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R.J.O.
 
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Default 2 inputs to headphones?

I use a motorcycle and would like to be able to listen to two audio sources
at once through headphones. The main source would be a standard 'Walkman'
type, the second source is a Dell Axim PDA running a navigation / speed
camera warning system.

The cabling up doesn't seem a problem and I do not feel that either or even
both inputs would be excessive for the earphones. My concern is that the
walkman would feed it's output to the Axim and vice versa. Will this cause
any problems? is anyone aware of anything I can use to prevent the backwards
feeding?

Any help appreciated.

RJO


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Dubious
 
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Default 2 inputs to headphones?

An easier solution, and much safer too, especially
for other road users, is if you get your testosterone
under control and obeyed the laws of the road, then
you'd have no need to worry about speed camera'a etc.


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Dale Farmer
 
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Default 2 inputs to headphones?



"R.J.O." wrote:

I use a motorcycle and would like to be able to listen to two audio sources
at once through headphones. The main source would be a standard 'Walkman'
type, the second source is a Dell Axim PDA running a navigation / speed
camera warning system.

The cabling up doesn't seem a problem and I do not feel that either or even
both inputs would be excessive for the earphones. My concern is that the
walkman would feed it's output to the Axim and vice versa. Will this cause
any problems? is anyone aware of anything I can use to prevent the backwards
feeding?

Any help appreciated.

RJO


Go to your local motorcycle shop. Such systems are out there, and are
not cheap. Friend of mine has one that allows him to talk on three different
radios, and listen to the computer, CD player/radio, etc.

--Dale


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Barry Mann
 
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Default 2 inputs to headphones?

In , on 09/23/03
at 07:39 PM, "R.J.O." said:

I use a motorcycle and would like to be able to listen to two audio
sources at once through headphones. The main source would be a
standard 'Walkman' type, the second source is a Dell Axim PDA running
a navigation / speed camera warning system.


The cabling up doesn't seem a problem and I do not feel that either or
even both inputs would be excessive for the earphones. My concern is
that the walkman would feed it's output to the Axim and vice versa.
Will this cause any problems? is anyone aware of anything I can use to
prevent the backwards feeding?


More than likely, just wiring the two units in parallel will work just
fine -- it depends on each units design -- some designs won't like
that.

A safer way of doing the job is to insert a 150 Ohm resistor in series
with each headphone jack before you join the outputs. The down side of
this approach will be a decrease in volume. If you have volume to
spare, this will not be a problem.

A more robust solution would be to employ a mixer/amplifier that will
combine both units and amplify them a bit. This is quite a bit more
expensive, but it will allow you some extra headroom over the road
noise. (Possibly causing an earlier demise of your hearing.)

-----------------------------------------------------------
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comcast
 
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Default 2 inputs to headphones?


"Barry Mann" wrote in message
om...
In , on 09/23/03
at 07:39 PM, "R.J.O." said:

I use a motorcycle and would like to be able to listen to two audio
sources at once through headphones. The main source would be a
standard 'Walkman' type, the second source is a Dell Axim PDA running
a navigation / speed camera warning system.



I used a 6-channel mixer back in the '80s. Of course I had a police scanner
along with my TV and VCR...I had it rigged to squelch the tunes when
something came on certain channels.

Ended up having to get a bigger battery for the bike. Had an awesome time
working on that system.

-chirs




  #6   Report Post  
Richard Kuschel
 
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Default 2 inputs to headphones?


I use a motorcycle and would like to be able to listen to two audio sources
at once through headphones. The main source would be a standard 'Walkman'
type, the second source is a Dell Axim PDA running a navigation / speed
camera warning system.

The cabling up doesn't seem a problem and I do not feel that either or even
both inputs would be excessive for the earphones. My concern is that the
walkman would feed it's output to the Axim and vice versa. Will this cause
any problems? is anyone aware of anything I can use to prevent the backwards
feeding?

Any help appreciated.

RJO

Shopuld be able to do this with a couple of small transformers in a combining
network.
Richard H. Kuschel
"I canna change the law of physics."-----Scotty
  #7   Report Post  
Owain
 
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Default 2 inputs to headphones?

"R.J.O." wrote
I use a motorcycle and would like to be able to listen to two audio sources
at once through headphones. The main source would be a standard 'Walkman'
type, the second source is a Dell Axim PDA running a navigation / speed
camera warning system.
The cabling up doesn't seem a problem and I do not feel that either or even
both inputs would be excessive for the earphones. My concern is that the
walkman would feed it's output to the Axim and vice versa. Will this cause
any problems? is anyone aware of anything I can use to prevent the backwards
feeding?


You could feed the (left, or right, or sum l+r for mono) walkman into
the left ear and the (left, or right, or sum l+r for mono) PDA into
the right ear. You'd lose stereo audio, but it may easier to
understand the navigation instructions if they come in a different ear
from the music. AIUI this split feed is used in aircraft for
separating crew and radio comms.

This would mean the two equipments grounds would be common but not the
signal wires.

Owain
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