vB Easy Archive - Pop-port stereo output / AD-15,HS-3 pinout

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Pop-port stereo output / AD-15,HS-3 pinout
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Posted by: super_paws

Does anyone know the pinout to get stereo sound from the pop-port connector? I know pins 11-14 have output for each channel but it does not produce stereo. I suppose there is a circuit in the AD-15, HS-3, etc headsets which applies enough voltage to the right channel. When directly plugged into pins 11-14, the right channel is really faint which makes me believe there needs to be another connection. Any help would be great..thanks.

Posted by: scrub50187

I would also like to know what the pins are..... how come no one has done a wiring schematic on those headsets to see exaclty how they are wired up, and which wire goes to which pin. They make a little pop-port adapter that goes to a 2.5mm plug, but it is just mono, the only way to get stereo is by knowing which wires go to the different pins.

Posted by: Dishe

If you searched, you'd find a million threads about this, concluding that the pop port does not produce stereo with just the wiring.

The AD-15 and HS-3 (and other nokia genuine "stereo" adaptors) have some circuit board that allows the outpout to be stereo. As far as I know, no one here has been able to determine what that circuit actually does, but without it, the output is always mono. No matter what.

Some people think there is some kind of encoding going on that the circuit board needs to de-code, I'm wondering if the board tells the phone to output stereo vs. mono (if its a mono headset, the phone could save amp power and only output one channel). Whatever the case may be, that's why there's no schematic out there. Reverse engineering circuit boards is not something anyone here wants to do... especially when the real thing is less than $10 on ebay.

Posted by: scrub50187

Yes I know that, but has anyone looked at the circuit???? Is there a couple of resistors and a IC chip there or what???? Or is it a couple of jumper wires??? I have found that pins 1 and 2 (or 2 and 3 if you count the pin by the charging port) together work as a ground for the headphones, has anyone else tried playing with that part??

Posted by: Dishe

Quote:

Originally Posted by scrub50187

Yes I know that, but has anyone looked at the circuit???? Is there a couple of resistors and a IC chip there or what???? Or is it a couple of jumper wires??? I have found that pins 1 and 2 (or 2 and 3 if you count the pin by the charging port) together work as a ground for the headphones, has anyone else tried playing with that part??

I would recommend buying a cable for a few bucks and finding out. I don't think anyone who did this spent the time to dissect the circuit board.

There are pictures of it floating around wherever you see a tutorial dealing with modifying the headset to a 3.5mm stereo jack. May not be able to get a real good look, but its there.

I personally don't have one, I'm still debating whether I want to modify an HS-3, or just buy an AD-15.

Posted by: super_paws

I will be taking my HS-3 apart and try to reproduce the circuit if it's not proprietary to Nokia into my 3.5mm adaptor..i'll post the results after

Posted by: scrub50187

I am going to get one off of ebay and try to copy the circuit so that maybe I can squeeze everything into one of those realy small handsfree adapters that you plug in any handsfree headset too. This way it isn't so bulky, and it will be a very clean part. You can even get a pair of stereo headphones that have a mic. built into it and use those, like the headphones for the Rokr. I just need a good close up of that board and the pinout wiring of it. I truly thing the board probrably just makes the wires into jumpers for certain pinouts, or maybe a couple of diodes, but I have searched everywhere and I can't find a good picture of one.

Posted by: Dishe

Quote:

Originally Posted by scrub50187

I am going to get one off of ebay and try to copy the circuit so that maybe I can squeeze everything into one of those realy small handsfree adapters that you plug in any handsfree headset too. This way it isn't so bulky, and it will be a very clean part. You can even get a pair of stereo headphones that have a mic. built into it and use those, like the headphones for the Rokr. I just need a good close up of that board and the pinout wiring of it. I truly thing the board probrably just makes the wires into jumpers for certain pinouts, or maybe a couple of diodes, but I have searched everywhere and I can't find a good picture of one.

I like this idea. All the mods I've seen are far too bulky and carry too much slack in wires.
Plus, the 2.5mm handsfree jacks makes so much sense since there are so many stereo headsets with mic available, not to mention how easy it is to plug in a 2.5 to 3.5mm adaptor (I have a ton of them lying around from my ipaq 1900 series days).

This sounds like a complicated task however, and many have said before that they will try to do something similar to this, only to drop it soon afterwards.

Super_paws, how's your project coming along?

Posted by: scrub50187

I am new to these forums...... my phone was one thing I never needed to mess with, until my MP3/video player died, I write firmwares for these little things so this project is gonna be a breeze once I get my HS-3 in. Then i was like, Hey my 6620 plays MP3's I will just go to Best Buy and pick me up a adapter.......FvvckING MONO PIECE OF $h1t!!!!!!!! Needless to say I was pissed, so I searched the forums only to find people taking HS-3's and putting a mini-stereo jack on them. This circuit can not be that complicated. I can't wait to get mine in so I can rip it apart and make one out of the small pop-port jack. Those other things are way to bulky and I like the idea of still having a microphone if I needed it, as well as the ability to use regular headphones. I will first try to recreate the circuit with the 2.5mm plug, then IF I get that working I might make some that go straight to a mini-stereo jack, for the people who just want to listen to MP3's and are not worried about answering their phone with the headphones on............maybe a really small mic inside the adapter.......but there will never be enough room for that I am afraid. but getting the size down is my main goal.

Posted by: Dishe

Quote:

Originally Posted by scrub50187

I am new to these forums...... my phone was one thing I never needed to mess with, until my MP3/video player died, I write firmwares for these little things so this project is gonna be a breeze once I get my HS-3 in. Then i was like, Hey my 6620 plays MP3's I will just go to Best Buy and pick me up a adapter.......FvvckING MONO PIECE OF $h1t!!!!!!!! Needless to say I was pissed, so I searched the forums only to find people taking HS-3's and putting a mini-stereo jack on them. This circuit can not be that complicated. I can't wait to get mine in so I can rip it apart and make one out of the small pop-port jack. Those other things are way to bulky and I like the idea of still having a microphone if I needed it, as well as the ability to use regular headphones. I will first try to recreate the circuit with the 2.5mm plug, then IF I get that working I might make some that go straight to a mini-stereo jack, for the people who just want to listen to MP3's and are not worried about answering their phone with the headphones on............maybe a really small mic inside the adapter.......but there will never be enough room for that I am afraid. but getting the size down is my main goal.

Cool, when are you getting it?
and what do you mean you write firmwares for these little things?

What was the adaptor from best buy? It wasn't a real nokia part, right?

Posted by: scrub50187

I write/modify firmwares for MP4/MP3 players. I also tweek the video converting programs to do what I want them to do. Ya the little plug is from bestbuy, that is where I am going to try and sqeeze everything into. Hopefully I don't have to make a PCB for it. It wouldn't be cost effective if I did. I sent the paypal payment off a few days ago, so I am sure I will get it sometime next week........I will be on spring break so I might not be here when it gets in. As soon as I get it though, it will only be a matter of minutes and I will have the wiring figured out. All the photos I have seen are of ones that people open up the circuit board.....what about the plug?????? If there is a jumper wire, it will be in there. My 6620 has like 3 grounds that it can play music from, one of them is 2 pins put together. So I am thinking it is a matter of jumping some pins together......but I maybe wrong.

http://scrub50187.com

Posted by: super_paws

So i've taken the HS-23 apart and it seems like ports 11-14 are fully enabled for stereo. It has something to do with pins 1-3 and I'm working on that as of now.

Posted by: Dishe

cool info... keep us posted

Posted by: magichunter

Hi!

I have taken my hds-3 apart. I have finally completed the circuit diagram and I'll be posting it later. I have removed L1, L2, V0 and R0 in attempt to recreate the circuit. However I wasn't successful and now I know why. I lost L2 but I managed to solder back the other components, still working as new. I removed the ic and plug it to the phone,it was not detected. I soldered it back, detected and still function as stereo headset however I notice that when I press the button, fm stations or mp3 switch a little slower. I think the primary use of the ic is to give the appropriate pulse signal for switching. But still, I can not understand how the headset is detected as stereo.

Posted by: scrub50187

what are the numbers on the IC chip and the manufacturer.

Posted by: magichunter

I don't know the manufacturer, it says 55A0 7A on the top side and 3G13 10 on the underside of the ic.

Posted by: super_paws

I'm not sure but I don't think the IC is for the stereo. I think it's the other components that do it because in mono mode, it's not actually mono; the right side is just really really soft. From what I found, the IC controls the 4 buttons. magichunter, please send me your diagram when you're complete so I could compare and verify if that's ok with you.

Posted by: magichunter

Quote:

Originally Posted by scrub50187

what are the numbers on the IC chip and the manufacturer.

No manufacturer, 55A0 7A on top and 3G13 10 on the bottom.

Posted by: magichunter

Here it is:
http://www.pbase.com/magichunter/inbox

I have also disconnected VDD yet hds-3 is still detected as stereo. I have cut the line (open) connecting V1 and R0, this time the headset was detected as mono. I cut the line connecting R0 and IC, headset was not detected.

Posted by: super_paws

Have you tried to see if it works without the IC and just shorting the wires that were on the IC?

Posted by: magichunter

Yes, i shorted the pins on the upper left of the chip, enhancement not supported.

Posted by: Dishe

Told ya so.

I'm pretty sure that's why no one else has recreated this yet. The only option, I suppose, is to take that chip out and try to transplant it into something better looking (read: smaller) than the average adaptors.

Posted by: super_paws

It's perfectly possible with a working circuit diagram. The componenets are very small and would fit in the pop-port connector I have and most others.

Posted by: Dishe

Quote:

Originally Posted by super_paws

It's perfectly possible with a working circuit diagram. The componenets are very small and would fit in the pop-port connector I have and most others.

Really? Can you try it?
I'd be all over it if its possible...

Posted by: Dishe

Any updates?
C'mon guys, it sounds like we're so close!

I recall seeing something once on the forum about a similar project someone did (I think the name was vanilla8), and was selling them. At the time I wasn't interested in stereo, so I didn't pay attention. I'm surprised no one else seems to be contributing, especially since this used to be a hot topic when pop port phones started supporting stereo.

Posted by: super_paws

I've tried putting it together but no luck. The closest I've gotten is getting the phone to recognize it as a stereo headset but still no stereo output. What we really need is someone willing to take apart their AD-15 which has no buttons and will hopefully have a simplier circuit.

Posted by: jimboha

Quote:

Originally Posted by super_paws

The closest I've gotten is getting the phone to recognize it as a stereo headset but still no stereo output. What we really need is someone willing to take apart their AD-15 which has no buttons and will hopefully have a simplier circuit.

Sorry, I don't have an AD-15. I'm trying to get my 'cheap' HDS-3 to work which doesn't have any circuit board... I know I could buy one that does, but I like the challenge.

Can you indicate on your schematic where the headphones and the rest of the pop-port connections are? That IC can't be doing much - 5 total connections: two are ground, one is VDD, one is button switch. That leaves only one for detecting the stereo or not headphones.

Does the upper left pin of IC to Data oudtput any type of signal?

Do any of the other IC pins connect to pop-port pins?

Thank you.

Jim

Posted by: archish

I have done the 3.5mm jack mod but it dosent sound exactly like stereo as the channel seperation is poor. Can anyone help?
http://img290.imageshack.us/img290/7369/pop1wl.jpg

In the headset unit the board has +R -R +L -L
I have made the -R and -L as one and given to the ground of the female jack. the +R and +L are given to the remaining two pins in the jack. The sound is ok but when I play the songs the stereo seperation is not there. I checked with one left channel file and it sounded slightly on the right channel so the stereo seperation is not there. Anyone have idea why its so?

Posted by: Dishe

First of all, what mod are you referring to? The now famous HDS-3 mod, or the one being discussed in this thread?
If you look at the other threads discussing the headset to 3.5mm mod, you'll see that this is a common result. You didn't do anything wrong, for some reason the channels aren't EXACTLY seperated. I don't know why that is.

Posted by: aw614

apparently this thread this custom popport does stereo, and its small
http://www.howardforums.com/showthr...ght=nokia+3+5mm

Posted by: archish

Quote:

Originally Posted by Dishe

First of all, what mod are you referring to? The now famous HDS-3 mod, or the one being discussed in this thread?
If you look at the other threads discussing the headset to 3.5mm mod, you'll see that this is a common result. You didn't do anything wrong, for some reason the channels aren't EXACTLY seperated. I don't know why that is.

famous HDS-3 mod Dishe.

Posted by: mohrds

Quote:

Originally Posted by archish

famous HDS-3 mod Dishe.

When I did my mod, I used only the L- from the HDS-3 to the common on the 3.5mm jack. The stereo seperation is better, but not 100% when listening to test mp3s.

Posted by: JIZATA

The outputs nokia phones have are 4 bridged amplifiers powering 2 high resistance headphones. that's why you can conect them to grounded speakers and have no diference in the signals you get. As for the stereo recognition there is something mystic in the ic that works even with every other pins disconected. in the moment you conect the handsfree you get a verry dim beep on the recognition pin. i tried replacing the ic with 1,05v zenner diode, but the phone still recognises the handsfree as mono (nokia 9300 handsfree hs23)
I suspect there is somekind of signal generator working only on the applied by the ground and signal pin voltage. The same way the mic and the center button work on the simpler models. I will try to make it work with the original headphones. If i sucseed i will post you the shematics

And remember: DO NOT SHORT THE OUTPUT PINS. Grounding or conecting them to eachother them may result damage in the amplifiers and that costs alot!!!

Posted by: Dishe

Wow, I forgot about this thread. I've totally moved on to phones that have more standardized music interfaces.
Nokia was great, but I couldn't deal with propietary hardware. Standards are key...

Posted by: JIZATA

Sorry, i read your blog.
Seems you moved on and a lot.
Well i wos wondering how can i get skype for my Nokia 9300 and i will take your proposal. Also bluetooth headsets wont replace the wire. They may have certain advantiges but every encodind that music goes trough makes it worse. Still prefer the simple amplifier-cable-speaker mode

I have tryed some cool mods to make wireles spakers ( i used infrared beam than lazer torch because i coudnt make the infrared version work in distances over 15 meters ) and got prety good results without any encoding beeng done. Still i think wireles stuff will soon replace the exsiting one but..... it will have to get its power from somewhere

so it won't be exacly wireles