yes, the pc130's get a small amount of dc voltage from the center ring of
the microphone in jack on the sound card.
I think pretty much all PC's have always had this, so your typical pc
microphone is an electric condenser style microphone element.
Not too much cutting and splicing would be necesary if things are designed
from scratch.
73
Colin, V A6BKX
----- Original Message ----- 
From: "Ken" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, June 04, 2007 9:09 AM
Subject: Re: headsets for ht's


> Colin, I think this is a great idea if you can come up with something
that's convenient to use.  I bought a pair of cheap FRS radios
> that came with an ear bud and little in-line mic and tiny ptt.  The FRS
radios are Cobra and the external speaker/mic work with the
> T90.  I thought of adapting this to work with a better headset but it
would take some major cutting and splicing.
>
> Do your PC-130's get power from the PC?  I'm not sure the mic would need
power, but you would need to add a ptt and of course the
> headphones would need to be wired in parallel   so you could hear the
audio in both ears.
>
> I would really like to try a headset on my V7.  My design would use an
external box with a built-in ptt.  The audio would come from
> the two speaker outputs on the back.  I prefer binaural audio so I would
mix the audio in the box and the audio level for each band
> could still be controlled from the radio.  Now imagine this, the external
box will be an old gutted out mouse.  Maybe the three
> mouse buttons could be used as PF keys.  The ptt would be in the place of
the mouse ball (no wise cracks now <g>) and you would
> transmit by letting the weight of your hand depress the ptt, or you could
have a thumb operated ptt on the side.  You might be able
> to use a Y adapter connected to the mic modular connection so that the
headset/controller could be in parallel with the hand mic.
>
> 73, Ken -N5SWR
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Colin McDonald
> Sent: Sunday, June 03, 2007 9:12 PM
> To: [log in to unmask]
> Subject: headsets for ht's
>
>
> Something i have thought of doing is using a good quality PC headset, such
> as the one i have, senheiser pc130, and using it on the ic t90a.
> I would have to built a small power pack to supply voltage to the
microphone
> cartridge in the headset, but as far as i can tell, the impedance match
> should be very close.
> I wonder what the collective opinions are regarding this kind of setup are
> on the list?
> I suspect the microphone cartridge wouldn't have enough output to drive
the
> radio's mike amp, but perhaps an extra tripple A battery or extra watch
> battery in the power pack would solve that issue.
> I could likely use 1.5V watch batteries, since the headset microphone
> shouldn't require much current to operate for long periods of time, and it
> really only requires 1.6V or so to work.  So, a pair of small batteries in
> series should supply around 3V, plenty of voltage to keep the mike hot.
>
> 73
> Colin, V A6BKX
>
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