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'[OT]Hooking un an Electret Mic to a tape recorder'
2000\02\06@201700 by Randy Glenn

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Sorry about starting an OT thread, but I have nowhere else to ask.

I have here a brand-new, low-quality microcassette recorder, blessed with a
Mic jack. After choking on RadioShack's prices for a tie-clip mic ($35!??!!!
In your dreams...), I decided I'd like to hook up the 2-wire Electret
element I have here.

Which brings me to my question: How do I hook up this element? Does it need
any support circuitry? Where do I hook up the two terminals (one is ground)
on the mic to the miniplug?

Thanks in advance,

-Randy Glenn
E-Mail: spam_OUTPICxpertTakeThisOuTspamyahoo.com
Web: http://i.am/PICxpert

Currently wondering why I can't get in to Safe Mode - where's a Mac when you
need it?


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2000\02\06@212844 by hgraf

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> I have here a brand-new, low-quality microcassette recorder,
> blessed with a
> Mic jack. After choking on RadioShack's prices for a tie-clip mic
> ($35!??!!!
> In your dreams...), I decided I'd like to hook up the 2-wire Electret
> element I have here.
>
> Which brings me to my question: How do I hook up this element?
> Does it need
> any support circuitry? Where do I hook up the two terminals (one
> is ground)
> on the mic to the miniplug?

    From what I have seen usually electrets require some voltage to be
supplied, some mic jacks don't supply that so the mic doesn't work! :( I
don't know the exact details though. TTYL

2000\02\06@221444 by Robert A. LaBudde

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face
<x-flowed>At 08:12 PM 2/6/00 -0500, Randy wrote:
>I have here a brand-new, low-quality microcassette recorder, blessed with a
>Mic jack. After choking on RadioShack's prices for a tie-clip mic ($35!??!!!
>In your dreams...), I decided I'd like to hook up the 2-wire Electret
>element I have here.
>
>Which brings me to my question: How do I hook up this element? Does it need
>any support circuitry? Where do I hook up the two terminals (one is ground)
>on the mic to the miniplug?

1. You need to run a resistor to Vcc from the + terminal to bias the FET
amplifier. Try to pick a value that gives > 0.5 mA current.

2. You need to tap your output off the + terminal with a coupling capacitor
to block the DC bias. Choose a value to match the desired low frequency
response with the resistor you used.

3. Connect the - terminal to ground.

================================================================
Robert A. LaBudde, PhD, PAS, Dpl. ACAFS  e-mail: .....ralKILLspamspam@spam@lcfltd.com
Least Cost Formulations, Ltd.                   URL: http://lcfltd.com/
824 Timberlake Drive                            Tel: 757-467-0954
Virginia Beach, VA 23464-3239                   Fax: 757-467-2947

"Vere scire est per causae scire"
================================================================

</x-flowed>

2000\02\07@003443 by Gennette Bruce

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face
Electrets have a fet amplifier in them which needs a steady supply.

Look at the back of the mic insert and you'll see one of the connections is
joined to the outer case - this is the 0V connection.  The other is both
power in AND signal out.  You connect +V through a current limiting resistor
to this contact.  You also connect a small capacitor (103, 104) from this
contact to 'mic in'.

Most 'mic in' sockets are 2 wire, so the resistor and capacitor are already
in place inside the recorder, you just have to find which way round the
power is (it is ALMOST always tip = +V, ring = 0V).

Bye.

{Original Message removed}

2000\02\07@101003 by wagner

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face
Some devices are ready to receive an Electret microphone, actually the
most common and cheap microphone. You can try to plut the mic directly
and see what happens.

If it doesn't work, you will need a 3V battery (at least), one resistor
(5k to 10k Ohms) and one capacitor (100nF).

     +3V  (2 small watch cells)
      |
      R 10k
      |
      o----||----> Signal
      |   10nF
   \.---.
    |   | Mic
   /'---'
      |
      o----------> Gnd
      |
     Gnd

You will want to install a power switch.

If you are handy enough, open the microcassete covers, and install the
resistor and capacitor directly inside the unit, using the unit Vcc
power.

Another solution is to buy a cheap computer mic that comes with the
battery compartment and power switch at the back of the mic.  Less than
$6 around.

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