On Mon, 20 Jun 2022 14:13:16 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:>jlarkin@highlandsniptechnology.com wrote: >> On Sun, 19 Jun 2022 16:27:43 -0700, jlarkin@highlandsniptechnology.com >> wrote: >> >>> On Sun, 19 Jun 2022 15:11:36 -0700 (PDT), John Walliker >>> <jrwalliker@gmail.com> wrote: >>> >>>> On Sunday, 19 June 2022 at 21:57:45 UTC+1, whit3rd wrote: >>>>> On Sunday, June 19, 2022 at 11:26:59 AM UTC-7, Ricky wrote: >>>>>> On Saturday, June 18, 2022 at 3:27:11 AM UTC-4, whit3rd wrote: >>>>> >>>>>>> As for 'make sense' decisions: overcurrent or overvoltage would usually >>>>>>> not wait for a smart digital chip's decision, but do something appropriate >>>>>>> with a protective relay, circuit breaker, fuse... Undervoltage though, >>>>>>> that's where a sense wire solution shines (take a millisecond, but get >>>>>>> the value RIGHT before a guy with a meter sees the problem). >>>>> >>>>>> What? A relay is too fast to wait for a digital chip to control it??? A RELAY? >>>>> The input is a switchmode supply, intrinsically power limited by its >>>>> nature, and only responding to logic input after finishing a current pulse. It's >>>>> not lightning protection here, just craziness of the switching logic to be considered. >>>>> >>>>> I'd not trust the switching logic more than a relay. Latency in sampling, >>>>> and decision logic, and switch period, may not be negligible. >>>> >>>> A much bigger concern is that none of the usual distributors seem >>>> to have ADUM7703s in stock. It looks like a nice device - I could use a few if >>>> only I could buy them! >>>> John >>> >>> It's really cool. If you clock it at 20 MHz, you can process the data >>> stream to get 15 bits at 625 ks/s or 27 bits at 39 ks/s. >>> >>> The fpga sinc3 filter looks insane to me, but it works. >>> >>> Mouser is expecting some in 2023! >> >> I guess I'll use diffamps into a grounded ADC instead of truly >> isolated ADCs. The ADUM is great for hanging across a current shunt, >> but there are not-quite-isolated ways to digitize currents too. > >That also avoids problems with multiple grounds. Connecting a BNC cable >to something at the load end could trash the 1-wire sense measurement. > >> Looks like we can still buy opamps and resistors! Not much else. > >We're exploring new micros, because the new products are all we can get. > We're also having to make DFN-to-SOIC turret-style adapter boards >because some asshole bought up the world's supply of ADA4899s in the >sane packages, and is selling them for $15ish instead of $5ish. > >Using the adapter saves spinning the board, and allows us to go back to >normal whenever that blessed state arrives. (Hopefully it isn't like >the starship waiting for the lemon-scented paper napkins in The >Restaurant at the End of the Universe.) > >Cheers > >Phil HobbsM**** scrooed us badly, so we had to make 3000 of this: https://www.dropbox.com/s/lzvv09ymjxwpdtj/Break2.jpg?raw=1 https://www.dropbox.com/s/50b1af02vcoqjgk/OnBoard.jpg?raw=1 -- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end in certainties. Francis Bacon
power supply 1-wire remote sense
Started by ●June 17, 2022
Reply by ●June 20, 20222022-06-20
Reply by ●June 20, 20222022-06-20
jlarkin@highlandsniptechnology.com wrote:> This ought to work and has some real virtues. > > https://www.dropbox.com/s/s3swzhh7b0kd8f9/1-wire_sense.jpg?raw=1Another trick worth mentioning is to use a 595 with two sufficiently different tau RC integrators at the inputs. With the built-in Schmitt triggers these form monostable multivibrators and allow piggy-backing of the strobe signals on the data line. One can further steal the idea from the Dallas 1-wire chips and by adding a diode merge the VDD and the data line. By PWMing the VDD it becomes a truly one-way 1-wire digital link. Now, if the current consumption of the receiver is known, the receiver can connect (or not) a digitally controlled load, say 3x the current consumption for easy discrimination. The transmitter now sees I_load or 3xI-load and a receiver -> transmitter channel is formed with the same VDD line. You end up with a bidirectional 1-wire link using jellybean parts at the receiver end. The complexity is in the transmitter. Best regards, Piotr
Reply by ●June 20, 20222022-06-20
John Larkin wrote:> On Mon, 20 Jun 2022 14:13:16 -0400, Phil Hobbs > <pcdhSpamMeSenseless@electrooptical.net> wrote: > >> jlarkin@highlandsniptechnology.com wrote: >>> On Sun, 19 Jun 2022 16:27:43 -0700, jlarkin@highlandsniptechnology.com >>> wrote: >>> >>>> On Sun, 19 Jun 2022 15:11:36 -0700 (PDT), John Walliker >>>> <jrwalliker@gmail.com> wrote: >>>> >>>>> On Sunday, 19 June 2022 at 21:57:45 UTC+1, whit3rd wrote: >>>>>> On Sunday, June 19, 2022 at 11:26:59 AM UTC-7, Ricky wrote: >>>>>>> On Saturday, June 18, 2022 at 3:27:11 AM UTC-4, whit3rd wrote: >>>>>> >>>>>>>> As for 'make sense' decisions: overcurrent or overvoltage would usually >>>>>>>> not wait for a smart digital chip's decision, but do something appropriate >>>>>>>> with a protective relay, circuit breaker, fuse... Undervoltage though, >>>>>>>> that's where a sense wire solution shines (take a millisecond, but get >>>>>>>> the value RIGHT before a guy with a meter sees the problem). >>>>>> >>>>>>> What? A relay is too fast to wait for a digital chip to control it??? A RELAY? >>>>>> The input is a switchmode supply, intrinsically power limited by its >>>>>> nature, and only responding to logic input after finishing a current pulse. It's >>>>>> not lightning protection here, just craziness of the switching logic to be considered. >>>>>> >>>>>> I'd not trust the switching logic more than a relay. Latency in sampling, >>>>>> and decision logic, and switch period, may not be negligible. >>>>> >>>>> A much bigger concern is that none of the usual distributors seem >>>>> to have ADUM7703s in stock. It looks like a nice device - I could use a few if >>>>> only I could buy them! >>>>> John >>>> >>>> It's really cool. If you clock it at 20 MHz, you can process the data >>>> stream to get 15 bits at 625 ks/s or 27 bits at 39 ks/s. >>>> >>>> The fpga sinc3 filter looks insane to me, but it works. >>>> >>>> Mouser is expecting some in 2023! >>> >>> I guess I'll use diffamps into a grounded ADC instead of truly >>> isolated ADCs. The ADUM is great for hanging across a current shunt, >>> but there are not-quite-isolated ways to digitize currents too. >> >> That also avoids problems with multiple grounds. Connecting a BNC cable >> to something at the load end could trash the 1-wire sense measurement. >> >>> Looks like we can still buy opamps and resistors! Not much else. >> >> We're exploring new micros, because the new products are all we can get. >> We're also having to make DFN-to-SOIC turret-style adapter boards >> because some asshole bought up the world's supply of ADA4899s in the >> sane packages, and is selling them for $15ish instead of $5ish. >> >> Using the adapter saves spinning the board, and allows us to go back to >> normal whenever that blessed state arrives. (Hopefully it isn't like >> the starship waiting for the lemon-scented paper napkins in The >> Restaurant at the End of the Universe.) >>> M**** scrooed us badly, so we had to make 3000 of this: > > https://www.dropbox.com/s/lzvv09ymjxwpdtj/Break2.jpg?raw=1 > > https://www.dropbox.com/s/50b1af02vcoqjgk/OnBoard.jpg?raw=1 >Yup, that's the plan for us too. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
Reply by ●June 20, 20222022-06-20
On Monday, 20 June 2022 at 20:33:55 UTC+1, Piotr Wyderski wrote:> jla...@highlandsniptechnology.com wrote: > > > This ought to work and has some real virtues. > > > > https://www.dropbox.com/s/s3swzhh7b0kd8f9/1-wire_sense.jpg?raw=1 > Another trick worth mentioning is to use a 595 with two sufficiently > different tau RC integrators at the inputs. With the built-in Schmitt > triggers these form monostable multivibrators and allow piggy-backing of > the strobe signals on the data line. One can further steal the idea from > the Dallas 1-wire chips and by adding a diode merge the VDD and the data > line. By PWMing the VDD it becomes a truly one-way 1-wire digital link. > Now, if the current consumption of the receiver is known, the receiver > can connect (or not) a digitally controlled load, say 3x the current > consumption for easy discrimination. The transmitter now sees I_load or > 3xI-load and a receiver -> transmitter channel is formed with the same > VDD line. You end up with a bidirectional 1-wire link using jellybean > parts at the receiver end. The complexity is in the transmitter. > > Best regards, PiotrSomething similar has been done in cochlear implants where low bandwidth telemetry is sent back to the external rf transmitter by modulating the load . John
Reply by ●June 20, 20222022-06-20
Anybody can take some words from my reply to John Larkin, stick them in Google's search engine, and find ACCURATE information about the subject. Bozo should stick to arguing with "a a", they make a good pair... -- Anthony William Sloman <bill.sloman@ieee.org> wrote:> X-Received: by 2002:a05:600c:4f10:b0:39c:7e7d:b9de with SMTP id l16-20020a05600c4f1000b0039c7e7db9demr24959191wmq.94.1655732891782; Mon, 20 Jun 2022 06:48:11 -0700 (PDT) > X-Received: by 2002:a25:e781:0:b0:668:b973:7f22 with SMTP id e123-20020a25e781000000b00668b9737f22mr17886017ybh.512.1655732891117; Mon, 20 Jun 2022 06:48:11 -0700 (PDT) > Path: eternal-september.org!reader02.eternal-september.org!weretis.net!feeder8.news.weretis.net!proxad.net!feeder1-2.proxad.net!209.85.128.87.MISMATCH!news-out.google.com!nntp.google.com!postnews.google.com!google-groups.googlegroups.com!not-for-mail > Newsgroups: sci.electronics.design > Date: Mon, 20 Jun 2022 06:48:10 -0700 (PDT) > In-Reply-To: <t8p01a$q7d$1@dont-email.me> > Injection-Info: google-groups.googlegroups.com; posting-host=192.87.79.65; posting-account=SJ46pgoAAABuUDuHc5uDiXN30ATE-zi- > NNTP-Posting-Host: 192.87.79.65 > References: <fee7c65c-1e2e-4a44-b7be-2f06c609715bn@googlegroups.com> <53ppah1es0nl6tsgblhnjs8f96jvadcgbt@4ax.com> <P7qdnSQX-_EIZzH_nZ2dnUU7-ffNnZ2d@giganews.com> <lhvpahh9h2iak2mruc8hlg9jt9n1is7al8@4ax.com> <be729e4d-15cb-404e-bba3-34c8d3bce703n@googlegroups.com> <679d5a33-3dbf-4bd0-9a94-7b9b6114dc60n@googlegroups.com> <6fa7a5c0-acea-4ade-b7ec-98a18ec30817n@googlegroups.com> <b4bd89b6-2032-4593-8860-431a128bb87en@googlegroups.com> <dubvahtdfopbrsb256jgijm1vqevhq6iii@4ax.com> <h9tvah9fg42l9e6t82sg2g54g2nlndh2im@4ax.com> <t8p01a$q7d$1@dont-email.me> > User-Agent: G2/1.0 > MIME-Version: 1.0 > Message-ID: <3238a30d-1aff-410f-9b36-7b2d0ea6ac39n@googlegroups.com> > Subject: Re: power supply 1-wire remote sense > From: Anthony William Sloman <bill.sloman@ieee.org> > Injection-Date: Mon, 20 Jun 2022 13:48:11 +0000 > Content-Type: text/plain; charset="UTF-8" > Content-Transfer-Encoding: quoted-printable > Xref: reader02.eternal-september.org sci.electronics.design:672134 > > On Monday, June 20, 2022 at 7:19:44 AM UTC+2, John Doe wrote: >> jla...@highlandsniptechnology.com wrote: >> >> > jla...@highlandsniptechnology.com wrote: >> >> John Walliker wrote: >> >>> whit3rd wrote: >> >>>> Ricky wrote: >> >>>>> whit3rd wrote: > > <snip> > >> It might get worse still. Prolonging the Russian-Ukrainian conflict will > >> curb Russian and Ukrainian exports of noble gasses like neon, krypton, an > d >> xenon, all key ingredients in the manufacturing of semiconductor chips. I > f >> I read it correctly, chips manufactured in China might be less affected > >> than others. > > https://en.wikipedia.org/wiki/Noble_gas > > "Neon, argon, krypton, and xenon are obtained from air in an air separation unit using the methods of liquefaction of gases and fractional distillation." > > Everybody liquifies air and sells liquid nitrogen. Elaborating the the plant a bit to pull out the noble gases isn't rocket science. Russia and the Ukraine may have tooled up for cheap mass production, but replacing them isn't going to be a big deal. It would probably just mean taking old kit out of mothball storage. > > -- > Bill Sloman, Sydney >
Reply by ●June 20, 20222022-06-20
John Dope stated the following in message-id <svsh05$lbh$5@dont-email.me> (http://al.howardknight.net/?ID=164904625100) posted Fri, 4 Mar 2022 08:01:09 -0000 (UTC):> Compared to other regulars, Bozo contributes practically nothing > except insults to this group.Yet, since Wed, 5 Jan 2022 04:10:38 -0000 (UTC) John Dope's post ratio to USENET (**) has been 61.9% of its posts contributing "nothing except insults" to USENET. ** Since Wed, 5 Jan 2022 04:10:38 -0000 (UTC) John Dope has posted at least 2000 articles to USENET. Of which 173 have been pure insults and 1065 have been John Dope "troll format" postings. The Troll Doe stated the following in message-id <sdhn7c$pkp$4@dont-email.me>:> The troll doesn't even know how to format a USENET post...And the Troll Doe stated the following in message-id <sg3kr7$qt5$1@dont-email.me>:> The reason Bozo cannot figure out how to get Google to keep from > breaking its lines in inappropriate places is because Bozo is > CLUELESS...And yet, the clueless Troll Doe has continued to post incorrectly formatted USENET articles that are devoid of content (latest example on Mon, 20 Jun 2022 22:24:14 -0000 (UTC) in message-id <t8qs2e$u6p$1@dont-email.me>). NOBODY likes the John Doe troll's contentless spam. This posting is a public service announcement for any google groups readers who happen by to point out that John Dope does not even follow the rules it uses to troll other posters. aI0yujn9zAQo
Reply by ●June 20, 20222022-06-20
On Mon, 20 Jun 2022 16:01:11 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:>John Larkin wrote: >> On Mon, 20 Jun 2022 14:13:16 -0400, Phil Hobbs >> <pcdhSpamMeSenseless@electrooptical.net> wrote: >> >>> jlarkin@highlandsniptechnology.com wrote: >>>> On Sun, 19 Jun 2022 16:27:43 -0700, jlarkin@highlandsniptechnology.com >>>> wrote: >>>> >>>>> On Sun, 19 Jun 2022 15:11:36 -0700 (PDT), John Walliker >>>>> <jrwalliker@gmail.com> wrote: >>>>> >>>>>> On Sunday, 19 June 2022 at 21:57:45 UTC+1, whit3rd wrote: >>>>>>> On Sunday, June 19, 2022 at 11:26:59 AM UTC-7, Ricky wrote: >>>>>>>> On Saturday, June 18, 2022 at 3:27:11 AM UTC-4, whit3rd wrote: >>>>>>> >>>>>>>>> As for 'make sense' decisions: overcurrent or overvoltage would usually >>>>>>>>> not wait for a smart digital chip's decision, but do something appropriate >>>>>>>>> with a protective relay, circuit breaker, fuse... Undervoltage though, >>>>>>>>> that's where a sense wire solution shines (take a millisecond, but get >>>>>>>>> the value RIGHT before a guy with a meter sees the problem). >>>>>>> >>>>>>>> What? A relay is too fast to wait for a digital chip to control it??? A RELAY? >>>>>>> The input is a switchmode supply, intrinsically power limited by its >>>>>>> nature, and only responding to logic input after finishing a current pulse. It's >>>>>>> not lightning protection here, just craziness of the switching logic to be considered. >>>>>>> >>>>>>> I'd not trust the switching logic more than a relay. Latency in sampling, >>>>>>> and decision logic, and switch period, may not be negligible. >>>>>> >>>>>> A much bigger concern is that none of the usual distributors seem >>>>>> to have ADUM7703s in stock. It looks like a nice device - I could use a few if >>>>>> only I could buy them! >>>>>> John >>>>> >>>>> It's really cool. If you clock it at 20 MHz, you can process the data >>>>> stream to get 15 bits at 625 ks/s or 27 bits at 39 ks/s. >>>>> >>>>> The fpga sinc3 filter looks insane to me, but it works. >>>>> >>>>> Mouser is expecting some in 2023! >>>> >>>> I guess I'll use diffamps into a grounded ADC instead of truly >>>> isolated ADCs. The ADUM is great for hanging across a current shunt, >>>> but there are not-quite-isolated ways to digitize currents too. >>> >>> That also avoids problems with multiple grounds. Connecting a BNC cable >>> to something at the load end could trash the 1-wire sense measurement. >>> >>>> Looks like we can still buy opamps and resistors! Not much else. >>> >>> We're exploring new micros, because the new products are all we can get. >>> We're also having to make DFN-to-SOIC turret-style adapter boards >>> because some asshole bought up the world's supply of ADA4899s in the >>> sane packages, and is selling them for $15ish instead of $5ish. >>> >>> Using the adapter saves spinning the board, and allows us to go back to >>> normal whenever that blessed state arrives. (Hopefully it isn't like >>> the starship waiting for the lemon-scented paper napkins in The >>> Restaurant at the End of the Universe.) >>> > >> M**** scrooed us badly, so we had to make 3000 of this: >> >> https://www.dropbox.com/s/lzvv09ymjxwpdtj/Break2.jpg?raw=1 >> >> https://www.dropbox.com/s/50b1af02vcoqjgk/OnBoard.jpg?raw=1 >> > >Yup, that's the plan for us too. > >Cheers > >Phil HobbsMouse bites too? That worked great. Maxim trashed us by discontinuing the MAX9690 comparator, and then they started failing in the field after about a year. Some sort of oxide diffusion problem. To be fair, they "sampled" us 3000 of the MAX9691 that we used on the adapter boards. -- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end in certainties. Francis Bacon
Reply by ●June 20, 20222022-06-20
On Monday, June 20, 2022 at 2:28:08 PM UTC-7, John Walliker wrote:> On Monday, 20 June 2022 at 20:33:55 UTC+1, Piotr Wyderski wrote:> > Another trick worth mentioning is to use a 595 with two sufficiently > > different tau RC integrators at the inputs. With the built-in Schmitt > > triggers these form monostable multivibrators and allow piggy-backing of > > the strobe signals on the data line. One can further steal the idea from > > the Dallas 1-wire chips and by adding a diode merge the VDD and the data > > line. By PWMing the VDD it becomes a truly one-way 1-wire digital link. > > Now, if the current consumption of the receiver is known, the receiver > > can connect (or not) a digitally controlled load, say 3x the current > > consumption for easy discrimination. The transmitter now sees I_load or > > 3xI-load and a receiver -> transmitter channel is formed with the same > > VDD line. You end up with a bidirectional 1-wire link using jellybean > > parts at the receiver end. The complexity is in the transmitter.> Something similar has been done in cochlear implants where low > bandwidth telemetry is sent back to the external rf transmitter by > modulating the load .Even with high voltages, a 4-to-20 mA signal can be workable with a single wire (and some notion of ground). I've also had occasion to run a VCO from a follower transistor power supply, taking the frequency as my analog signal by loading the oscillator's output and observing the follower's collector current swing.
Reply by ●June 21, 20222022-06-21
On Tuesday, June 21, 2022 at 12:24:24 AM UTC+2, John Doe wrote:> Anthony William Sloman <bill....@ieee.org> wrote:> > On Monday, June 20, 2022 at 7:19:44 AM UTC+2, John Doe wrote: > >> jla...@highlandsniptechnology.com wrote: > >> > jla...@highlandsniptechnology.com wrote: > >> >> John Walliker wrote: > >> >>> whit3rd wrote: > >> >>>> Ricky wrote: > >> >>>>> whit3rd wrote: > > > > <snip> > > > >> It might get worse still. Prolonging the Russian-Ukrainian conflict will curb Russian and Ukrainian exports of noble gasses like neon, krypton, and xenon, all key ingredients in the manufacturing of semiconductor chips. If I read it correctly, chips manufactured in China might be less affected than others. > > > > https://en.wikipedia.org/wiki/Noble_gas > > > > "Neon, argon, krypton, and xenon are obtained from air in an air separation unit using the methods of liquefaction of gases and fractional distillation." > > > > Everybody liquifies air and sells liquid nitrogen. Elaborating the the plant a bit to pull out the noble gases isn't rocket science. Russia and the Ukraine may have tooled up for cheap mass production, but replacing them isn't going to be a big deal. It would probably just mean taking old kit out of mothball storage. > > Anybody can take some words from my reply to John Larkin, stick them in Google's search engine, and find ACCURATE information about the subject.Anybody except John Doe. He hasn't done it at all. He's implicitly claiming that my words are inaccurate, but he hasn't bothered to tell us why he thinks this. In fact he's just an idiot who resents have his idiocy jeered at. Quite how my bland assertion of simple - easily verified - facts could be "inaccurate" is hard to imagine, but John Doe doesn't understand enough to realise this. -- Bill Sloman, Sydney
Reply by ●June 21, 20222022-06-21
John Larkin wrote:> On Mon, 20 Jun 2022 16:01:11 -0400, Phil Hobbs > <pcdhSpamMeSenseless@electrooptical.net> wrote: > >> John Larkin wrote: >>> On Mon, 20 Jun 2022 14:13:16 -0400, Phil Hobbs >>> <pcdhSpamMeSenseless@electrooptical.net> wrote: >>> >>>> jlarkin@highlandsniptechnology.com wrote: >>>>> On Sun, 19 Jun 2022 16:27:43 -0700, jlarkin@highlandsniptechnology.com >>>>> wrote: >>>>> >>>>>> On Sun, 19 Jun 2022 15:11:36 -0700 (PDT), John Walliker >>>>>> <jrwalliker@gmail.com> wrote: >>>>>> >>>>>>> On Sunday, 19 June 2022 at 21:57:45 UTC+1, whit3rd wrote: >>>>>>>> On Sunday, June 19, 2022 at 11:26:59 AM UTC-7, Ricky wrote: >>>>>>>>> On Saturday, June 18, 2022 at 3:27:11 AM UTC-4, whit3rd wrote: >>>>>>>> >>>>>>>>>> As for 'make sense' decisions: overcurrent or overvoltage would usually >>>>>>>>>> not wait for a smart digital chip's decision, but do something appropriate >>>>>>>>>> with a protective relay, circuit breaker, fuse... Undervoltage though, >>>>>>>>>> that's where a sense wire solution shines (take a millisecond, but get >>>>>>>>>> the value RIGHT before a guy with a meter sees the problem). >>>>>>>> >>>>>>>>> What? A relay is too fast to wait for a digital chip to control it??? A RELAY? >>>>>>>> The input is a switchmode supply, intrinsically power limited by its >>>>>>>> nature, and only responding to logic input after finishing a current pulse. It's >>>>>>>> not lightning protection here, just craziness of the switching logic to be considered. >>>>>>>> >>>>>>>> I'd not trust the switching logic more than a relay. Latency in sampling, >>>>>>>> and decision logic, and switch period, may not be negligible. >>>>>>> >>>>>>> A much bigger concern is that none of the usual distributors seem >>>>>>> to have ADUM7703s in stock. It looks like a nice device - I could use a few if >>>>>>> only I could buy them! >>>>>>> John >>>>>> >>>>>> It's really cool. If you clock it at 20 MHz, you can process the data >>>>>> stream to get 15 bits at 625 ks/s or 27 bits at 39 ks/s. >>>>>> >>>>>> The fpga sinc3 filter looks insane to me, but it works. >>>>>> >>>>>> Mouser is expecting some in 2023! >>>>> >>>>> I guess I'll use diffamps into a grounded ADC instead of truly >>>>> isolated ADCs. The ADUM is great for hanging across a current shunt, >>>>> but there are not-quite-isolated ways to digitize currents too. >>>> >>>> That also avoids problems with multiple grounds. Connecting a BNC cable >>>> to something at the load end could trash the 1-wire sense measurement. >>>> >>>>> Looks like we can still buy opamps and resistors! Not much else. >>>> >>>> We're exploring new micros, because the new products are all we can get. >>>> We're also having to make DFN-to-SOIC turret-style adapter boards >>>> because some asshole bought up the world's supply of ADA4899s in the >>>> sane packages, and is selling them for $15ish instead of $5ish. >>>> >>>> Using the adapter saves spinning the board, and allows us to go back to >>>> normal whenever that blessed state arrives. (Hopefully it isn't like >>>> the starship waiting for the lemon-scented paper napkins in The >>>> Restaurant at the End of the Universe.) >>>> >> >>> M**** scrooed us badly, so we had to make 3000 of this: >>> >>> https://www.dropbox.com/s/lzvv09ymjxwpdtj/Break2.jpg?raw=1 >>> >>> https://www.dropbox.com/s/50b1af02vcoqjgk/OnBoard.jpg?raw=1 >>> >> >> Yup, that's the plan for us too. >> >> Cheers >> >> Phil Hobbs > > Mouse bites too? That worked great.Yeah, we use that 'castellated holes' trick reasonably often for that sort of job. I learned it by examining a TMB (transfer-molded board) LED package, which uses it. (I used those TMB-packaged LEDs as the femtoamp multiplexer in my Footprints pyroelectric imagers. (If you call 96 pixels per sensor an image.) ;)> Maxim trashed us by discontinuing the MAX9690 comparator, and then > they started failing in the field after about a year. Some sort of > oxide diffusion problem. > > To be fair, they "sampled" us 3000 of the MAX9691 that we used on the > adapter boards.Like the Vogons, Maxim is/was "not actually evil, but bad-tempered, bureaucratic, officious, and callous." ;) Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
