On 10/1/21 12:30 PM, John Larkin wrote:> On Fri, 1 Oct 2021 09:56:01 -0700, Joerg <news@analogconsultants.com> > wrote: > >> On 9/29/21 8:48 PM, jlarkin@highlandsniptechnology.com wrote: >>> On Wed, 29 Sep 2021 22:32:23 -0400, bitrex <user@example.net> wrote: >>> >>>> On 9/29/2021 10:19 PM, jlarkin@highlandsniptechnology.com wrote: >>>>> On Tue, 28 Sep 2021 14:40:09 -0400, bitrex <user@example.net> wrote: >>>>> >>>>>> Ouch: >>>>>> >>>>>> <https://www.mouser.com/Semiconductors/Discrete-Semiconductors/Transistors/MOSFET/_/N-ax1sf?P=1yzvta6Z1yrzahtZ1yw78i4&Ns=Pricing%7c0> >>>>>> >>>>>> A lot of the inexpensive low Vgs high-voltage MOSFETs are like that, >>>>>> even singles :( >>>>> >>>>> Today's crisis: LM337 in dpak. >>>>> >>>> >>>> 500 should be showing up any second now, have someone watch the site >>>> round the clock: >>>> >>>> <https://www.mouser.com/ProductDetail/Texas-Instruments/LM337KTTRG3?qs=iSMark9AYDW%252BdGe2gQtv0A%3D%3D> >>> >>> Thanks, but that's a D2PAK. >>> >>> We might have to try to hack it in, but it looks too big. Maybe a >>> SOT-223 would work. I think we can get them. >>> >>> >> >> Chip 1 Exchange supposedly has 1787 of the LM337KVURG3 in stock but it's >> RFQ. > > Bonnie already got a quote from them. $10.13 ea for 400 pieces. >Scalper pricing, ouch. I might have to redesign another switch-mode regulator to all-discretes pretty soon. Because the IC has gone unobtainium and I no longer trust any of the different-pinout alternates in that respect. Neither does my client. Notice to youngsters: Specialize in analog. You'll have as much work as you can possibly want, and then some, for years. And I want to _really_ retire. -- Regards, Joerg http://www.analogconsultants.com/
Horrible lead times on some MOSFETs
Started by ●September 28, 2021
Reply by ●October 1, 20212021-10-01
Reply by ●October 1, 20212021-10-01
Am 01.10.21 um 21:44 schrieb Joerg:> On 10/1/21 12:14 PM, John Larkin wrote: >> On Fri, 1 Oct 2021 09:50:16 -0700, Joerg <news@analogconsultants.com> >> wrote:>>> That's already done. >>> >>> http://www.al7fs.us/AL7FS2.html >>> https://www.pixiekits.com/product/building-pixie-kit-2-video/ >>> >>> I've seen one in SMT and with just wires coming off the board. It was >>> the size of a (small) postage stamp. >> >> >> Darn. Maybe moonbounce next? >> > > We already did that almost half a century ago. That was never my thing > though. I am an HF guy and nowadays mostly CW (morse code).We used to do that when I was a student from the roof of the main building of the technical Univ Berlin with 6 Yagis. A friend of mine has now 128 Yagis at home. < http://dl7apv.de/ > I plan to do it again on 432 MHz and 10 GHz. The new digital modes with DSP lower the bar considerably.> http://www.arrl.org/files/file/Technology/tis/info/pdf/78518.pdf > > Now, Mars bounce, that would be ... but we'd first have to re-start the > Rancho Seco nuclear plant and then hold a major fund drive for the > expected electricity bills.Earth-Venus-Earth has been done by some institute in the US to create maps of Venus. That was shown in one of my FFT text books from a previous life. It has also been done by some hams here in .de from the (now museum) "Astropeiler Stockert". The transmitter was an injection-locked microwave oven magnetron IIRC. < https://astropeiler.de/ > 73, Gerhard
Reply by ●October 1, 20212021-10-01
Gerhard Hoffmann wrote:> Am 01.10.21 um 21:44 schrieb Joerg: >> On 10/1/21 12:14 PM, John Larkin wrote: >>> On Fri, 1 Oct 2021 09:50:16 -0700, Joerg <news@analogconsultants.com> >>> wrote: > >>>> That's already done. >>>> >>>> http://www.al7fs.us/AL7FS2.html >>>> https://www.pixiekits.com/product/building-pixie-kit-2-video/ >>>> >>>> I've seen one in SMT and with just wires coming off the board. It was >>>> the size of a (small) postage stamp. >>> >>> >>> Darn. Maybe moonbounce next? >>> >> >> We already did that almost half a century ago. That was never my thing >> though. I am an HF guy and nowadays mostly CW (morse code). > > We used to do that when I was a student from the roof of the main > building of the technical Univ Berlin with 6 Yagis. > A friend of mine has now 128 Yagis at home. > < http://dl7apv.de/ > > > I plan to do it again on 432 MHz and 10 GHz. The new digital modes > with DSP lower the bar considerably. > > >> http://www.arrl.org/files/file/Technology/tis/info/pdf/78518.pdf >> >> Now, Mars bounce, that would be ... but we'd first have to re-start >> the Rancho Seco nuclear plant and then hold a major fund drive for the >> expected electricity bills. > > Earth-Venus-Earth has been done by some institute in the US to create > maps of Venus. That was shown in one of my FFT text books from a > previous life.Google "Collapse of Arcibo radiotelescope" for why that won't happen again soon. :(> > It has also been done by some hams here in .de from the (now museum) > "Astropeiler Stockert". The transmitter was an injection-locked > microwave oven magnetron IIRC. > < https://astropeiler.de/ > > > 73, Gerhard >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 ●October 1, 20212021-10-01
On Fri, 1 Oct 2021 12:44:28 -0700, Joerg <news@analogconsultants.com> wrote:>On 10/1/21 12:14 PM, John Larkin wrote: >> On Fri, 1 Oct 2021 09:50:16 -0700, Joerg <news@analogconsultants.com> >> wrote: >> >>> On 9/30/21 10:02 AM, John Larkin wrote: >>>> On Wed, 29 Sep 2021 15:49:58 -0700, Joerg <news@analogconsultants.com> >>>> wrote: >>>> >>>>> On 9/29/21 3:04 PM, Phil Hobbs wrote: >>>>>> Joerg wrote: >>>>>>> On 9/29/21 1:10 PM, John Larkin wrote: >>>>>>>> On Wed, 29 Sep 2021 12:43:16 -0700, Joerg <news@analogconsultants.com> >>>>>>>> wrote: >>>>>>>> >>>>>>>>> On 9/28/21 11:40 AM, bitrex wrote: >>>>>>>>>> Ouch: >>>>>>>>>> >>>>>>>>>> <https://www.mouser.com/Semiconductors/Discrete-Semiconductors/Transistors/MOSFET/_/N-ax1sf?P=1yzvta6Z1yrzahtZ1yw78i4&Ns=Pricing%7c0> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> A lot of the inexpensive low Vgs high-voltage MOSFETs are like that, >>>>>>>>>> even singles :( >>>>>>>>>> >>>>>>>>> >>>>>>>>> Welcome to the new normal. I was yanked out of retirement a couple of >>>>>>>>> weeks ago by clients who suddenly could no longer buy this, that and >>>>>>>>> the >>>>>>>>> other part. Still working on one case. >>>>>>>>> >>>>>>>>> My assumption is that this will continue for another 2-3 years and >>>>>>>>> never >>>>>>>>> quite settle back to the "good old days". Then again, it's often the >>>>>>>>> same with lawn mower parts, toilet paper, ... >>>>>>>> >>>>>>>> The pattern is >>>>>>>> >>>>>>>> Shortage, real or not. >>>>>>>> >>>>>>>> Panic. >>>>>>>> >>>>>>> >>>>>>> That and the fear of Bidenflation. Next year the same chip could cost >>>>>>> 20% more. >>>>>>> >>>>>>> >>>>>>>> Multiple over-buying. >>>>>>>> >>>>>>>> Ramp up production. >>>>>>>> >>>>>>>> Glut. Garages full of toilet paper. >>>>>>>> >>>>>>> >>>>>>> I know a guy who has four (!) bulk packages in his walk-in closet. >>>>>>> >>>>>>> >>>>>>>> The semi industry does this pattern now and then. >>>>>>>> >>>>>>> >>>>>>> This time it's more serious. There are parts my clients need that have >>>>>>> the next scheduled delivery in December 2022. And even then there is a >>>>>>> substantial risk that they'd get blown out of the water a month before >>>>>>> via an "Oh, so sorry" email. Which just happened to one of my clients >>>>>>> so I might get to do a redesign of a perfectly fine circuit. >>>>>>> >>>>>> >>>>>> Well, it's good to exercise more than your legs. ;) >>>>>> >>>>> >>>>> Yes, but the plan was to invest my brain exercises in my newly rekindled >>>>> hobby of ham radio. So many ideas, so much stuff to build, but not much >>>>> time (yet). >>>> >>>> Maybe build the world's smallest HF transceiver. Under a square inch >>>> maybe. >>>> >>> >>> That's already done. >>> >>> http://www.al7fs.us/AL7FS2.html >>> https://www.pixiekits.com/product/building-pixie-kit-2-video/ >>> >>> I've seen one in SMT and with just wires coming off the board. It was >>> the size of a (small) postage stamp. >> >> >> Darn. Maybe moonbounce next? >> > >We already did that almost half a century ago. That was never my thing >though. I am an HF guy and nowadays mostly CW (morse code).Mo is a speech pathologist. She has worked with old guys who couldn't talk but could still communicate in morse code. I could never learn it myself, so I never got a ham license.> >http://www.arrl.org/files/file/Technology/tis/info/pdf/78518.pdf > >Now, Mars bounce, that would be ... but we'd first have to re-start the >Rancho Seco nuclear plant and then hold a major fund drive for the >expected electricity bills.This was the first moonbounce: https://www.dropbox.com/s/67foxzuqp8pnx6b/MoonBounce.JPG?dl=0 I think marsbounce has been done. -- 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 ●October 1, 20212021-10-01
Am 02.10.21 um 01:35 schrieb Phil Hobbs:>> Earth-Venus-Earth has been done by some institute in the US to create >> maps of Venus. That was shown in one of my FFT text books from a >> previous life. > > Google "Collapse of Arcibo radiotelescope" for why that won't happen > again soon. :(No, that wasn't Arecibo, the name was Greystone radar or Greenstone or st. like that. The text included how they spent half an hour to burn the waveguides empty before the experiments. That does not really belong into an FFT text book, but one could feel the author's enthusiasm. BTW the FFT came into play because Venus rotates, albeit slooowly, probably a Doppler thing, I don't remember. The pics were disappointing by today's standards. BTW the Chinese now have some Arecibo++.>> 73, Gerhard
Reply by ●October 2, 20212021-10-02
On 10/1/2021 2:44 PM, Joerg wrote:> On 10/1/21 12:14 PM, John Larkin wrote: >> On Fri, 1 Oct 2021 09:50:16 -0700, Joerg <news@analogconsultants.com> >> wrote: >> >>> On 9/30/21 10:02 AM, John Larkin wrote: >>>> On Wed, 29 Sep 2021 15:49:58 -0700, Joerg <news@analogconsultants.com> >>>> wrote: >>>> >>>>> On 9/29/21 3:04 PM, Phil Hobbs wrote: >>>>>> Joerg wrote: >>>>>>> On 9/29/21 1:10 PM, John Larkin wrote: >>>>>>>> On Wed, 29 Sep 2021 12:43:16 -0700, Joerg >>>>>>>> <news@analogconsultants.com> >>>>>>>> wrote: >>>>>>>> >>>>>>>>> On 9/28/21 11:40 AM, bitrex wrote: >>>>>>>>>> Ouch: >>>>>>>>>> >>>>>>>>>> <https://www.mouser.com/Semiconductors/Discrete-Semiconductors/Transistors/MOSFET/_/N-ax1sf?P=1yzvta6Z1yrzahtZ1yw78i4&Ns=Pricing%7c0> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> A lot of the inexpensive low Vgs high-voltage MOSFETs are like >>>>>>>>>> that, >>>>>>>>>> even singles :( >>>>>>>>>> >>>>>>>>> >>>>>>>>> Welcome to the new normal. I was yanked out of retirement a >>>>>>>>> couple of >>>>>>>>> weeks ago by clients who suddenly could no longer buy this, >>>>>>>>> that and >>>>>>>>> the >>>>>>>>> other part. Still working on one case. >>>>>>>>> >>>>>>>>> My assumption is that this will continue for another 2-3 years and >>>>>>>>> never >>>>>>>>> quite settle back to the "good old days". Then again, it's >>>>>>>>> often the >>>>>>>>> same with lawn mower parts, toilet paper, ... >>>>>>>> >>>>>>>> The pattern is >>>>>>>> >>>>>>>> Shortage, real or not. >>>>>>>> >>>>>>>> Panic. >>>>>>>> >>>>>>> >>>>>>> That and the fear of Bidenflation. Next year the same chip could >>>>>>> cost >>>>>>> 20% more. >>>>>>> >>>>>>> >>>>>>>> Multiple over-buying. >>>>>>>> >>>>>>>> Ramp up production. >>>>>>>> >>>>>>>> Glut. Garages full of toilet paper. >>>>>>>> >>>>>>> >>>>>>> I know a guy who has four (!) bulk packages in his walk-in closet. >>>>>>> >>>>>>> >>>>>>>> The semi industry does this pattern now and then. >>>>>>>> >>>>>>> >>>>>>> This time it's more serious. There are parts my clients need that >>>>>>> have >>>>>>> the next scheduled delivery in December 2022. And even then there >>>>>>> is a >>>>>>> substantial risk that they'd get blown out of the water a month >>>>>>> before >>>>>>> via an "Oh, so sorry" email. Which just happened to one of my >>>>>>> clients >>>>>>> so I might get to do a redesign of a perfectly fine circuit. >>>>>>> >>>>>> >>>>>> Well, it's good to exercise more than your legs. ;) >>>>>> >>>>> >>>>> Yes, but the plan was to invest my brain exercises in my newly >>>>> rekindled >>>>> hobby of ham radio. So many ideas, so much stuff to build, but not >>>>> much >>>>> time (yet). >>>> >>>> Maybe build the world's smallest HF transceiver. Under a square inch >>>> maybe. >>>> >>> >>> That's already done. >>> >>> http://www.al7fs.us/AL7FS2.html >>> https://www.pixiekits.com/product/building-pixie-kit-2-video/ >>> >>> I've seen one in SMT and with just wires coming off the board. It was >>> the size of a (small) postage stamp. >> >> >> Darn. Maybe moonbounce next? >> > > We already did that almost half a century ago. That was never my thing > though. I am an HF guy and nowadays mostly CW (morse code).I've been on VHF/UHF voice for the last 60 years but I'm getting a hankerin' to get on HF again. I got my General in 1958 when we had to go downtown to the FCC office for the test. I could do 15 WPM back then but can manage only 3-5WPM now(maybe). I have a homebrew half-watt transceiver for 7.04MHz. I know it works but never transmitted with it. It will warm up a small dummy load though. My call is KD5YI.> http://www.arrl.org/files/file/Technology/tis/info/pdf/78518.pdf > > Now, Mars bounce, that would be ... but we'd first have to re-start the > Rancho Seco nuclear plant and then hold a major fund drive for the > expected electricity bills. >
Reply by ●October 2, 20212021-10-02
On a sunny day (Fri, 1 Oct 2021 12:44:28 -0700) it happened Joerg <news@analogconsultants.com> wrote in <irp6osFspfdU1@mid.individual.net>:>Now, Mars bounce, that would be ... but we'd first have to re-start the >Rancho Seco nuclear plant and then hold a major fund drive for the >expected electricity bills.Joerg how about controlling that mars helicopter? I think a replay attack may work :-) China you have not seen this posting..
Reply by ●October 2, 20212021-10-02
On Tue, 28 Sep 2021 14:40:09 -0400, bitrex <user@example.net> wrote:>Ouch: > ><https://www.mouser.com/Semiconductors/Discrete-Semiconductors/Transistors/MOSFET/_/N-ax1sf?P=1yzvta6Z1yrzahtZ1yw78i4&Ns=Pricing%7c0> > >A lot of the inexpensive low Vgs high-voltage MOSFETs are like that, >even singles :(I just designed a gadget with an 8.7 volt SMB zener, in an emergency clamp circuit. But nobody has any. Looks like we can nab a reel of SOD123 parts, and push the power dissipation a tad. Lots of copper on the ends. -- Father Brown's figure remained quite dark and still; but in that instant he had lost his head. His head was always most valuable when he had lost it.
Reply by ●October 2, 20212021-10-02
On Saturday, 2 October 2021 at 00:47:10 UTC+1, John Larkin wrote:> I could never learn it myself, so I never got a ham license.I never got a ham license, I stuck to ploughmans.
Reply by ●October 4, 20212021-10-04
On 10/1/21 10:10 PM, John S wrote:> On 10/1/2021 2:44 PM, Joerg wrote: >> On 10/1/21 12:14 PM, John Larkin wrote: >>> On Fri, 1 Oct 2021 09:50:16 -0700, Joerg <news@analogconsultants.com> >>> wrote: >>> >>>> On 9/30/21 10:02 AM, John Larkin wrote: >>>>> On Wed, 29 Sep 2021 15:49:58 -0700, Joerg <news@analogconsultants.com> >>>>> wrote: >>>>> >>>>>> On 9/29/21 3:04 PM, Phil Hobbs wrote: >>>>>>> Joerg wrote: >>>>>>>> On 9/29/21 1:10 PM, John Larkin wrote: >>>>>>>>> On Wed, 29 Sep 2021 12:43:16 -0700, Joerg >>>>>>>>> <news@analogconsultants.com> >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> On 9/28/21 11:40 AM, bitrex wrote: >>>>>>>>>>> Ouch: >>>>>>>>>>> >>>>>>>>>>> <https://www.mouser.com/Semiconductors/Discrete-Semiconductors/Transistors/MOSFET/_/N-ax1sf?P=1yzvta6Z1yrzahtZ1yw78i4&Ns=Pricing%7c0> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> A lot of the inexpensive low Vgs high-voltage MOSFETs are >>>>>>>>>>> like that, >>>>>>>>>>> even singles :( >>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Welcome to the new normal. I was yanked out of retirement a >>>>>>>>>> couple of >>>>>>>>>> weeks ago by clients who suddenly could no longer buy this, >>>>>>>>>> that and >>>>>>>>>> the >>>>>>>>>> other part. Still working on one case. >>>>>>>>>> >>>>>>>>>> My assumption is that this will continue for another 2-3 years >>>>>>>>>> and >>>>>>>>>> never >>>>>>>>>> quite settle back to the "good old days". Then again, it's >>>>>>>>>> often the >>>>>>>>>> same with lawn mower parts, toilet paper, ... >>>>>>>>> >>>>>>>>> The pattern is >>>>>>>>> >>>>>>>>> Shortage, real or not. >>>>>>>>> >>>>>>>>> Panic. >>>>>>>>> >>>>>>>> >>>>>>>> That and the fear of Bidenflation. Next year the same chip could >>>>>>>> cost >>>>>>>> 20% more. >>>>>>>> >>>>>>>> >>>>>>>>> Multiple over-buying. >>>>>>>>> >>>>>>>>> Ramp up production. >>>>>>>>> >>>>>>>>> Glut. Garages full of toilet paper. >>>>>>>>> >>>>>>>> >>>>>>>> I know a guy who has four (!) bulk packages in his walk-in closet. >>>>>>>> >>>>>>>> >>>>>>>>> The semi industry does this pattern now and then. >>>>>>>>> >>>>>>>> >>>>>>>> This time it's more serious. There are parts my clients need >>>>>>>> that have >>>>>>>> the next scheduled delivery in December 2022. And even then >>>>>>>> there is a >>>>>>>> substantial risk that they'd get blown out of the water a month >>>>>>>> before >>>>>>>> via an "Oh, so sorry" email. Which just happened to one of my >>>>>>>> clients >>>>>>>> so I might get to do a redesign of a perfectly fine circuit. >>>>>>>> >>>>>>> >>>>>>> Well, it's good to exercise more than your legs. ;) >>>>>>> >>>>>> >>>>>> Yes, but the plan was to invest my brain exercises in my newly >>>>>> rekindled >>>>>> hobby of ham radio. So many ideas, so much stuff to build, but not >>>>>> much >>>>>> time (yet). >>>>> >>>>> Maybe build the world's smallest HF transceiver. Under a square inch >>>>> maybe. >>>>> >>>> >>>> That's already done. >>>> >>>> http://www.al7fs.us/AL7FS2.html >>>> https://www.pixiekits.com/product/building-pixie-kit-2-video/ >>>> >>>> I've seen one in SMT and with just wires coming off the board. It was >>>> the size of a (small) postage stamp. >>> >>> >>> Darn. Maybe moonbounce next? >>> >> >> We already did that almost half a century ago. That was never my thing >> though. I am an HF guy and nowadays mostly CW (morse code). > > I've been on VHF/UHF voice for the last 60 years but I'm getting a > hankerin' to get on HF again. I got my General in 1958 when we had to go > downtown to the FCC office for the test. I could do 15 WPM back then but > can manage only 3-5WPM now(maybe).I was like that last year because of a 35 year absence from ham radio. Didn't even remember some letters, embarrassing. I had to claw my way back up and for a guy with zero musical talent that's a hard slog. Now I am at 20wpm but my goal is 25-30wpm because that makes ragchews more fun. Some CW chats are 1/2 hour or more and those are the most fun. No contests here, I don't like those anymore.> ... I have a homebrew half-watt > transceiver for 7.04MHz. I know it works but never transmitted with it. > It will warm up a small dummy load though. My call is KD5YI. >Hang a dipole and fire it up. 7.040 is fine, hoping you can pull that crystal a few kHz if needed. I am planning to use a QCX Mini soon which is 4-5W and costs less than $100 with enclosure. My call sign is AJ6QL. If you ever want to try email me. [...] -- Regards, Joerg http://www.analogconsultants.com/
