the very tiny size of
the mike connectors and the very small gauge wire, what kind of
soldering iron (tip?) will I need to be able to make a good solder
connection? 2) how much danger is there that the heat from the iron
will damage the mike? 3) I've never seen wire that small: where can I
even purchase some? 4) given the 3 colored wires, how do I determine
which colored wire should be connected to which mike connector? The
mike configuration looks like this:

1 2
. .
.
3

There is a resistance of 35 ohms between connector 1 and 2, and no
resistance between the other connectors. Should I just purchase a new
electret mike? The present mike is about 15 years old; I have no
problem with that if it's the best solution.

without knowing who made it it's hard to locate the data sheet.

there's only 6 possible 3-wire configurations and only one of them, will work
well if you use a low supply voltage while testing your're unlikely to
damage it.

I'm guessing that 3 is ground and 1 or 2 in drain (v+) and the other is
source (output).

http://www.derry.gentexcorp.com/selectguide.htm

I'd try to get it with a from 1.5v supply and when you find the
configuration that works best then increase the supply

I would like to Email a photo of my preamp schematic circuit to this
group as opposed to trying to create an ASCII schematic, but I haven't
seen any other posts that do that ... is that permissible?

There's no email address for "this group"
Attacments won't get far if attached to posts here.

if tongaken.org don't give you web space you could stick a photo up on
some free web-hosting service like geocities, preferably not one of
those annoying ones that serve ask readers for money on three pages before
you get to see the photo.




Bye.
Jasen