In Car issue: Turning up subwoofer resets tablet USB port - Nexus 7 (2013) Q&A

I have a strange issue after installed my Nexus 7 as a car stereo setup in my Subaru (see setup blow)... Whenever I turn up the volume, specifically the subwoofer, the USB system basically "resets" itself. As if, I unplugged and plugged it back in very quickly. At first, I thought my USB DAC was bad, because I plugged my audio feed directly into the tablet with no USB devices connected and all worked fine, but if I have my hub plugged in and then the reset happens (with audio from tablet still), the reset still happens and my OBD2 adapter (USB) brings up torque. I plugged that same USB DAC directly in, with no hub, to my OTG cable and used its audio feed, same issue. I thought maybe the voltage drop was too harsh and causing issues with my charger, so I ran a 120v usb charger setup (like a factory phone one) with an extension cord to my vehicle to isolate its own charge system to the tablet with the same results. OK, Maybe it is just vibration? (forgot to note: subwoofer is freeair, laying in the back seat... still testing, box isn't done yet, so the vibration level is next to nothing currently.) I grabbed my usb cable system with the volume low and shook the life out of it... never did the reset. Again, only when the subwoofer volume goes up and anything is plugged into the USB port on the OTG for external devices does this ever happen.
The Setup:
I have a dedicated 4A 12v-5v charger and it seems to charge the tablet fine. I have a 90 degree charge adapter in place. I also have an OTG Cable so I can hook up USB to my dedicated USB hub that I have a "backup" power cable plugged in (into the same 5v charger the tablet is).
Audio chain wise, I have plugged into my USB hub a USB DAC. After that, a noise blocker. From there, I wired in a potentiometer for volume control. From there, it goes to the 4 channel amp and the mono subwoofer amp (which also has a dedicated volume controller that came with the amp)
Power wise, I have a dedicated run of "oversized 4awg" (basically, 6 awg wire) from under the hood and no more than 5' of cable to a fused distribution block, then to the amps. I also have a ground wire of the same size that from come the battery ground that all amps connect to (as well as chassis, so about an overkill of a grounding system). The factory wiring harness was spliced into for connection to a relay that feed from the constant on factory wire, feeding the 5v usb charger and the remote turn on trigger for the 2 amps (so it shouldn't be overloaded at all).
Items (can't give links, so giving exact item name):
4A 12v-5v charger(Amazon - Icstation LM2596 DC to DC Voltage Regulator Dual USB Charger Step Down Power Supply Buck Converter 6-40V to 5V 3A DC 5.5X2.1mm Port )
90 Degree USB adapter(Amazon - Micro USB Extension Cable - Riipoo Left Angle Micro B USB Extension Cable, 25 CM, Micro USB 5 Pin Male to Female, Sync Charging and Data Transferring Cable for Samsung, HTC, Huawei, Sony and More)
OTG Cable (Amazon - DSYJ Micro USB Host OTG Cable with Micro USB Power for Samsung S7 S7 Edge, S6 S6+ S6 Edge, S5, S4 & Nexus 10 9 7 4 Player + ALL OTHERS )
USB Hub (Amazon - UNITEK Portable USB 3.0 4-Port Ultra Slim Data hub, with Micro USB 2.0 Power port and Built-in USB 3.0 Cable LED for iMac, MacBook, MacBook Pro, MacBook Air, Mac Mini, Chrombook, Surface Pro )
USB Dac (Amazon - Fiio K1 Portable Headphone Amplifier&DAC and USB DAC, Titanium)
Noise Blocker (Amazon - Mpow Ground Loop Noise Isolator for Car Audio / Home Stereo System with 3.5mm Audio Cable (Black))
Potentiometer: (Amazon - 10K Audio Taper Stereo Potentiometer 1/4 Shaft)
4 Channel Amp: (Amazon - Audiopipe 4 Channel Micro Amplifier 1000 Watts)
Subwoofer Amp: (Amazon - Audiopipe Class D Micro Amplifier 500 Watts)
I'm pretty stumped at this point. Any ideas?

Wiring can be a *****!
You could replace your right angle cable and OTG with this one item: https://www.amazon.com/gp/product/B00NSBVNCM/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
My USB3 hub works pretty good. but it's not at rock solid as the USB2 hub it replaced. Hubs can do some weird things when they don't initialize when the tablet want or thinks they should.
How does the subwoofer volume knob connect?
Does the the same happen when you turn the other "volume knob"?
How are the 2 amps connected to the DAC?
I'd guess offhand the DAC doesn't like whatever "feedback" it's getting through the noise suppressor from the potentometer.
What's the reason for it? You should be able to adjust your system volume through the tablet, especially if the sub amp has it's own gain.

fr4nk1yn,
-Just ordered that OTG cable. Was going to try and make my own, but if that one is proven, good enough for me.
-Agreed on hub, but I did try going direct to OTG cable, bypassing hub, and had the same issue.
-Subwoofer volume knob has its own RJ-11 phone cable to the amp. I took it apart, its using only 2 wires out of the 6 to the potentiometer inside, so pretty simple. Not sure how it works at the amp itself, but standard subwoofer volume knob on an amp, far as I can tell.
-Other knob can be cranked, seems fine, but more testing would need to be done. Soon as subwoofer knob is cranked with the volume know all the way up (or close), it triggers really quick.
-Does Dac > Potiometer > Amps (soldered wiring together, 4 channel amp has 2 specific connectors and sub has pair of RCA)
-Potentiometer gives a much better feel, very response in comparison. Having to find a volume "knob" on a tablet requires vision, taking away from the driving experience (and safety!). Don't like if the tablet has ANY delay in that control as well. I'm just old school, I guess.
Thanks for the help!

Related

split micro usb socket in 2

Hi,
I have just bought the galaxy nexus and am wondering if any of you bright bods could think of a way to do this. I have a Fiat bravo with blue and me so use the usb port for media playback, however this does not supply enough power to keep the phone charging if using navigation too. I also have a 750mA 12 volt charger. Is there a cable that would allow me to have both the media player cable connected and the cigarette lighter cable connected at the same time, preferably with d- d+ shorted so that high speed charging would be available as the effective power available should be 1.2A if my thinking is correct

Infuse 4g/ Galaxy SIII Vehicle Dock Charging Question

So I am planning on getting the Infuse dock for my S3. I want to hard-wire it in my truck so it is a clean install and wires are not everywhere. My options that I see right now are to splice in a cig lighter socket to the current one or the head unit power and then just plug in the car charger to that and run the wire behind the dash up to the mount.
I am assuming the power adapter that gets plugged into the cig lighter steps the power down from the 12v+ to the 3 or 4v to charge the phone correct? Or is this built into the part of the actual dock/mount that slides into the phone? If this is built into the dock/mount I could just run a wire straight down to the fuse panel and wire it in there without having to use a cig socket and adapter.
And another quick question....if I got a new head unit with a rear USB port I could just run a longer USB cable from the dock behind the dash to the rear input. Assuming this provides power, I could charge, use MTP, and stream pandora correct? Would this also replace Bluetooth hands free calling? I guess it would just be simple to pop the phone in the dock and have all those features and not have to worry about turning Bluetooth on and off and pairing. Plus I would assume audio quality would be better via a wired connection rather than Bluetooth.
Anyone?
Sent from my SCH-I535 using xda app-developers app
The dock needs a micro usb connection, which is 5 volts. You have lots of options, from just plugging a micro usb car charger into the dock and lighter socket, to opening up that car charger and wiring direct to fuse box, to wiring a new lighter socket under the dash to the fuse box then getting the little adapter that looks like a rocket that plugs into a lighter socket and gives you a usb port. Combine that with a micro usb cable and poof. I did this last setup and it works great...

mod notes on the XOOM (original) standard & speaker docks

plenty of people have modded the original XOOM docks for USB host, such as here.. and here...
i also dissected the standard and speaker docks this past week, just wanted to share my observations:
standard dock:
- uses a regular charger and just passes through the ~12v to the dock charging pins
- the micro USB connection uses 200k ohms between the ID pin and ground to signal the tablet that it's in a dock
- the audio adapter circuitry (which provides the line-out) connects via the micro USB port and is powered completely via that port (not via the external charger connection)
speaker dock:
- uses a separate charger that comes with the dock, rated at 19v and 1.58 amps. the extra power is likely needed to drive the amp for the speakers
- the internal circuitry steps the voltage down only to ~13.3 volts for the tablet charging pins. interesting that they didn't need to be more precise, i guess the tablet's own internal regulators can accept a bit of a range (not just 12v)
- the micro USB ID pin to ground connection is at 200k ohms just like in the standard dock
- the audio adapter is connected via the micro USB just like in the standard dock.
- the HDMI port is completely a pass-through to the external plug on the dock, it provides no functionality to the dock circuitry
i converted the standard dock's microUSB connector to a USB OTG cable for a carputer project. of course by doing this i lost the audio adapter functionality. so i then tried to convert the audio adapter into a regular USB accessory and hook it up via the OTG cable and a powered hub (to enable me to get USB host AND still use the audio adapter). this didn't work and i'm really not sure why. it just wasn't seen at all (nothing new in the dmesg output). i at least expected to see an unrecognized accessory from dmesg if nothing else.

Power in to GTab and USB out cable....

Is there such a thing for the GTab? I'm using mine to play audio with the GalaTab USB audio out mod, and it's a battery killer. Is there a cable that will let me connect the tab to the external charger and also allow USB digital out to the DAC at the same time? There are a number of cables out there, but none of them seem to supply power the tablet itself.
Thanks

Note 10 Dex on Atrix Lapdock ( didn't want to hijeack the other HP Elite X3 topic )

Here's to let everyone know that dex on the Note 10 works with the old Atrix lapdock very well
In case anyone has one lying around and wants to see it in action, you would want the following accessories:
1. USB-C to HDMI adapter ( I opted for 1 with HDMI, USB 3.0 & USB-C in for power )
2. micro HDMI to HDMI cable
3. Female micro HDMI to Female micro HDMI adapter
Optional:
1. Modified USB A to micro USB cable ( more on this later )
2. Female micro USB to Female micro USB adapter
3. USB Cable + Charger to charge your phone
If all you want is to bring up dex on your lapdock, all you need are the HDMI connectors. You will want to use a Bluetooth keyboard & mouse to navigate dex and will not be able to charge your phone.
Going 1 step further, you can use a multi-function USB-C adapter with HDMI, USB OTG & USB in for power.
Here, you would modify a usb cable to give you access to the lapdock keyboard & mousepad. The lapdock was designed to be an all-in-one setup with the Atrix phone, so the 10 hour battery could also charge the Atrix. <-- That's our problem. So you will need to snip the RED wire in the usb cable to prevent the lapdock from potentially frying your phone or other devices.
Theoretically, you can charge the phone using the 2 usb ports on the back of the lapdock, but it's a trickle effect. It'll take forever and you won't be happy. I did it in a pinch & running any applications under dex still consumed my phone's battery. Plugging it into a charger, though, kept my phone @ 100%.
A big caveat here is the mousepad is NOT multitouch, so I still used my bluetooth mouse for the scroll wheel.
Here's where this becomes a lot of fun... the lapdock screen is great for running emulators in a decent window. I plugged in my shield gamepad with a usb cable into the back of my lapdock and was able to play pretty much anything I wanted to. Still plugged into an outlet kept the phone @ 100% while emulating 100%+ speeds.
The larger screen is also very nice for streaming tv/movies.
There is an option in the Dex control panel to output audio through the HDMI cable, so you aren't relying on your phone for audio.
Anyway, if you have one of these gems lying around, it's a great way to extend the value of this phone.
ycavan said:
Here's to let everyone know that dex on the Note 10 works with the old Atrix lapdock very well
In case anyone has one lying around and wants to see it in action, you would want the following accessories:
1. USB-C to HDMI adapter ( I opted for 1 with HDMI, USB 3.0 & USB-C in for power )
2. micro HDMI to HDMI cable
3. Female micro HDMI to Female micro HDMI adapter
Optional:
1. Modified USB A to micro USB cable ( more on this later )
2. Female micro USB to Female micro USB adapter
3. USB Cable + Charger to charge your phone
If all you want is to bring up dex on your lapdock, all you need are the HDMI connectors. You will want to use a Bluetooth keyboard & mouse to navigate dex and will not be able to charge your phone.
Going 1 step further, you can use a multi-function USB-C adapter with HDMI, USB OTG & USB in for power.
Here, you would modify a usb cable to give you access to the lapdock keyboard & mousepad. The lapdock was designed to be an all-in-one setup with the Atrix phone, so the 10 hour battery could also charge the Atrix. <-- That's our problem. So you will need to snip the RED wire in the usb cable to prevent the lapdock from potentially frying your phone or other devices.
Theoretically, you can charge the phone using the 2 usb ports on the back of the lapdock, but it's a trickle effect. It'll take forever and you won't be happy. I did it in a pinch & running any applications under dex still consumed my phone's battery. Plugging it into a charger, though, kept my phone @ 100%.
A big caveat here is the mousepad is NOT multitouch, so I still used my bluetooth mouse for the scroll wheel.
Here's where this becomes a lot of fun... the lapdock screen is great for running emulators in a decent window. I plugged in my shield gamepad with a usb cable into the back of my lapdock and was able to play pretty much anything I wanted to. Still plugged into an outlet kept the phone @ 100% while emulating 100%+ speeds.
The larger screen is also very nice for streaming tv/movies.
There is an option in the Dex control panel to output audio through the HDMI cable, so you aren't relying on your phone for audio.
Anyway, if you have one of these gems lying around, it's a great way to extend the value of this phone.
Click to expand...
Click to collapse
Annoyingly I have a Atrix lapdock but I'm not confident about the rewiring so found a good discounted HP Elite X3 lapdock. Only if someone sold the full cable and adaptor package on eBay for the Atrix
haha, it sounds more complicated than it actually is
just remember that the RED cable in the micro usb cables is power, so that's the only one that needs cutting. What I did was:
1. cut the usb cable in half
2. strip a little bit of the non-RED cables and twisted them together.
3. use electrical tape to cover each of the re-attached cables.
4. pull the red leads back onto the black sheathe
5. use electrical tape to go over the junction between the 2 halves of the cable.
All of the other components are things that are easy to order online, Amazon.
ycavan said:
haha, it sounds more complicated than it actually is
just remember that the RED cable in the micro usb cables is power, so that's the only one that needs cutting. What I did was:
1. cut the usb cable in half
2. strip a little bit of the non-RED cables and twisted them together.
3. use electrical tape to cover each of the re-attached cables.
4. pull the red leads back onto the black sheathe
5. use electrical tape to go over the junction between the 2 halves of the cable.
All of the other components are things that are easy to order online, Amazon.
Click to expand...
Click to collapse
Okay I'll order cables and have a go!
Please confirm the 3rd item in your list is a micro hdmi female to micro hdmi female as elsewhere I have seen micro female to standard female. Thanks
jah said:
Okay I'll order cables and have a go!
Please confirm the 3rd item in your list is a micro hdmi female to micro hdmi female as elsewhere I have seen micro female to standard female. Thanks
Click to expand...
Click to collapse
Yes, I use a micro hdmi female to female adapter for my micro hdmi male to normal hdmi male cable.
Suggestion
My take on these DeX apps is straightforward: they’re not great. If you just use them for simple tasks like texting, copying and pasting small bits of text, or dragging and dropping a file or two, it’s fine. Pushing any harder than that is likely to be a recipe for sorrow, however, as things tend to get laggy pretty quickly. I think that’s more the fault of the desktop software than the phone’s hardware, but regardless, it’s slightly disappointing.
I don’t think that’s a reason to avoid buying the Note 10, which is still an excellent phone. But the experience did get me thinking: why did I and so many others have the objectively irrational hope that DeX would unlock new ways of interacting with your phone?
I think it’s because the idea of making a sole computer sits right next to flying cars in the “this is what the future will be” section of our collective unconsciousness.
alexhalessays said:
My take on these DeX apps is straightforward: they’re not great. If you just use them for simple tasks like texting, copying and pasting small bits of text, or dragging and dropping a file or two, it’s fine. Pushing any harder than that is likely to be a recipe for sorrow, however, as things tend to get laggy pretty quickly. I think that’s more the fault of the desktop software than the phone’s hardware, but regardless, it’s slightly disappointing.
I don’t think that’s a reason to avoid buying the Note 10, which is still an excellent phone. But the experience did get me thinking: why did I and so many others have the objectively irrational hope that DeX would unlock new ways of interacting with your phone?
I think it’s because the idea of making a sole computer sits right next to flying cars in the “this is what the future will be” section of our collective unconsciousness.
Click to expand...
Click to collapse
Also if you can run DeX well on a lapdock, you may not need a Samsung Tab S6!.
alexhalessays said:
My take on these DeX apps is straightforward: they’re not great. If you just use them for simple tasks like texting, copying and pasting small bits of text, or dragging and dropping a file or two, it’s fine. Pushing any harder than that is likely to be a recipe for sorrow, however, as things tend to get laggy pretty quickly. I think that’s more the fault of the desktop software than the phone’s hardware, but regardless, it’s slightly disappointing.
I don’t think that’s a reason to avoid buying the Note 10, which is still an excellent phone. But the experience did get me thinking: why did I and so many others have the objectively irrational hope that DeX would unlock new ways of interacting with your phone?
I think it’s because the idea of making a sole computer sits right next to flying cars in the “this is what the future will be” section of our collective unconsciousness.
Click to expand...
Click to collapse
I use DeX with my lapdock instead of my "real" laptop a lot of the time. My emails are on my phone, contacts are on my phone, pretty much all of the gaming apps I use are on my phone. The only time I ever really need my laptop is to play high end games that aren't ported to Android. Now, if only LoD would come out for the note10... :/
Does the Note 10 support the old 1366x768 resolution on the Atrix Lapdock? I remember getting it going on my Note 8 and it's not a supported resolution leading to really unusable low-res blocky everything on the screen.
bchliu said:
Does the Note 10 support the old 1366x768 resolution on the Atrix Lapdock? I remember getting it going on my Note 8 and it's not a supported resolution leading to really unusable low-res blocky everything on the screen.
Click to expand...
Click to collapse
Yup.
Okay, managed to get my old Motorola Atrix working with my Note 10+. Took a different route to the one described above as the female to female couplers are not easy to source. So I used the Rasberry PI cables for the Atrix and my Samsung Note 8 Dex hub, which was free with the Note 8. But I have to use a BT mouse. Otherwise a good solution. But I would recommend the HP Elite X3 lapdock instead if there is not much a price difference on eBay.
ycavan said:
Here's to let everyone know that dex on the Note 10 works with the old Atrix lapdock very well
In case anyone has one lying around and wants to see it in action, you would want the following accessories:
1. USB-C to HDMI adapter ( I opted for 1 with HDMI, USB 3.0 & USB-C in for power )
2. micro HDMI to HDMI cable
3. Female micro HDMI to Female micro HDMI adapter
Optional:
1. Modified USB A to micro USB cable ( more on this later )
2. Female micro USB to Female micro USB adapter
3. USB Cable + Charger to charge your phone
If all you want is to bring up dex on your lapdock, all you need are the HDMI connectors. You will want to use a Bluetooth keyboard & mouse to navigate dex and will not be able to charge your phone.
Going 1 step further, you can use a multi-function USB-C adapter with HDMI, USB OTG & USB in for power.
Here, you would modify a usb cable to give you access to the lapdock keyboard & mousepad. The lapdock was designed to be an all-in-one setup with the Atrix phone, so the 10 hour battery could also charge the Atrix. <-- That's our problem. So you will need to snip the RED wire in the usb cable to prevent the lapdock from potentially frying your phone or other devices.
Theoretically, you can charge the phone using the 2 usb ports on the back of the lapdock, but it's a trickle effect. It'll take forever and you won't be happy. I did it in a pinch & running any applications under dex still consumed my phone's battery. Plugging it into a charger, though, kept my phone @ 100%.
A big caveat here is the mousepad is NOT multitouch, so I still used my bluetooth mouse for the scroll wheel.
Here's where this becomes a lot of fun... the lapdock screen is great for running emulators in a decent window. I plugged in my shield gamepad with a usb cable into the back of my lapdock and was able to play pretty much anything I wanted to. Still plugged into an outlet kept the phone @ 100% while emulating 100%+ speeds.
The larger screen is also very nice for streaming tv/movies.
There is an option in the Dex control panel to output audio through the HDMI cable, so you aren't relying on your phone for audio.
Anyway, if you have one of these gems lying around, it's a great way to extend the value of this phone.
[/QUOT
ycavan said:
Here's to let everyone know that dex on the Note 10 works with the old Atrix lapdock very well
In case anyone has one lying around and wants to see it in action, you would want the following accessories:
1. USB-C to HDMI adapter ( I opted for 1 with HDMI, USB 3.0 & USB-C in for power )
2. micro HDMI to HDMI cable
3. Female micro HDMI to Female micro HDMI adapter
Optional:
1. Modified USB A to micro USB cable ( more on this later )
2. Female micro USB to Female micro USB adapter
3. USB Cable + Charger to charge your phone
If all you want is to bring up dex on your lapdock, all you need are the HDMI connectors. You will want to use a Bluetooth keyboard & mouse to navigate dex and will not be able to charge your phone.
Going 1 step further, you can use a multi-function USB-C adapter with HDMI, USB OTG & USB in for power.
Here, you would modify a usb cable to give you access to the lapdock keyboard & mousepad. The lapdock was designed to be an all-in-one setup with the Atrix phone, so the 10 hour battery could also charge the Atrix. <-- That's our problem. So you will need to snip the RED wire in the usb cable to prevent the lapdock from potentially frying your phone or other devices.
Theoretically, you can charge the phone using the 2 usb ports on the back of the lapdock, but it's a trickle effect. It'll take forever and you won't be happy. I did it in a pinch & running any applications under dex still consumed my phone's battery. Plugging it into a charger, though, kept my phone @ 100%.
A big caveat here is the mousepad is NOT multitouch, so I still used my bluetooth mouse for the scroll wheel.
Here's where this becomes a lot of fun... the lapdock screen is great for running emulators in a decent window. I plugged in my shield gamepad with a usb cable into the back of my lapdock and was able to play pretty much anything I wanted to. Still plugged into an outlet kept the phone @ 100% while emulating 100%+ speeds.
The larger screen is also very nice for streaming tv/movies.
There is an option in the Dex control panel to output audio through the HDMI cable, so you aren't relying on your phone for audio.
Anyway, if you have one of these gems lying around, it's a great way to extend the value of this phone.
Click to expand...
Click to collapse
Hi, I'm trying to do the same. I've got a Note 10+ hooked up to my old Atrix lapdock. Note goes to a multiport adapter. From the adapter's USB-A output, I ran a cable to the lapdock's micro-USB. From the adapter's HDMI out, I ran a cable to the lapdock's mini-HDMI. With that, I can use the lapdock's screen but no keyboard or trackpad.
I ran a cable from the adapter's USB-C to one of the lapdock's rear USB ports, after snipping the red wire, but still no kb/m. The phone does charge like this though.
What have I done wrong? TIA.
Click to expand...
Click to collapse
The USB cable going to the micro-USB port on the lapdock needs to have the red cable snipped. What I did was to snip the red cable and pull both snipped ends back, then use a bit of electrical tape to cover that part of the wire so the snipped ends don't accidentally touch anything.
The USB cable(s) going to the rear of the lapdock are fine unmodified.
Dude/Dudette thank you so much!!! It's only because I came across your thread here that I decided to try and resurrect my trusty old lapdock, and now it works perfectly!
Thanks for replying so quickly. I modified the wrong cable - snipped the red wire on the USB cable running to the rear USB-A port. Doh!
ycavan said:
The USB cable going to the micro-USB port on the lapdock needs to have the red cable snipped. What I did was to snip the red cable and pull both snipped ends back, then use a bit of electrical tape to cover that part of the wire so the snipped ends don't accidentally touch anything.
The USB cable(s) going to the rear of the lapdock are fine unmodified.
Click to expand...
Click to collapse

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