Hi
     I hope that the adapters I bought from radio shack will have the right 
components built in. Now, I am worried.

God bless,
Mark
Jesus Is Lord!
Pendleton Redeemer
http://pendletonepiscopal.org/
----- Original Message ----- 
From: "Martin McCormick" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, April 05, 2010 6:08 AM
Subject: Re: OT Stereo to mono head phones adapter


> Mark writes:
>>      I need to locate an adapter that takes both speakers of a head set =
>> jack and combines them in to a single "mono" out put for a head set. I =
>> need this for a person who can only hear in one ear. Any help would be =
>> appreciated.
>
> This sounds very simple at first but don't go too fast.
> A lot of Y adaptors just connect the left and right channels
> together which is okay if you are feeding one output to two
> inputs but if you connect the left and right channels together
> from a pair of amplifiers, each channel will see the other
> channel as a rather heavy load. if there are different signals
> on the two channels. What you are actually wanting is a
> two-channel passive mixer which would combine the two outputs in
> to one.
>
> You can do this by connecting a series resistor from
> each channel to a single junction which will be the hot side of
> the mono headphone.
>
> The value of the resistors should be aproximately that
> of each headphone. When you connect the resistors together, the
> output level will be down about 3 DB so one may need to turn the
> volume up a bit, but the series resistors will protect each
> amplifier output stage from being melted by unusual loads.
>
> Martin McCormick WB5AGZ  Stillwater, OK
> Systems Engineer
> OSU Information Technology Department Telecommunications Services Group