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Bought a Y-cable



 
 
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  #16  
Old August 25th 20, 04:51 AM posted to alt.comp.os.windows-10
Micky
external usenet poster
 
Posts: 1,528
Default Bought a Y-cable

In alt.comp.os.windows-10, on Mon, 24 Aug 2020 14:24:23 +0200, "Carlos
E.R." wrote:

On 24/08/2020 06.26, micky wrote:
In alt.comp.os.windows-10, on Sat, 08 Aug 2020 21:13:51 -0400, micky
wrote:

In alt.comp.os.windows-10, on Sat, 08 Aug 2020 20:53:51 -0400, Paul
wrote:

micky wrote:
Now that I sometimes have the laptop and desktop running at the same
time, and I listen to web radio from whichever is doing a better job, I
wanted a Y-connector, to send both signals to the speakers.

There appeared to be many but most just split off the mic from
headphones. Another was 8 feet long but the part where the wires could
go in 2 directions to two sources was not shown. It definitely wasn't
all 8 feet. Another was only 20 cm long. I don't know what that is
in real numbers but I dont' think it will work, especially if the
computers were on opposite sides of even the same desk.

One was 6 feet long with totally separate wires. 6 feet is more than
enough but I think this means 12 feet. I have the url if you want.

But this last one had a warning, given liteally 3 times in the Amazon
webpage offering it for sale:
"Don't play two different audio at the same time. If the audio from
two different audio sources, more powerful output will be louder."

Well of course, and so what, and won't anyone notice this right away?

Is there a valid reason for this warning?

A foreigner teaching you some maths ?

That might be it. When the Chinese warn you that one sound might be
louder than another, that's enough to make me think MS might insist on a
password even when I'm alone.

The person neglected to consider if the signals
are identical, but one signal is upside-down with respect
to the other signal. The net signal output is zero :-)

PC#1 ----- R1 ------+
|
+---------- In, computer speakers, 10K input impedance
|
PC#2 ----- R2 ------+

You're allowed to make your own cables, you know.



So the resistors are meant to solve the problem that Carlos brought up??
Burning out one of the sound outputs.


It is not that easy.

It the resistors are high value, you hear nothing. If they are low, the
outputs are still in danger. Plus, there is the issue of impedance coupling.

I repeat: just don't do that.


Yes, but it's so much easier to buy.


This answer was when I thought I coudl just buy it.

For R1 and R2, you could make then both 390 ohms
or both 560 ohms, without too much impact on the results.


Carlos, you raised the problem more clearly to this newbie than Paul
did.

Do you agree that 300 or 560 ohm reistors oin the positive wires of the
Y-connector would keep the sound output from burning out?


It would render the speakers silent as well...



Okay, I won't do it. I trust you, even though I've never met you.
Having two computers running will probably be temporary anyhow, as
planned. I sort of like it but when I have one good computer, I won't
want to waste the elecfricity.

Ads
  #18  
Old August 25th 20, 11:05 AM posted to alt.comp.os.windows-10
Carlos E.R.[_3_]
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Posts: 1,356
Default Bought a Y-cable

On 25/08/2020 05.54, micky wrote:
In alt.comp.os.windows-10, on Mon, 24 Aug 2020 12:11:29 -0500,
NT (Ant) wrote:

I use an analog 3.5mm Y splitter from my HDTV and PC to my Logitech
Z-2300 speakers (2.1 setup). However, I noticed when my HDTV is on, its
right speaker's volume is lowered from my PC's audio.


I may just buy a switch. I should clean up my desk and make more room.

I also have a KVM switch that is buried on the desk, since the 2nd big
computer failed. I'll dig that out.


I was going to suggest a switch.

One caveat: be careful to not operate the switch while there is sound.
Some output circuits heavily dislike this and burn. I learned this the
costly way.


We bought a powerful amplifier, nominally for home use, but hey, you can
not put 250 watts in the sitting room and survive it. So we used it for
a small cinema-club theatre. We didn't have money to buy a professional
sound system.

We also bought a switch box that allowed us to switch on/off pairs of
speakers in the room, to adjust to the amount of people, while
maintaining the impedance.

Well, it worked for a while, then an internal fuse blew. We repaired it
on warranty, but they warned us that we were not "home use". Well, 150
watts is 150 watts, no, who cares where it is used? They told us to turn
the volume full down when operating the switches.


--
Cheers, Carlos.
  #19  
Old August 25th 20, 01:15 PM posted to alt.comp.os.windows-10
Chris Elvidge[_3_]
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Posts: 15
Default Bought a Y-cable

On 25/08/2020 11:05 am, Carlos E.R. wrote:
I was going to suggest a switch.


Make sure you get one of the break-before-make variety.


--

Chris Elvidge, England
  #20  
Old September 3rd 20, 02:44 AM posted to alt.comp.os.windows-10
Monty
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Posts: 598
Default Bought a Y-cable

On Sat, 08 Aug 2020 19:55:13 -0400, micky
wrote:


There appeared to be many but most just split off the mic from
headphones. Another was 8 feet long but the part where the wires could
go in 2 directions to two sources was not shown. It definitely wasn't
all 8 feet. Another was only 20 cm long. I don't know what that is
in real numbers


( In real numbers it is still 20 cm. ))

There is a fairly useful calculator and converter in Windows 10 that
might be useful to you.

It has 5 calculator functions and 8 converter functions.

It is accessible in a number of ways; perhaps the easiest is to hold
down the 'Win' key and press 'X'.

Now click on 'Command Prompt'. When the Command Prompt panel appears
type 'calc' and then press the Enter key.

When the Calculator panel appears, you can click on the three bars in
the top left corner and from the functions list choose the function
you want.

Good luck,
 




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