Jim Thompson wrote:> On Sat, 17 Jan 2015 04:18:49 -0800, mike<ham789@netzero.net> wrote: > >> I need an MP3 player that runs 24/7. >> All the ones I have shut down and switch to file transfer mode >> when you plug in USB. >> So, I think I need a 1.5V AAA battery eliminator. >> >> All my wall warts use a TL431 as regulator. >> >> If I could find a replacement with 1.2V-ish reference in TO-92 >> I could just drop it in and change one resistor to get 1.5V. >> >> What's a good cheap, shunt-regulator IC that will go down to 1.5V? >> >> TL431 is 5 for a buck shipped on ebay. >> Closest thing I can find in 1.2V are SMT devices at $10 each shipped. >> >> Anything cheap available? >> >> Suppose I could use a Darlington transistor and not sweat the tempco. >> >> Designing a supply from scratch is trivial. Problem is packaging it. >> I'm not that motivated. >> >> Ideas? >> Thanks, mike > > <http://electronicdesign.com/power/shunt-regulator-boasts-124v-reference-voltage>* GODDAMN F*cking pop-up!!!!!!!!!!!!! This _SHIT_ is becoming more prevalent,and is impossible to prevent.> > <http://www.ti.com/product/tlv431> > > ...Jim Thompson
TL431 replacement with 1.2V reference???
Started by ●January 17, 2015
Reply by ●January 17, 20152015-01-17
Reply by ●January 17, 20152015-01-17
On 1/17/2015 10:26 AM, Robert Baer wrote:> mike wrote: >> I need an MP3 player that runs 24/7. >> All the ones I have shut down and switch to file transfer mode >> when you plug in USB. >> So, I think I need a 1.5V AAA battery eliminator. >> >> All my wall warts use a TL431 as regulator. >> ------------------------^^^^ > I have NEVER seen a "standard" wallwart that was regulated. > Only special wall warts are regulated, and a number of those use 7805 > type regulators (and many of thse are heat-sinked). > > >Guess you've never seen a cellphone or tablet or laptop or ...
Reply by ●January 17, 20152015-01-17
On 1/17/2015 6:26 AM, jrwalliker@gmail.com wrote:> On Saturday, 17 January 2015 12:19:34 UTC, mike wrote: > >> All my wall warts use a TL431 as regulator. >> >> If I could find a replacement with 1.2V-ish reference in TO-92 >> I could just drop it in and change one resistor to get 1.5V. >> >> What's a good cheap, shunt-regulator IC that will go down to 1.5V? >> >> TL431 is 5 for a buck shipped on ebay. >> Closest thing I can find in 1.2V are SMT devices at $10 each shipped. >> >> Anything cheap available? > > Why not use a TLV431 which is available in TO-92 from several manufacturers? > > John >Thanks, the part number is obvious once you know what it is ;-). The 6V max is a concern, but I can run some tests to verify that there aren't transients over that voltage at the chip. mike
Reply by ●January 17, 20152015-01-17
On 1/17/2015 6:46 AM, Jan Panteltje wrote:> On a sunny day (Sat, 17 Jan 2015 04:18:49 -0800) it happened mike > <ham789@netzero.net> wrote in <m9djvk$33m$1@dont-email.me>: > >> I need an MP3 player that runs 24/7. >> All the ones I have shut down and switch to file transfer mode >> when you plug in USB. >> So, I think I need a 1.5V AAA battery eliminator. >> >> All my wall warts use a TL431 as regulator. >> >> If I could find a replacement with 1.2V-ish reference in TO-92 >> I could just drop it in and change one resistor to get 1.5V. > > Series regulator, LM317 will go down to 1.2 V and up to > 30V > I am using one for just that purpose with my Creative USB mp3 player. >My first thought was to put a LM317 in the dummy battery and run it off 5V. But the power dissipation made me uncomfortable in the TO-92. Trying to keep it simple without a lot of extra crap in the wire getting hot. Just modding the wall wart seemed like a slam-dunk until I realized the reference voltage was too high. I think the TLV431 will fix it.
Reply by ●January 17, 20152015-01-17
On 1/17/2015 5:19 AM, DecadentLinuxUserNumeroUno wrote:> On Sat, 17 Jan 2015 04:18:49 -0800, mike wrote: > >> I need an MP3 player that runs 24/7. >> All the ones I have shut down and switch to file transfer mode when you >> plug in USB. > > VLC media player play videos, but it also plays music and FLAC, which is > miles better than MP3. > > Another choice would be to run Linux, and not be hog tied by the > stupidity Windows places on a user. >Another choice would be to help people do what they want to do instead of trying to force your choices on them. It appears that your penchant for ignoring the real world and forcing your choices on others transcend AOLU. VLC does not run on my MP3 player...nor does FLAC. The quality of FLAC is IRRELEVANT, unless you're in a mood to rip my mp3 collection again, supply the media to store it, the player for it and the speakers good enough to let me hear the difference. OH, I'm gonna need a better internet connection. With my current data budget, it would take you 50 years to send it back to me. The real world is far more complex than your tunnel vision admits. MP3 is a standard that JUST WORKS perfectly fine enough, on virtually every player available. Your ranting isn't gonna change the fact that, in the real world, JUST WORKS, GOOD ENOUGH and COMPATIBILITY trump MILES BETTER, especially when most people wouldn't be able to tell the difference under typical listening conditions. Linux doesn't run on my MP3 player. Are we sensing a trend here? Nice bit of windows bashing in a thread about a voltage regulator. Have a very UNO day ignoring the real world.
Reply by ●January 17, 20152015-01-17
On Sat, 17 Jan 2015 13:01:57 -0800, mike wrote:> On 1/17/2015 5:19 AM, DecadentLinuxUserNumeroUno wrote: >> On Sat, 17 Jan 2015 04:18:49 -0800, mike wrote: >> >>> I need an MP3 player that runs 24/7. >>> All the ones I have shut down and switch to file transfer mode when >>> you plug in USB. >> >> VLC media player play videos, but it also plays music and FLAC, which >> is miles better than MP3. >> >> Another choice would be to run Linux, and not be hog tied by the >> stupidity Windows places on a user. >> > Another choice would be to help people do what they want to do instead > of trying to force your choices on them.Idiot. IF you had any clue, you would see that that is exactly what Windows' lame USB insertion event handling is doing. But I would not expect a complete and utter dumbfuck like you to get that FACT. The question was answered correctly. Use VLC, which ignores Windows stupidity, OR use a BETTER OS, which doesn't pull the stupidty WindBLOWS does. But then, you have zero grasp of what takes place in the hardware, because you have zero grasp of what takes place in the OS. I have doubts you even know how to run an application without pissing and moaning, even on your pathetic OS of choice. I can't say get a clue, because you lack the capacity to receive a clue, much less get one once you do.
Reply by ●January 17, 20152015-01-17
On 1/17/2015 2:56 PM, DecadentLinuxUserNumeroUno wrote:> On Sat, 17 Jan 2015 13:01:57 -0800, mike wrote: > >> On 1/17/2015 5:19 AM, DecadentLinuxUserNumeroUno wrote: >>> On Sat, 17 Jan 2015 04:18:49 -0800, mike wrote: >>> >>>> I need an MP3 player that runs 24/7. >>>> All the ones I have shut down and switch to file transfer mode when >>>> you plug in USB. >>> >>> VLC media player play videos, but it also plays music and FLAC, which >>> is miles better than MP3. >>> >>> Another choice would be to run Linux, and not be hog tied by the >>> stupidity Windows places on a user. >>> >> Another choice would be to help people do what they want to do instead >> of trying to force your choices on them. > > Idiot. IF you had any clue, you would see that that is exactly what > Windows' lame USB insertion event handling is doing.I just love these conversations where you make a big deal over something entirely different from what's happening. The OS is NOT involved at all. If you plug the mp3 player into a power supply, it does the same thing. It works just fine with an OS for file transfer. The mp3 player will not allow you to play mp3's when there's power on the usb plug. NOTHING AT ALL TO DO WITH ANY OS, NOT EVEN THE ONE YOU HATE SO MUCH! Thanks for giving me the opportunity to rub your nose in your own effluent. Please go back where you have peer support for your unfounded denigration. They miss you...> > But I would not expect a complete and utter dumbfuck like you to get > that FACT. > > The question was answered correctly. > > Use VLC, which ignores Windows stupidity, OR use a BETTER OS, which > doesn't pull the stupidty WindBLOWS does. > > But then, you have zero grasp of what takes place in the hardware, > because you have zero grasp of what takes place in the OS. I have doubts > you even know how to run an application without pissing and moaning, even > on your pathetic OS of choice. > > I can't say get a clue, because you lack the capacity to receive a clue, > much less get one once you do. >
Reply by ●January 17, 20152015-01-17
On 1/17/2015 12:27 PM, mike wrote:> On 1/17/2015 6:26 AM, jrwalliker@gmail.com wrote: >> On Saturday, 17 January 2015 12:19:34 UTC, mike wrote: >> >>> All my wall warts use a TL431 as regulator. >>> >>> If I could find a replacement with 1.2V-ish reference in TO-92 >>> I could just drop it in and change one resistor to get 1.5V. >>> >>> What's a good cheap, shunt-regulator IC that will go down to 1.5V? >>> >>> TL431 is 5 for a buck shipped on ebay. >>> Closest thing I can find in 1.2V are SMT devices at $10 each shipped. >>> >>> Anything cheap available? >> >> Why not use a TLV431 which is available in TO-92 from several >> manufacturers? >> >> John >> > Thanks, the part number is obvious once you know what it is ;-). > The 6V max is a concern, but I can run some tests to verify that > there aren't transients over that voltage at the chip. > mikeWell, there's insufficient headroom for the TLV431 or the darlington. But one NPN transistor works just fine. Regulation and tempco are crap, but well within the range of a battery over the environmental conditions likely to be encountered in my living room. And the player sounds great.
Reply by ●January 17, 20152015-01-17
On Saturday, January 17, 2015 at 4:50:10 PM UTC-8, mike wrote:> On 1/17/2015 12:27 PM, mike wrote:[about low-V output limit of a SMPS design]> >>> All my wall warts use a TL431 as regulator.> Well, there's insufficient headroom for the TLV431 or the darlington.If you want, you can use the TLV431 to program a current mirror, and drive the LED with the current mirror output, if this refers to the common TL(V)431/optoisolator feedback in an isolated switching power supply.
Reply by ●January 17, 20152015-01-17
On Sat, 17 Jan 2015 04:18:49 -0800, mike wrote:> I need an MP3 player that runs 24/7.You mislead folks here. Nice ambiguity introduction. "an mp3 player" usually refers to software on a computer, not some lame toy you were stupid enough to buy one of.> All the ones I have shut down and switch to file transfer mode when you > plug in USB.Must be their OS. Maybe you should develop a different procedure that does not invoke that problem. Or buy a better device.> So, I think I need a 1.5V AAA battery eliminator.This will abate the USB handshake mode change how?
