3.5m male to male to connect two computers/phones

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arykov

Member
Joined 2020
#1
I am connecting a laptop(Thinkpad T480) to Thinkpad T430 or an Android phone so that one's audio output becomes another one's input and vice versa. Both jacks are TRRS CTIA (not apple). Mono would do. I assume I just need to buy something like this Audio cord, cut and resolder wires. Any idea what to what? I assume there are some more or less standard colors there.

Or else I would need to buy two trrs barrel connectors and wire them up. Right?

The purpose of this weirdness is to be able to call into voice conversations that happen on T480 using skype, teams, etc. So one would either call an android phone(auto pickup) connected to T480 or some VOIP phone number that T430 automatically responds to. Do you think this is workable? Or latency/quality will kill this?

Thanks,
Alex.
 
#3
Thanks. Exactly what I needed. So I guess I would wire microphone(white/sleeve/terminal 4) of one to left(blue/tip/terminal 1) and right(red/ring 1/terminal 2) of the other with ground(black/ring 2/terminal 3) on both.
 
#6
Just assembled using these and receive nothing but noise.
Click to expand...

Play a sound file on the player PC say 90% volume.
Open Audacity or similar software on the other PC.
Check if You can record.

Bear in mind in order to hear the recording on the recording PC You have to activate "listen to this device" somewhere in the sound settings control panel, but that leads usually to feedback, so check the playback levels.

Many combo connectors need to be told what was plugged in:
Click to expand...
Realtek chipsets are known for this behavior.

Found This:
The combo audio jack does not support a conventional microphone.
Click to expand...
From the product page, I don't know what this means...

And This:

The 3.5mm jack port of a T430 can output and receive audio. But:

If it detects something like: cable]=|=|> (normal cable), outputs audio but doesn't act as microphone or line-in.

If it detects: cable]=|=|=|> (present in earphones with mic for smartphones), outputs audio but also records the microphone inserted in the middle of the cable.

But what if I want to exclusively record the audio from a microphone or a radio? The computer tries to send audio to the microphone when it shouldn't.
You could perhaps cheat the jack by placing two 32 ohm resistors in place of the headphones.

... and more ...

You may try to do the following:

- in Realtek HD audio manager click "Device advanced settings" link in the top right corner

- make sure you have "multi-stream" mode selected
 
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#8
I was able to do this simple test. Consider separating the inputs and outputs to check if each one work separately.

I have a Dell laptop with a realtek chip and a single connector. It has worked with a headset before, so it is 3 terminal + ground.

For this test, I used a simple stereo cable , so 2 terminal + ground.

I plugged one end into a phone that was playing music. Music switched from internal speakers to the cable. Then I plugged other end into the laptop. The box came up and I selected line - in .

Then I recorded with "Voice Recorder" . This worked. I had to almost max out the playback volume in the phone and in the computer to record and listen at reasonable levels.
 
#10
bajjisw said:
I was able to do this simple test. Consider separating the inputs and outputs to check if each one work separately.

I have a Dell laptop with a realtek chip and a single connector. It has worked with a headset before, so it is 3 terminal + ground.

For this test, I used a simple stereo cable , so 2 terminal + ground.

I plugged one end into a phone that was playing music. Music switched from internal speakers to the cable. Then I plugged other end into the laptop. The box came up and I selected line - in .

Then I recorded with "Voice Recorder" . This worked. I had to almost max out the playback volume in the phone and in the computer to record and listen at reasonable levels.
Click to expand...

Hmm, I don't get any popups that allow me to change in/out designations of jack terminals(I do remember being asked in the past on other computers what did you just plug in?). I wonder if it is a simple software misconfiguration or audio chipset limitation. I don't seem to be able to figure out what chipset I have.
 
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#12
Solved the problem of getting two computers "talking" to each other with a pair of USB adapters, that have two trs jacks - one for mic and one for head phones. It would be good to understand why this works and the other one does not.
The most likely explanation of why my original solution did not work is here: Build a Line Level to Microphone Adapter - Record from your Phone to Computer or Camera - YouTube
But that does not explain why solution with two USB adapters works. Does it mean, that they mislabeled mic in jack and it should be marked line in instead? Or are those devices "smart enough" to be able to accept both?
 
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