Finding HeadPhone Jack Y-Adapter One Way

[robertkjr3d]

I need a one way standard size stereo headphone jack male y-adapter that outputs 2 stereo female stereo headphone jacks. Full-range no loss in frequency... well as reasonably possible. But also One-way... no feedback.

I have one, but I'm noticing that I'm getting noise from one interconnection through to the other connection, so that it is not one-way on the one I'm using. I was trying to maybe even find a multi box, but couldn't find that either... didn't need to be just a y-adapter or bi adapter... could have been to 4 or more... however also would get expensive I suppose.

I also don't know where the interference is coming from but that is a different issue and question, and a different wire, but if isolated properly by having a one-way direction y-adapter or multi splitting than it should be fine for this exercise.... or it could even be that they are hitting each other in ground looping because of not being isolated.

 

[j_garcia]

I have never heard of a "one way" headphone interconnect, but I would think that just getting a straight Y adapter vs a Y cable would work, and they seem to be more common these days vs Y cables:

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=090-303

It could be a bad jack on the side of whatever you are plugging into that is causing the interference, and if it happens with different cables, that would seem to be more likely.

 

[markw]

Headphone "Y" connectors allow two headphones to be driven simultaneously from a single source so each leg should get the same signal.

What "feedback" or "interference" are you talking about?

 

[robertkjr3d]

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=090-303

the problem with this one... is this one would allow signals to run both ways... I have this one already, or something very close. One way connections allow the signal connection only to go in one direction. I was even looking up the possibility of getting one that split with a db gain or something, but didn't want any change in signal or any frequency range to be dropped.

 

[robertkjr3d]

What "feedback" or "interference" are you talking about?

The whole story, oh boy how much coffee do you have? The audio comes out of my computer... then it gets split standard jack male to 2 female outs the object I want to replace possibly y-adapter one goes to a receiver in the bedroom that is close to the computer split into right and left RCA.... the other goes into a 75ft long wire that goes to the living room... but interference seems to be coming through that wire back to the bedroom speakers... along the other end of the split thus I want to isolate the splitter.... one-way connections. it is expensive to replace anything with the 75-foot wire.. so don't plan to do much with that. and plan to live with the interference out there... and it as explained before the interference also maybe caused by the lack of isolation anyway. It some sort of ground loop... that I've tried diagnosing... and tried and tried and tried.

 

[j_garcia]

you can't isolate on one side, you will have no connection if you do. The cable is basically already a one way deal; there should be no feedback, however you can most likely get cross-talk between the two devices that are connected, and also the voltage of a headphone output is so low that I can't believe that it would survive a 75 foot run, it is far too low that I wouldn't expect it to make it without issues.

 

[robertkjr3d]

you missed the real point... I used the words headphone jack... it's not actually a headphone output I'm using... see the other reply.

 

[robertkjr3d]

actually... perhaps I need to clarify the earlier email

there is a receiver on both ends.
The computer of course has a female jack 3.5mm stereo out. I plug a adapter which is Stereo Male Y-Adapter to Two Female 3.5mm jacks. One of these has a wire plugged into it which goes to right and left rca directly into a close stereo receiver...

The same concept is on the other side except it is 75feet long... a 3.5mm male plugged into the other end of the original split split into Left and Right RCA for 75 feet... then it goes into a Ground loop Isolator... into a receiver in the living room.

If I turn off all the inputs... and turn up the volumes there is a lot of static too much. which comes back through the spilt wire. Which is why I was interested in something that is one directional.

 

[markw]

Sounds like that 75 foot run is picking up noise...

...and, due to the fact that both legs are tied together at the computer, the noise is being shared between the two units. That noise is now being amplified by the receivers.

Something tells me that your 75 ohm run isn't making use of shielded cable.

You might be better off converting the signal coming out of the computer into pairs of RCA jacks that use shielded cables and, even then, 75 feet might be pushing it.

 

[j_garcia]

There could be any number of issues here, not the least of which is the 75ft run. A 3.5mm jack (a headphone jack) will generally be an output with a low voltage. An RCA input expects a voltage that is a few volts, so combine a lower voltage signal and a long cable run, and you are not going to get great results. If the cable run is also parallel to any power wires, whether shielded or not, it could pick up noise. As mentioned, the noise in that line is going to be amplified by both amps. Since the Y is connected to both sides, you are likely getting feedback from one amp to the other, as you should NOT connect two amplifiers together from one source this way - at the very least a switch box of some type would be better.

Do you have noise if you disconnect one or the other of the connections? If so, is it only the longer run?

 

[robertkjr3d]

Something tells me that your 75 ohm run isn't making use of shielded cable.
RCA jacks that use shielded cables

75ohm?... not 75ohm it is 75ft of shielded Right-left audio RCA cable. It also has a Video line that I didn't mention. One end Composite... one end S-Video. For the s-video I was able to find a one-way signal booster...kinda like what I'm looking for on the audio, but cannot find.

 

[robertkjr3d]

noise only comes from the long run... nothing on the short.

I use my computer as a DVR you see... also my ITunes plays to my living room. The sound is awesome, but I'm obsessive. The noise I speak of is minimal, and only noticible when you turn up the volume loud and the input volume is off, or is not playing loud enough. The feedback to the other room is noticible if I turn its volume up and nothing is being sent from the computer to its input... but still the issues are minimal.

How would you set up a receiver system to receive an input video and audio from a computer more than 50 feet away from the living room?

 

[robertkjr3d]

I diagrammed out this idea of moving the Ground-loop-isolator to the other-end of the wiring system. This saved I estimate about 10% of the noise I was getting for some reason... So I believe this is what I needed on this thread.

When I was at radio-shack they had for too expensive what I was looking for too... a 4-way splitter S-Video RCA Left-Right which of course would be one-directional. However it was $50... and my wife was with me, so I wasn't going to buy it.... but that it about exactly what I'm looking for... no it isn't the headphone jack like I started the discussion, but I can convert to which happens anyway before the 75ft run. This 4-way split also plugs in and boosts...

 

[robertkjr3d]

yes I saw one of these at Radio shack when I was there the other day x-cept it was S-video perfect for my needs... and it plugged in for a bit of a boost for my long wire. My problem is that it was $50 and my wife was with me...lol

 

[Rickster71]

... and it as explained before the interference also maybe caused by the lack of isolation anyway. It some sort of ground loop... that I've tried diagnosing... and tried and tried and tried.

robertkjr
You're getting good advice from markw and j garcia.

I'd like to add a quick way for you to rule out the possibility of a ground loop.

Get an extension cord, one that long enough to reach between your PC and two receivers.
The point is to get these three devices plugged into the power strip, and therefore they will be utilizing the same ground.
With this done, listen for your noise problem. If it goes away, you had a ground loop.

Do you have a cable modem on your PC?

Check that, and we'll take it from there. Good Luck.

 

[Midcow2]

Isolation of two speakers from one source

You can make a very inexpensive simple DIODE isolation circuit.

 

[markw]

Huh?

You can make a very inexpensive simple DIODE isolation circuit.

Care to explain what this is supposed to be doing, or is this simply meant to be a joke.

 

[Midcow2]

Not a Joke

Care to explain what this is supposed to be doing, or is this simply meant to be a joke.

Not a joke and sorry you or someone else didn't like my post. All speakers have a postive and a negative post. with a diode you can allow current to flow only one way and effectvily isolate two speaker circuits

this circuit will allow the two speakers to be connected to a headphone jack and be completely isolated from each other. That is what OP asked.

 

[markw]

Whatever you say.

Not a joke and sorry you or someone else didn't like my post. All speakers have a postive and a negative post. with a diode you can allow current to flow only one way and effectvily isolate two speaker circuits

this circuit will allow the two speakers to be connected to a headphone jack and be completely isolated from each other. That is what OP asked.

But I must seriously question your knowledge of electronics after this.

 

[Midcow2]

Better solution - Isolation transformers

But I must seriously question your knowledge of electronics after this.

The output of an amplifier has a DC reference therefore there is a positive and negative polarity. However, since the speaker is strictly a coil it is not polarity conscious except for the phasing part of the alternating frequency of voice, musical instruments etc. so a didode isolation would only address the DC component and not the AC component.

On reason for isolation is to achieve Common Mode Rejection This is the ability of a device to reject any signal that is common to both of its input terminals with reference to the output circuit. The most common case is where a signal source is connected to a different power source to that of the load.

Get this part for an Audio isolation transformer. http://www.electronicplus.com/prodSearch.asp?prod_search=LM25-10&Submit=Search


Connect the secondary outputs from one to the other. Then connect the primary of one of them to the speaker output and the other primary to the speaker or filter. These transformers have multiple taps for both primary and secondary. As long as you are consistent and use the same taps on each, there should be no problem,

PEACE MidCow2