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'[EE] Plantronics Headset Interface Help Needed'
2011\11\28@173348 by Carey Fisher

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Can anyone tell me how to interface to the microphone of a Plantronics
Headset that uses the dual, 3 circuit, WECO-type plug (it looks like two
stereo plugs in one shell).  I know the pinouts: Sleeves = earpiece, rings
= PTT and tips = microphone. PTT and earpiece are working but I haven't
been able to get mic audio from the headset.  I've tried the typical
Electret circuit (5VDC through a 2k2 resistor) but no audio.  Any chance
the mic is a dynamic mic?
-- Carey Fishe

2011\11\28@194008 by Dwayne Reid

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At 03:33 PM 11/28/2011, Carey Fisher wrote:
>Can anyone tell me how to interface to the microphone of a Plantronics
>Headset that uses the dual, 3 circuit, WECO-type plug (it looks like two
>stereo plugs in one shell).  I know the pinouts: Sleeves = earpiece, rings
>= PTT and tips = microphone. PTT and earpiece are working but I haven't
>been able to get mic audio from the headset.  I've tried the typical
>Electret circuit (5VDC through a 2k2 resistor) but no audio.  Any chance
>the mic is a dynamic mic?

The mic is most likely an electret.  Pretty much every Plantronics headset that I've touched over the past many years has used electret mics.

Question: did you try swapping the polarity of the mic connections?

dwayne

-- Dwayne Reid   <spam_OUTdwaynerTakeThisOuTspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
http://www.trinity-electronics.com
Custom Electronics Design and Manufacturing

2011\11\29@122046 by John Ferrell

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On 11/28/2011 5:33 PM, Carey Fisher wrote:
> Can anyone tell me how to interface to the microphone of a Plantronics
> Headset that uses the dual, 3 circuit, WECO-type plug (it looks like two
> stereo plugs in one shell).  I know the pinouts: Sleeves = earpiece, rings
> = PTT and tips = microphone. PTT and earpiece are working but I haven't
> been able to get mic audio from the headset.  I've tried the typical
> Electret circuit (5VDC through a 2k2 resistor) but no audio.  Any chance
> the mic is a dynamic mic?
FWIW
I have three Plantronics  headsets.
1- Sold as PC accessory. Electret, good in every way. I adapted it to use with amateur radio equipment.
2- Telephone (old) Accessory, details yet to be investigated.
3- Aviation use. Many years service in General Aviation. Plugs into socket for a carbon mic without any converter. Has the varity of phone plug that is 0.22" diameter.
     No idea what is really in the package... probably not useful for any other application.
Is the plug on yours 0.22 dia?

-- John Ferrell W8CCW
"The man who complains about the way the
ball bounces is likely to be the one who dropped it."


'[EE] Plantronics Headset Interface Help Needed'
2011\12\01@024810 by Carey Fisher
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On Mon, Nov 28, 2011 at 7:40 PM, Dwayne Reid <.....dwaynerKILLspamspam@spam@planet.eon.net> wrote:

> At 03:33 PM 11/28/2011, Carey Fisher wrote:
> >Can anyone tell me how to interface to the microphone of a Plantronics
> >Headset that uses the dual, 3 circuit, WECO-type plug (it looks like two
> >stereo plugs in one shell)....
>
>I've tried the typical
> >Electret circuit (5VDC through a 2k2 resistor) but no audio.  Any chance
> >the mic is a dynamic mic?
>
> The mic is most likely an electret.  Pretty much every Plantronics
> headset that I've touched over the past many years has used electret mics..
>
> Question: did you try swapping the polarity of the mic connections?
>
> dwayne
>
> Yes, I tried swapping the plug around but it should work either way since
the plug is symmetrical and non-polarized.  I think I have an issue with
the electret bias supply.  The Plantronics data sheet seems to call for
5VDC thru a 265 ohm resistor whereas I'm using a 2.2k resistor that's
typical for many handheld comm mics.  I'll change the resistor and see what
happens.

> --
>
-- Carey Fisher
Chief Technical Officer
New Communications Solutions, LLC
678-999-3956
careyfisherspamKILLspamncsradio.co

2011\12\01@110711 by Dwayne Reid

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At 12:47 AM 12/1/2011, Carey Fisher wrote:

> > Question: did you try swapping the polarity of the mic connections?
>
> > Yes, I tried swapping the plug around but it should work either way since
>the plug is symmetrical and non-polarized.  I think I have an issue with
>the electret bias supply.  The Plantronics data sheet seems to call for
>5VDC thru a 265 ohm resistor whereas I'm using a 2.2k resistor that's
>typical for many handheld comm mics.  I'll change the resistor and see what
>happens.

Gosh - that's a really high current for an electret mic.  That sounds more like what a carbon mic wants to see.  I wonder if they have an electret-to-carbon interface in that headset.

Just a thought - have you contacted Plantronics yet?  I needed to modify one particular model of their phones and they were extremely helpful in sending schematic diagrams for that unit.  I lucked out - this was a phone that they had designed themselves as opposed to many of the units that they sell that were designed and manufactured by a third party - and that Plantronics has zero documentation for.

It can take a while to work your way through to the right person - Plantronics is a large organization spread over several facilities.  But the lady whom I first spoke with promised that she would have the right person return my call - which happened a few days later.

For what its worth, I used to be a radio station broadcast technician (they used to call us broadcast engineers but I know better these days) back in the late '70s.  Plantronics was one of the few telco-type equipment suppliers that we trusted and their technical support was second to none.  I'm truly happy to say that they have maintained that level of support.

So: try giving them a call.

dwayne

-- Dwayne Reid   <.....dwaynerKILLspamspam.....planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
http://www.trinity-electronics.com
Custom Electronics Design and Manufacturing

2011\12\05@112906 by Carey Fisher

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Dwayne,
I agree that that is too much current for the typical electret.  But, the
headset has a SHS1890-15 (amplifier?) between the plug and the actual
headset.  Maybe that's where the current is needed?
I think I'll take your advice and contact Plantronics before I blow up the
customer's headset.

Thanks,
Carey


On Thu, Dec 1, 2011 at 11:07 AM, Dwayne Reid <EraseMEdwaynerspam_OUTspamTakeThisOuTplanet.eon.net> wrote:

{Quote hidden}

>

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