Stereo to 2-channel mono question

J

JK

Guest
I posted this last week in sci.electronics.design but got no responses.
Probably it's too basic. Anyway...

I'd like to make a small male/female patch-cord that would passively
mix-down stereo headphone output to two-channel mono.

Assuming typical MP3 player drive levels, is this circuit OK?


Plug > -- to -- > Jack
~~~~ ~~~~
Left __[R1]___.__.__ Left
Right __[R2]___| |__ Right
Common _______________ Common

R1 = R2 = 1000 ohms


Thanks for any advice!

..
 
On Tue, 9 Aug 2011, Tom Biasi wrote:

"JK" wrote in message news:1122113.2111@mail.invalid...

I'd like to make a small male/female patch-cord that would passively
mix-down stereo headphone output to two-channel mono.

Assuming typical MP3 player drive levels, is this circuit OK?


Plug > -- to -- > Jack
~~~~ ~~~~
Left __[R1]___.__.__ Left
Right __[R2]___| |__ Right
Common _______________ Common

R1 = R2 = 1000 ohms


What do you mean by "two-channel mono"?
It may be me but I don't know what you want to do.
Click to expand...
I want to plug one end of the patch-cord into an MP3 player and then
plug earphones into the other end of the patch-cord. Then, at *each*
ear-piece I'd like to have an L+R mono signal.

..
 
"JK" wrote in message news:1122113.2111@mail.invalid...

I posted this last week in sci.electronics.design but got no responses.
Probably it's too basic. Anyway...

I'd like to make a small male/female patch-cord that would passively
mix-down stereo headphone output to two-channel mono.

Assuming typical MP3 player drive levels, is this circuit OK?


Plug > -- to -- > Jack
~~~~ ~~~~
Left __[R1]___.__.__ Left
Right __[R2]___| |__ Right
Common _______________ Common

R1 = R2 = 1000 ohms


Thanks for any advice!

What do you mean by "two-channel mono"?
It may be me but I don't know what you want to do.

Tom


..
 
On Tue, 09 Aug 2011 13:25:11 -0500, JK wrote:

I posted this last week in sci.electronics.design but got no responses.
Probably it's too basic. Anyway...

I'd like to make a small male/female patch-cord that would passively
mix-down stereo headphone output to two-channel mono.

Assuming typical MP3 player drive levels, is this circuit OK?


Plug > -- to -- > Jack
~~~~ ~~~~
Left __[R1]___.__.__ Left
Right __[R2]___| |__ Right
Common _______________ Common

R1 = R2 = 1000 ohms
Click to expand...
"Two channel mono" == monophonic on a stereo plug?

That should work, as long as the input impedance of the 'mono' device is
high enough.

--
www.wescottdesign.com
 
"JK" <nomail@mail.invalid> wrote in message
news:1122115.1710@mail.invalid...
On Tue, 9 Aug 2011, Tim Wescott wrote:

On Tue, 09 Aug 2011 13:25:11 -0500, JK wrote:

I posted this last week in sci.electronics.design but got no responses.
Probably it's too basic. Anyway...

I'd like to make a small male/female patch-cord that would passively
mix-down stereo headphone output to two-channel mono.

Assuming typical MP3 player drive levels, is this circuit OK?


Plug > -- to -- > Jack
~~~~ ~~~~
Left __[R1]___.__.__ Left
Right __[R2]___| |__ Right
Common _______________ Common

R1 = R2 = 1000 ohms

"Two channel mono" == monophonic on a stereo plug?

Yes - L+R at each output channel.

That should work, as long as the input impedance of the 'mono' device is
high enough.

www.wescottdesign.com

OK. The mono device is just headphones.

My main concern was loading and/or cross-connection of the MP3 player's
output drivers - that's why I picked 1K mixing R.

Thanks for the reply!
Click to expand...
The cheap 'ear bug' sitting on my desk has a resistance of ~ 30 ohms. So
with 1 k's I think you'll need some gain after the mixing. If you wanted to
do it without any post amplification then I think you could pick some
'mixing' R's that match the resistance of the head phones you are using.
You throw away 1/2 the signal that way, but it's simple.

George H.
.
Click to expand...
 
JK wrote:

I posted this last week in sci.electronics.design but got no responses.
Probably it's too basic. Anyway...

I'd like to make a small male/female patch-cord that would passively
mix-down stereo headphone output to two-channel mono.

Why?
Click to expand...

Thanks,
Rich
 
On Tue, 09 Aug 11 13:25:11 EST, JK <nomail@mail.invalid> wrote:

I posted this last week in sci.electronics.design but got no responses.
Probably it's too basic. Anyway...

I'd like to make a small male/female patch-cord that would passively
mix-down stereo headphone output to two-channel mono.

Assuming typical MP3 player drive levels, is this circuit OK?


Plug > -- to -- > Jack
~~~~ ~~~~
Left __[R1]___.__.__ Left
Right __[R2]___| |__ Right
Common _______________ Common

R1 = R2 = 1000 ohms
Click to expand...
Yes. That's how it's done.
 
On Tue, 9 Aug 2011, Tim Wescott wrote:

On Tue, 09 Aug 2011 13:25:11 -0500, JK wrote:

I posted this last week in sci.electronics.design but got no responses.
Probably it's too basic. Anyway...

I'd like to make a small male/female patch-cord that would passively
mix-down stereo headphone output to two-channel mono.

Assuming typical MP3 player drive levels, is this circuit OK?


Plug > -- to -- > Jack
~~~~ ~~~~
Left __[R1]___.__.__ Left
Right __[R2]___| |__ Right
Common _______________ Common

R1 = R2 = 1000 ohms

"Two channel mono" == monophonic on a stereo plug?
Click to expand...
Yes - L+R at each output channel.

That should work, as long as the input impedance of the 'mono' device is
high enough.

www.wescottdesign.com
Click to expand...
OK. The mono device is just headphones.

My main concern was loading and/or cross-connection of the MP3 player's
output drivers - that's why I picked 1K mixing R.

Thanks for the reply!

..
 
JK wrote:

I posted this last week in sci.electronics.design but got no responses.
Probably it's too basic. Anyway...

I'd like to make a small male/female patch-cord that would passively
mix-down stereo headphone output to two-channel mono.

Why?

Thanks,
Rich
Click to expand...
At work, it's better to keep 'one ear open' and since my MP3 player(s)
don't have a stereo/mono select, this seemed like a good work-around.

..
 
JK wrote:
JK wrote:

I posted this last week in sci.electronics.design but got no responses.
Probably it's too basic. Anyway...

I'd like to make a small male/female patch-cord that would passively
mix-down stereo headphone output to two-channel mono.

Why?

At work, it's better to keep 'one ear open' and since my MP3 player(s)
don't have a stereo/mono select, this seemed like a good work-around.

Ah, got it. :)
Click to expand...
Rich
 
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