AeroElectric-List Digest Archive

Fri 12/30/16


Total Messages Posted: 20



Today's Message Index:
----------------------
 
     1. 03:44 AM - Re: USB (rampil)
     2. 04:36 AM - USB (BobbyPaulk@comcast.net)
     3. 05:53 AM - Re: Re: USB (Charlie England)
     4. 06:43 AM - Re: USB ()
     5. 08:26 AM - Re: Securing Split PVC Conduit (ashleysc@broadstripe.net)
     6. 09:19 AM - Re: Re: USB (Eric Page)
     7. 12:00 PM - Re: Re: USB (Jared Yates)
     8. 12:24 PM - Re: Re: USB (Daniel Hooper)
     9. 01:10 PM - Re: Re: USB (Dj Merrill)
    10. 01:48 PM - Re: Re: USB (Daniel Hooper)
    11. 02:48 PM - Re: Re: USB (Dj Merrill)
    12. 03:10 PM - Re: Re: USB (Dj Merrill)
    13. 03:12 PM - Re: Re: USB (Daniel Hooper)
    14. 03:21 PM - Re: Re: USB (Daniel Hooper)
    15. 04:29 PM - Re: Re: USB (Dj Merrill)
    16. 05:00 PM - Re: Re: USB (Daniel Hooper)
    17. 05:36 PM - Re: Re: USB (Jared Yates)
    18. 06:33 PM - Re: Audio Isolation Amplifier Boards (don van santen)
    19. 06:43 PM - Re: Audio Isolation Amplifier Boards (don van santen)
    20. 11:12 PM - Re: Re: USB (Eric Page)
 
 
 


Message 1


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    Time: 03:44:33 AM PST US
    Subject: Re: USB
    From: "rampil" <ira.rampil@gmail.com>
    At least in the Apple world, the resistor network which informs the device to be charged of the charger's capability and compatibility is actually in the charging cord. If I remember the tech specs, the amperage capacity is detected by voltage drop across the resistor. Bottom Line: If you want to charge an iPad or iPhone use a "genuine" Lightning cord. -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=464480#464480


    Message 2


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    Time: 04:36:20 AM PST US
    From: BobbyPaulk@comcast.net
    Subject: USB
    Thank you Bob and Eric for the explanations. Great information for an old geezer. bobby


    Message 3


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    Time: 05:53:53 AM PST US
    From: Charlie England <ceengland7@gmail.com>
    Subject: Re: USB
    On Fri, Dec 30, 2016 at 5:43 AM, rampil <ira.rampil@gmail.com> wrote: > > At least in the Apple world, the resistor network which informs the > device to be charged of the charger's capability and compatibility is > actually in the charging cord. If I remember the tech specs, the amperage > capacity is detected by voltage drop across the resistor. > Bottom Line: If you want to charge an iPad or iPhone use a "genuine" > Lightning cord. > > -------- > Ira N224XS > > > Or, simply stay away from that world.... ;-)


    Message 4


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    Time: 06:43:53 AM PST US
    From: <jim@PoogieBearRanch.com>
    Subject: USB
    Earlier today, someone said that to charge an Apple device, you had to use an Apple lightning coord. That is partially true, in that a cord sourced from Apple WILL work, but there are alternatives - and some are much better than Apple's own lightning cords. The "trick" is to purchase only "Apple MFi Certified" lightning cords. My personal choice for the supplier is Anker - sold through Amazon. They make MFi certified cords (complete with the unique authorization chip like Apple uses) that work beautifully with all Apple devices, are available in multiple lengths (1,3, 6, and 10 feet) and in several colors (red, white, blue, gold, space gray), all for very reasonable prices (much lower than Apple's own flimsy cables). I've never seen the "unapproved charging cable" notice when using an Anker cable. My favorite is the double-braided nylon-sheathed PowerLine+ cables. I use a "space gray" 6-ft version to charge my iPad Mini in flight, so that the cable 'disappears' when laid across my gray glareshield cover. I like the longer cable for this purpose, because my charging port (cigar lighter with an Anker 2-port USB adapter) is on the right side, but mounting the iPad there would interfere with entry/egress, so I have to mount it on the opposite side of the airplane. These double-braided nylon sheathed cables are very durable, far more flexible than standard cables, and they don't seem to tangle as much. They even come with a magnet-closed "cover" to keep the cord neat when not in use. I know it probably seems crazy to be this enthusiastic about such a trivial product, but after spending $20 on "genuine Apple" lightning cables, only to have the ends rip off, or the insulation covers develop holes that lead to kinks and shorts, finding a much-less-expensive alternative that not only works well, but is virtually indestructible just makes my day. I've given many of these cables as "stocking stuffer" gifts to my kids and family, and everyone just loves them. For those of you who use non-Apple devices, Anker also makes standard Micro USB and USB-C cables (with all the same options) for those devices (most Android phones and tablets). They also make a pretty nice 2-port USB adapter for you cigar lighter that will charge two 2.1A devices simultaneously (2 iPads, or 1 iPad and 1 iPhone, as I use). And, just for the record, I don't work for, or have any interest in Anker other than as a very satisfied customer. Jim Parker


    Message 5


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    Time: 08:26:22 AM PST US
    From: ashleysc@broadstripe.net
    Subject: Re: Securing Split PVC Conduit
    Hi Neal and Art; Google "wire ties with mounting holes." Morris Products makes several types. Cheers! Stu. ----- Original Message ----- From: "Neal George" <neal.george@gmail.com> Sent: Tuesday, December 27, 2016 9:11:53 AM Subject: Re: AeroElectric-List: Securing Split PVC Conduit A dab of RTV? Neal George Sent from my iPhone On Dec 26, 2016, at 10:05 PM, Art Zemon < art@zemon.name > wrote: Folks, I am using some split PVC conduit in my plane and two of the runs are pretty close to vertical, about 4 feet long. Sitting in my garage, with the wires not yet secured at the bottom, the conduit keeps trying to slide downward in the 2 inch square channels through which it runs. I think that I ought to secure it somehow and wonder if you have any ideas that will keep it in place. Maybe I can wrap a thin cable tie around it and get it to slip into a groove? Or maybe wrap it with silicone self-sealing tape and the put an AN742 clamp around it? Thanks, -- Art Z. -- https://CheerfulCurmudgeon.com/ "If I am not for myself, who is for me? And if I am only for myself, what am I? And if not now, when?" Hillel


    Message 6


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    Time: 09:19:34 AM PST US
    From: Eric Page <edpav8r@yahoo.com>
    Subject: Re: USB
    There's no way a cord could know the capability of a plug adapter unless the adapter signals it in some way. The device in Apple's charging cords (and, as Jim pointed out, in MiFi Certified cords) is an integrated circuit used for authentication. It still looks for the signaling voltages on D+ and D-, which current Apple plug adapters provide. The plug adapters are still using simple resistor dividers to generate the 2.75V signals. Eric > On Dec 30, 2016, at 3:43 AM, rampil <ira.rampil@gmail.com> wrote: > At least in the Apple world, the resistor network which informs the device to be charged of the charger's capability and compatibility is actually in the charging cord. If I remember the tech specs, the amperage capacity is detected by voltage drop across the resistor. Bottom Line: If you want to charge an iPad or iPhone use a "genuine" Lightning cord. > > -------- > Ira N224XS


    Message 7


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    Time: 12:00:43 PM PST US
    From: Jared Yates <email@jaredyates.com>
    Subject: Re: USB
    Is this contrary to Joe's advice about sensing voltage across the two USB data pins, or in addition to it? On Fri, Dec 30, 2016 at 6:43 AM, rampil <ira.rampil@gmail.com> wrote: > > At least in the Apple world, the resistor network which informs the > device to be charged of the charger's capability and compatibility is > actually in the charging cord. If I remember the tech specs, the amperage > capacity is detected by voltage drop across the resistor. > Bottom Line: If you want to charge an iPad or iPhone use a "genuine" > Lightning cord. > > -------- > Ira N224XS > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=464480#464480 > >


    Message 8


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    Time: 12:24:25 PM PST US
    From: Daniel Hooper <enginerdy@gmail.com>
    Subject: Re: USB
    This is not correct. The charging resistor network is in the charger. However if you use a super-cheap charging cord, the wire gauge may not be large enough. When the iPhone (or whatever) detects the charger voltage drop below a certain voltage (maybe 4.8V?) it will back off until the voltage comes back up. So based on the resistance of the cable, the device may not be able to charge as quickly as it otherwise would. Both pieces have to be in place for an optimal charge time. > On Dec 30, 2016, at 5:43 AM, rampil <ira.rampil@gmail.com> wrote: > > At least in the Apple world, the resistor network which informs the > device to be charged of the charger's capability and compatibility is > actually in the charging cord


    Message 9


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    Time: 01:10:55 PM PST US
    From: Dj Merrill <deej@deej.net>
    Subject: Re: USB
    > On Dec 30, 2016, at 3:23 PM, Daniel Hooper <enginerdy@gmail.com> wrote: > > This is not correct. The charging resistor network is in the charger. > This is not correct. The charging resistor network is in the cord, not the charger. You can take a charger that provides a USB powered port, plug a cord without the resistor network into it, and the Apple device will not charge. Use the same charger with a cord that does have the resistor network, and it will charge fine. The amp rating of the charger does have an effect on the rate of charge, but the resistor network is not in the charger, it is in the cord. -Dj


    Message 10


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    Time: 01:48:46 PM PST US
    From: Daniel Hooper <enginerdy@gmail.com>
    Subject: Re: USB
    Maybe this is what you=99re talking about? http://appleinsider.com/articles/12/09/25/apples_lightning_port_dynamicall y_assigns_pins_to_allow_for_reversible_use <http://appleinsider.com/articles/12/09/25/apples_lightning_port_dynamical ly_assigns_pins_to_allow_for_reversible_use> It=99s a bad idea to use a non-MFI Lightning cable in any case, for this reason. But the D+/D- line bias network that tells the phone how fast it is allowed to charge is DEFINITELY located inside the charger. There are a decent number of standards between the various Apple configurations, newer USB standards, and a Chinese standard, so having an MFI cable for you phone and a Samsung charger is no guarantee of success. There are chips (ICs) made for chargers out there that can (somehow) sense which kind of device is attached and adjust its resistor network to allow the maximum charging for any type, but it is difficult to tell whether this chip was designed into the charger. > On Dec 30, 2016, at 3:09 PM, Dj Merrill <deej@deej.net> wrote: > > > >> On Dec 30, 2016, at 3:23 PM, Daniel Hooper <enginerdy@gmail.com> wrote: >> >> This is not correct. The charging resistor network is in the charger. >> > > This is not correct. The charging resistor network is in the cord, not the charger. > > You can take a charger that provides a USB powered port, plug a cord without the resistor network into it, and the Apple device will not charge. Use the same charger with a cord that does have the resistor network, and it will charge fine. > > The amp rating of the charger does have an effect on the rate of charge, but the resistor network is not in the charger, it is in the cord. > > -Dj > > > > > >


    Message 11


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    Time: 02:48:18 PM PST US
    Subject: Re: USB
    From: Dj Merrill <deej@deej.net>
    On 12/30/2016 4:47 PM, Daniel Hooper wrote: > But the D+/D- line bias network that tells the phone how fast it is > allowed to charge is DEFINITELY located inside the charger. If you buy a cable that is supposed to plug into a USB port, the resistor network is most definitely inside the cable, if for no other reason than your computer USB port (ie, the charger aka power source) is not customized for Apple devices. This is true for both the older style plugs (iphone 4s and earlier for example) and the new lightning connector for the later devices. In addition, the newer lightning connector has other circuitry built into it like the MFi authorization chip. You might be able to buy a charger that has the resistive network built into it, but from what I've seen it is common to put this inside the cable such that the cable can then be used with any charger that offers a USB port. Here is an example of a lightning cable that has it built in: https://www.amazon.com/Anker-PowerLine-Lightning-Certified-Charger/dp/B013JMBAMC/ Here is an example of an older iPhone 4s cable that has it built in: https://www.amazon.com/iPhone-JETech-3-Pack-Certified-Charging/dp/B015V7XB5C/ I haven't seen a charger that has the resistive network built into it, and didn't find one from a quick search on Amazon. Can you offer a link that has this in the charger itself, and not the cable? Thanks, -Dj -- Dj Merrill - N1JOV - EAA Chapter 87 Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/ Glastar Flyer N866RH - http://deej.net/glastar/


    Message 12


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    Time: 03:10:35 PM PST US
    Subject: Re: USB
    From: Dj Merrill <deej@deej.net>
    To make it even more confusing, there are differences in USB 1, 2, and DCP (Dedicated Charging Port) which also have different resistor networks across D+ and D-. However, Apple, in its infinite wisdom (sarcasm) didn't use the standards, thus causing one to have to buy special USB cables to be recognized as one that would actually charge the device, otherwise you get "Charging is not supported with this accessory" or similar message on the iPhone. That special resistor network built into the cables what we are referring to, if that helps to clarify things. -Dj -- Dj Merrill - N1JOV - EAA Chapter 87 Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/ Glastar Flyer N866RH - http://deej.net/glastar/


    Message 13


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    Time: 03:12:34 PM PST US
    From: Daniel Hooper <enginerdy@gmail.com>
    Subject: Re: USB
    If you buy genuine Apple cables they do not have this built in =94 that is a special cable that potentially tells the iPhone that it can draw more current than the charger may be capable of. I suspect those items counterfeit MFI for that reason =94 highly nonstandard. It=99s possible that they have loosened the standards for accessory products, but in my experience they keep the leash pretty taut. The truth is that the resistor network is in EVERY charger that is intended for Apple devices, and some configuration or other (USB charging standard or Chinese charging standard) is present in nearly every other one. Some chargers, as I mentioned before, have a chip that can switch between the standards automatically. Here is the evidence in Ken Sherriff=99s Apple charger teardown: http://www.righto.com/2012/05/apple-iphone-charger-teardown-quality.html <http://www.righto.com/2012/05/apple-iphone-charger-teardown-quality.html> In the schematic he drew from examination, http://static.righto.com/files/charger-schematic.pdf <http://static.righto.com/files/charger-schematic.pdf> you can see the ID network there on page 2 of the schematic, R5, R6, R7, and R9. There are also many reference designs for USB chargers that include these or some similar configuration of resistors. > On Dec 30, 2016, at 4:47 PM, Dj Merrill <deej@deej.net> wrote: > > > On 12/30/2016 4:47 PM, Daniel Hooper wrote: >> But the D+/D- line bias network that tells the phone how fast it is >> allowed to charge is DEFINITELY located inside the charger. > > > If you buy a cable that is supposed to plug into a USB port, the resistor network is most definitely inside the cable, if for no other reason than your computer USB port (ie, the charger aka power source) is not customized for Apple devices. This is true for both the older style plugs (iphone 4s and earlier for example) and the new lightning connector for the later devices. In addition, the newer lightning connector has other circuitry built into it like the MFi authorization chip. > > You might be able to buy a charger that has the resistive network built into it, but from what I've seen it is common to put this inside the cable such that the cable can then be used with any charger that offers a USB port. > > Here is an example of a lightning cable that has it built in: > https://www.amazon.com/Anker-PowerLine-Lightning-Certified-Charger/dp/B013 JMBAMC/ > > Here is an example of an older iPhone 4s cable that has it built in: > https://www.amazon.com/iPhone-JETech-3-Pack-Certified-Charging/dp/B015V7XB 5C/ > > I haven't seen a charger that has the resistive network built into it, and didn't find one from a quick search on Amazon. Can you offer a link that has this in the charger itself, and not the cable? > > Thanks, > > -Dj > > -- > Dj Merrill - N1JOV - EAA Chapter 87 > Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/ > Glastar Flyer N866RH - http://deej.net/glastar/ > > > >


    Message 14


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    Time: 03:21:56 PM PST US
    From: Daniel Hooper <enginerdy@gmail.com>
    Subject: Re: USB
    Read what this guy has to say about it. I haven=99t used his products, so I can=99t vouch for them, but I heard him give a talk at Oshkosh about USB charging and it was right on. These products you have here are what he calls a =9Ccheater cable=9D. He even has an =9Cintelligent charger=9D module that (I believe) has the smart resistor switching IC in it. http://www.commitlift.com/usbchargers.html <http://www.commitlift.com/usbchargers.html> Sidenote: =9CAdaptive Fast Charging=9D that he talks about is a whole different mess. > On Dec 30, 2016, at 4:47 PM, Dj Merrill <deej@deej.net> wrote: > > > On 12/30/2016 4:47 PM, Daniel Hooper wrote: >> But the D+/D- line bias network that tells the phone how fast it is >> allowed to charge is DEFINITELY located inside the charger. > > > If you buy a cable that is supposed to plug into a USB port, the resistor network is most definitely inside the cable, if for no other reason than your computer USB port (ie, the charger aka power source) is not customized for Apple devices. This is true for both the older style plugs (iphone 4s and earlier for example) and the new lightning connector for the later devices. In addition, the newer lightning connector has other circuitry built into it like the MFi authorization chip. > > You might be able to buy a charger that has the resistive network built into it, but from what I've seen it is common to put this inside the cable such that the cable can then be used with any charger that offers a USB port. > > Here is an example of a lightning cable that has it built in: > https://www.amazon.com/Anker-PowerLine-Lightning-Certified-Charger/dp/B013 JMBAMC/ > > Here is an example of an older iPhone 4s cable that has it built in: > https://www.amazon.com/iPhone-JETech-3-Pack-Certified-Charging/dp/B015V7XB 5C/ > > I haven't seen a charger that has the resistive network built into it, and didn't find one from a quick search on Amazon. Can you offer a link that has this in the charger itself, and not the cable? > > Thanks, > > -Dj > > -- > Dj Merrill - N1JOV - EAA Chapter 87 > Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/ > Glastar Flyer N866RH - http://deej.net/glastar/ > > > >


    Message 15


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    Time: 04:29:57 PM PST US
    Subject: Re: USB
    From: Dj Merrill <deej@deej.net>
    On 12/30/2016 6:11 PM, Daniel Hooper wrote: > If you buy genuine Apple cables they do not have this built in My curiosity was piqued so I conducted a couple of experiments. I took a genuine Apple cable that works with my Apple charger for an iPhone 4s, and plugged it into a Windows 7 PC USB port. It seems to work fine, and charges the iPhone 4s without displaying any error messages on the screen. I repeated the same test with an Apple lightning cable and Iphone SE with the same results. If there wasn't anything built into the cable, how did this work properly? Let's find out. This video gives a good explanation of how the Apple protocol works with regards to the resistive network used for the iPhone 4s: https://learn.adafruit.com/minty-boost/icharging?embeds=allow We know that the different USB ports (USB 1, 2, 3, etc) offer different power ratings (https://en.wikipedia.org/wiki/USB). The power rating is identified by using different resistances related to the two data pins, (D+ and D-). It would appear that the iPhone recognizes the standard USB identification resistances, and can therefore use a standard USB port to charge. In addition, Apple has another set of proprietary resistances that identify power ratings that are different than the USB standard, and they use these in their chargers. So, the answer to my question above is that it worked because in all of my test cases there were resistors across the data lines, both in the USB ports and the Apple charger. I stand corrected, and the only explanation is that the resistive network indeed exists within the charger, not the cable. The "cheater cables" you refer to were for using non-Apple chargers, whether wall chargers or the "cigarette lighter" variety that had no resistance across the data lines, and the resistors were added in the cable so the iPhone would work. I actually built one of these cables years ago, and made the incorrect conclusion that the resistive network identifier was in all the cables. -- Dj Merrill - N1JOV - EAA Chapter 87 Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/ Glastar Flyer N866RH - http://deej.net/glastar/


    Message 16


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    Time: 05:00:27 PM PST US
    From: Daniel Hooper <enginerdy@gmail.com>
    Subject: Re: USB
    Thank you for taking the time to understand what is going on here. It=99s fairly complicated and the non-standard hardware that people use to get around all sorts of issues only makes it worse. For what it=99s worth, Apple has been using the line bias resistors since before there was a USB charging standard. There=99s one last point that you=99ve got a little wonky: > On Dec 30, 2016, at 6:28 PM, Dj Merrill <deej@deej.net> wrote: > > It would appear that the iPhone recognizes the standard USB identification resistances Your test by plugging your phone into a computer doesn=99t tell you everything you want to know. Computer ports have a fully digital power-negotiation protocol that is built into the original USB 1.0 standard (up to 500mA). Because of this extra hardware, the computer port does not need charger ID resistors. There are SOME computers that have a type of dedicated charging port that can serve even when the computer is turned off, but this is not a typical setup. In some cases you may get a charging indication with a simple 5V power supply (no USB 2.0 communication, no ID resistors). BUT the phone will only draw around 500mA if it does anything. This is not enough current to keep the battery charged with the screen on, so the battery will slowly run down even though it is indicating a charge. What the ID resistors do is tell the phone =9Chey, go nuts! I=99 ve got 1A (or 2A or 2.1A) for you here!=9D, which will charge the phone with various levels of speed. The real struggle is getting the optimum charging rate out of your charger, no matter what device you have. That=99s the holy grail, and you have to spend a few bucks to get that functionality in a charger. (also assuming you aren=99t using a crappy cable) There=99s no great way to test for this function as a consumer and there=99s no real standard way for manufacturers to communicate that functionality effectively, since so many of the cheap ones lie about what they do.


    Message 17


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    Time: 05:36:09 PM PST US
    From: Jared Yates <email@jaredyates.com>
    Subject: Re: USB
    This has all been really useful discussion, thank you! To take it from the theoretical to the actionable (I'm ready to get out my soldering iron), do we have a specific list of resistors and a schematic to get the appropriate volts on the data pins if we use something like the 5v power supply that Joe linked in the beginning of the discussion? It seems that there's no need for all of us to do the trial and error if we have the same volts coming in and the same device connected to the plug. On Fri, Dec 30, 2016 at 7:59 PM, Daniel Hooper <enginerdy@gmail.com> wrote: > Thank you for taking the time to understand what is going on here. > > It=99s fairly complicated and the non-standard hardware that people use to > get around all sorts of issues only makes it worse. > > For what it=99s worth, Apple has been using the line bias resistors since > before there was a USB charging standard. > > There=99s one last point that you=99ve got a little wonky: > > On Dec 30, 2016, at 6:28 PM, Dj Merrill <deej@deej.net> wrote: > > It would appear that the iPhone recognizes the standard USB identificatio n > resistances > > > Your test by plugging your phone into a computer doesn=99t tell you > everything you want to know. > > Computer ports have a fully digital power-negotiation protocol that is > built into the original USB 1.0 standard (up to 500mA). Because of this > extra hardware, the computer port does not need charger ID resistors. > > There are SOME computers that have a type of dedicated charging port that > can serve even when the computer is turned off, but this is not a typical > setup. > > > In some cases you may get a charging indication with a simple 5V power > supply (no USB 2.0 communication, no ID resistors). BUT the phone will on ly > draw around 500mA if it does anything. This is not enough current to keep > the battery charged with the screen on, so the battery will slowly run do wn > even though it is indicating a charge. > > What the ID resistors do is tell the phone =9Chey, go nuts! I =99ve got 1A (or > 2A or 2.1A) for you here!=9D, which will charge the phone with vari ous levels > of speed. > > The real struggle is getting the optimum charging rate out of your > charger, no matter what device you have. That=99s the holy grail, a nd you > have to spend a few bucks to get that functionality in a charger. (also > assuming you aren=99t using a crappy cable) > > There=99s no great way to test for this function as a consumer and there=99s > no real standard way for manufacturers to communicate that functionality > effectively, since so many of the cheap ones lie about what they do. >


    Message 18


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    Time: 06:33:35 PM PST US
    From: don van santen <donvansanten@gmail.com>
    Subject: Re: Audio Isolation Amplifier Boards
    Bob, Just noticed this. Would this be a good way to connect an xm roady music receiver to my audio panel? Background, The roady has no volume control and is intended to plug into a cassette player using the supplied adapter. I wired it directly to my Garmin audio panel. It worked fine except The volume was lower than needed. I am changing to a PS Engineering PDA 360XR audio panel that has music input volume controls. I am not sure that the new install will have adequate volume. Any ideas on how to increase the volume? On Thu, Dec 8, 2016 at 1:00 PM, Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > I've had a number of folks express and interst in > acquiring the boards to the DIY audio Isolation > amplifier. > > Interested purchases can be made from our > website at: > > http://tinyurl.com/cgr42l5 > > Put your order details in the Commends/Special Rquests > box at the bottom of the form. The boards are $22 ea > plus first class postage of $2.25 > > I'll plan on ordering boards on Monday . . . > > > Assembly instructions for this project are available > at: > > http://tinyurl.com/ngoo6hc > > > [image: Emacs!] > > Perhaps the better term is 'unpopulated'. It looks > like this when you're done. > > [image: Emacs!] > > > Bob . . . <http://??.htm> > > No virus found in this message. > Checked by AVG - www.avg.com > 11/27/16 > > > Bob . . . >


    Message 19


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    Time: 06:43:57 PM PST US
    From: don van santen <donvansanten@gmail.com>
    Subject: Re: Audio Isolation Amplifier Boards
    Bob, Just noticed this. Would this be a good way to connect an xm roady music receiver to my audio panel? Background, The roady has no volume control and is intended to plug into a cassette player using the supplied adapter. I wired it directly to my Garmin audio panel. It worked fine except The volume was lower than needed. I am changing to a PS Engineering PDA 360XR audio panel that has music input volume controls. I am not sure that the new install will have adequate volume. Any ideas on how to increase the volume? On Fri, Dec 30, 2016 at 6:32 PM, don van santen <donvansanten@gmail.com> wrote: > Bob, > Just noticed this. Would this be a good way to connect an xm roady music > receiver to my audio panel? > Background, The roady has no volume control and is intended to plug into a > cassette player using the supplied adapter. I wired it directly to my > Garmin audio panel. It worked fine except The volume was lower than needed. > I am changing to a PS Engineering PDA 360XR audio panel that has music > input volume controls. I am not sure that the new install will have > adequate volume. Any ideas on how to increase the volume? > > On Thu, Dec 8, 2016 at 1:00 PM, Robert L. Nuckolls, III < > nuckolls.bob@aeroelectric.com> wrote: > >> I've had a number of folks express and interst in >> acquiring the boards to the DIY audio Isolation >> amplifier. >> >> Interested purchases can be made from our >> website at: >> >> http://tinyurl.com/cgr42l5 >> >> Put your order details in the Commends/Special Rquests >> box at the bottom of the form. The boards are $22 ea >> plus first class postage of $2.25 >> >> I'll plan on ordering boards on Monday . . . >> >> >> Assembly instructions for this project are available >> at: >> >> http://tinyurl.com/ngoo6hc >> >> >> [image: Emacs!] >> >> Perhaps the better term is 'unpopulated'. It looks >> like this when you're done. >> >> [image: Emacs!] >> >> >> >> >> Bob . . . <http://??.htm> >> >> No virus found in this message. >> Checked by AVG - www.avg.com >> 11/27/16 >> >> >> >> >> Bob . . . >> > >


    Message 20


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    Time: 11:12:03 PM PST US
    Subject: Re: USB
    From: Eric Page <edpav8r@yahoo.com>
    Jared, This thread was somehow split from the original post on this subject a few d ays ago. If you look at the original thread, here... http://forums.matronics.com/viewtopic.php?t=16765274 ...in the 6th message I described exactly the info you're looking for. Another option, if you have the ability to lay out and solder a circuit boar d using surface mount components, is to use an IC like the Texas Instruments TPS2513A or TPS2514A: http://www.ti.com/lit/ds/symlink/tps2514.pdf Eric > On Dec 30, 2016, at 5:34 PM, Jared Yates <email@jaredyates.com> wrote: > This has all been really useful discussion, thank you! To take it from the theoretical to the actionable (I'm ready to get out my soldering iron), do w e have a specific list of resistors and a schematic to get the appropriate v olts on the data pins if we use something like the 5v power supply that Joe l inked in the beginning of the discussion? It seems that there's no need for a ll of us to do the trial and error if we have the same volts coming in and t he same device connected to the plug.




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