[simpits-tech] An idea - headset boxes

[Roy Coates]

On Mon, 10 May 2004, Joseph Fagner wrote:


I seem to recall that proper aviation headsets require a 5v bias voltage
on the mic circuit. Without that, the mic becomes pretty useless.

Roy.



> John, from what I have read, some civilian headsets work very nicely with
> just a plug conversion, while others do not.  You just have to plug it in
> and find out what it sounds like.  Brian's headset box is really intended
> for those that have poor audio quality with just a plug conversion.  I can't
> recall off hand what the circuit does, but I believe it amplifies or cleans
> up the microphone output, damned if I can't find the file I had on this
> stuff.  Brian sent it to me once before but I can't find it.
>
>
>
> You can get the conversion cable here and many other places like it:
> http://www.spinnerspilotshop.com/cgi-local/SoftCart.exe/scstore/p-pa-88.html
> ?L+scstore+vrks9250ffedf9ed+1084243374
>
> They also sell many other types of cables and pilot supply goodies.  There
> are many sites on the internet like this one.
>
>
>
> Jay
>
>
>
>
>
>   _____
>
> From: simpits-tech-bounces at simpits.org
> [mailto:simpits-tech-bounces at simpits.org] On Behalf Of Inventmd at aol.com
> Sent: Monday, May 10, 2004 8:00 PM
> To: simpits-tech at simpits.org
> Subject: RE: [simpits-tech] An idea - headset boxes
>
>
>
> <<You will need to buy an adapter plug that converts your single military
> U-174 plug to a civilian headset and mic plug. >>
>
> Where do we get these adapters?  I have a mil set of David Clarks I want to
> use for civilian aviation.
>
> I am confused since I find that civilian headsets convert to PC easily with
> a simple radio Shack big mic to little mic adapter.  What does Brian's box
> do?
>
> John
>
> <<NO Steve, these boxes will not convert a military mic to a pc input type.
> They are different impedances.  You will need to buy an adapter plug that
> converts your single military U-174 plug to a civilian headset and mic plug.
> Now you need to be careful to not buy just the adapter, but you must buy the
> adapter that also converts the impedance as well.  The plug adapter alone
> will not work, you MUST convert the impedance as well.  Once you have done
> this, then you build one of Brian's little boxes and this converts the
> civilian plugs to pc plugs.
>
>
>
>
>
>
>
> Where do we get these adapters?  I have a mil set of David Clarks I want to
> use for civilian aviation.
>
>
>
> I am confused since I find that civilian headsets convert to PC easily with
> a simple radio Shack big mic to little mic adapter.  What does Brian's box
> do?
>
> John
>
>
>
>
>