Arthur R Bernstein <n2ka@juno.com>: [TenTec] TT 705 Cartridge in headset-boom mike??

[Anthony Bowyer]

Arthur,
    There's not too much that has to be done to power
an electret element. You really don't absolutely need
to get the 705 element. YOu could use a two wire
element from Radio Shack and probably get very good
results. I have a Plantronics headset that I modified
to work with my Pegasus. It had a two wire mike as
well. Here's how mine's done.


                     1k 1/4 watt
Electret    |-------/\/\/\----------> to Pin 4 (+4)
Element     |
-----  +    |     + 6.8 mf Tantalum     
 | |--------|-------| |-------------> to Pin 1 (Mike) 
 | | 
 | |--------------------------------> to Pin 2 (GND)
-----  -                 (Shielded Cable)

  The Resistor and Capacitor are in the mike plug.
That's why I used a tantalum cap and 1/4 watt res. You
could use a 1/8 watt too. I just used what I had on
hand.
  Note the polarity on the electret element and the
Cap.

--- Arthur R Bernstein <n2ka@juno.com> wrote:
> 
> --------- Begin forwarded message ----------
> From: Arthur R Bernstein <n2ka@juno.com>
> To: TenTec@contesting.com
> Subject: [TenTec] TT 705 Cartridge in headset-boom
> mike??
> Date: Tue, 12 Oct 1999 01:33:27 EDT
> __Message-ID: <19991012.012351.4463.0.N2KA@juno.com>
> READ FOLLOWING (PREVIOUSLY POSTED MESSAGE). ANYONE
> HAVE ANY SUGGESTIONS 
> FOR A REPLACEMENT  ELEMENT FOR THIS HEADSET???????
>
__________________________________________________________________
> Hi Group, I've just recently acquired a nice headset
> with a boom mike.
> It's an Azden HS-03. Unfortunately, I don't think
> these are readily
> available in the U.S. anymore, since Azden has
> stopped distribution of
> all their gear in this country. The microphone is
> attached to a thin,
> curved stainless steel tube through which a thin
> shielded mike cable
> runs. It appears to be single conductor shielded.
> I've noticed that the
> output from the mike element is not sufficient to
> drive my OMNI VI very
> well, even with the mike gain cranked way, way up
> (I'm familiar w/cranked
> up mike gain as I use the Heil  HM-10 dual element
> mike.) The cartridge
> is approximately the diameter across of a
> quarter-it's a dynamic with a
> stated impedance of  500 ohms. No specifics given to
> voltage output.
> Frequency response is given as 300-4000hz w/ a 6db
> rise at 2500 hz,
> actually -10db at 300 hz (that's fine.) Was thinking
> of buying a 705
> element from Ten Tec and substituting it into the
> boom mike holder. The
> only problem I see is I believe the 705 is an
> electret and needs +4vdc on
> it,  supplied by pin 4 on the OMNI VI. I dont think
> I could squeeze
> another wire into the mike boom tube tto get the +4v
> on the element. Is
> there another way to do this such as piggybacking
> the 4v on the audio
> line? How would this be done? Or would I have to run
> an external wire
> heat shrink tubed to the boom for the voltage.? This
> setup could be used
> with footswitch if I wire in a
> jack to mike connector between pin 3 and ground.-as
> Heil does.
> Any suggestions or ideas?
> Thanks in advance.
> 73,
> Art, N2KA.. (95% CW!!!) 
>
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