Murata makes some cool converters, with a ferrite toroid embedded in the PCB, with windings made of traces and vias. https://www.dropbox.com/sh/lp9lb68pg3dohfa/AACLemXklO6JCdQRebMu1Vm6a?dl=0 Recom has some new parts, similar but they use a conventional wound transformer. https://www.dropbox.com/sh/thwbtq5mswzllg7/AACQQkqKd2XLj-MgWGonUd5Ia?dl=0 Both have standard footprints. The Muratas specify 2.5 pF isolation capacitance, and the Recoms spec 75 max.
new dc/dc converters
Started by ●September 27, 2022
Reply by ●September 27, 20222022-09-27
John Larkin wrote:> > Murata makes some cool converters, with a ferrite toroid embedded in > the PCB, with windings made of traces and vias. > > https://www.dropbox.com/sh/lp9lb68pg3dohfa/AACLemXklO6JCdQRebMu1Vm6a?dl=0 > > Recom has some new parts, similar but they use a conventional wound > transformer. > > https://www.dropbox.com/sh/thwbtq5mswzllg7/AACQQkqKd2XLj-MgWGonUd5Ia?dl=0 > > Both have standard footprints. > > The Muratas specify 2.5 pF isolation capacitance, and the Recoms spec > 75 max. >We use the Muratas a lot, both 1W and 2W varieties. They're pretty inoffensive from an EMI point of view, which is a big win. The Recoms look as though they're also toroids, but I can't tell from the photos or the datasheet. Since custom packaging has become much cheaper, we're now using a combination of solid brass machined parts, 3-D printing, and laser cut sheet brass faceplates, e.g. these ones: <https://hobbs-eo.com>. The supplies go in the black plastic part and the photoreceiver inside the brass box, communicating via feedthrough caps in the old-school way. Bling bling! 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 ●September 27, 20222022-09-27
On Tue, 27 Sep 2022 14:38:11 -0400, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:>John Larkin wrote: >> >> Murata makes some cool converters, with a ferrite toroid embedded in >> the PCB, with windings made of traces and vias. >> >> https://www.dropbox.com/sh/lp9lb68pg3dohfa/AACLemXklO6JCdQRebMu1Vm6a?dl=0 >> >> Recom has some new parts, similar but they use a conventional wound >> transformer. >> >> https://www.dropbox.com/sh/thwbtq5mswzllg7/AACQQkqKd2XLj-MgWGonUd5Ia?dl=0 >> >> Both have standard footprints. >> >> The Muratas specify 2.5 pF isolation capacitance, and the Recoms spec >> 75 max. >> > >We use the Muratas a lot, both 1W and 2W varieties. They're pretty >inoffensive from an EMI point of view, which is a big win. > >The Recoms look as though they're also toroids, but I can't tell from >the photos or the datasheet. > >Since custom packaging has become much cheaper, we're now using a >combination of solid brass machined parts, 3-D printing, and laser cut >sheet brass faceplates, e.g. these ones: > ><https://hobbs-eo.com>. > >The supplies go in the black plastic part and the photoreceiver inside >the brass box, communicating via feedthrough caps in the old-school way. > Bling bling!Gold plate it! (Mo and I have been playing with gold leaf lately.)> >Cheers > >Phil HobbsWe finally gave up on the dreadful Hammond boxes and custom labels. We have our own extrusions, blue anodized, and blast all the artwork with a Boss laser. https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0 This gets us better EMI and some conduction cooling too. Top and bottom both come off, which is handy when we have parts on both sides of the board.
Reply by ●September 28, 20222022-09-28
On a sunny day (Tue, 27 Sep 2022 12:44:27 -0700) it happened John Larkin <jlarkin@highland_atwork_technology.com> wrote in <cpi6jhp2rui2013ud74ih85ncn8cjmhkn8@4ax.com>:>We finally gave up on the dreadful Hammond boxes and custom labels. We >have our own extrusions, blue anodized, and blast all the artwork with >a Boss laser. > >https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0 > >This gets us better EMI and some conduction cooling too. Top and >bottom both come off, which is handy when we have parts on both sides >of the board.Makes a bad impression I would like connectors fixed mechanically to the front panel as this way any forces are directly passed to the peeseebee. The trimmer holes look similary shit The trimmer texts are vertical, try w i d t h back to the drawing board. Do you guys do anything with 3D printing or metal 3D printing?
Reply by ●September 28, 20222022-09-28
On Wed, 28 Sep 2022 04:56:06 GMT, Jan Panteltje <pNaonStpealmtje@yahoo.com> wrote:>On a sunny day (Tue, 27 Sep 2022 12:44:27 -0700) it happened John Larkin ><jlarkin@highland_atwork_technology.com> wrote in ><cpi6jhp2rui2013ud74ih85ncn8cjmhkn8@4ax.com>: > >>We finally gave up on the dreadful Hammond boxes and custom labels. We >>have our own extrusions, blue anodized, and blast all the artwork with >>a Boss laser. >> >>https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0 >> >>This gets us better EMI and some conduction cooling too. Top and >>bottom both come off, which is handy when we have parts on both sides >>of the board. > >Makes a bad impression >I would like connectors fixed mechanically to the front panel >as this way any forces are directly passed to the peeseebee.Think about the forces when the connector is fastened to the panel.>The trimmer holes look similary shit >The trimmer texts are vertical, try >w >i >d >t >h > >back to the drawing board.Feel free to not buy any. We don't mind. Show us some of your products.> >Do you guys do anything with 3D printing or metal 3D printing?Plastic 3D for some test fixtures. Actually, machining usually makes more sense.
Reply by ●September 28, 20222022-09-28
Jan Panteltje wrote:> John Larkin wrote: > >>We finally gave up on the dreadful Hammond boxes and custom labels. We >>have our own extrusions, blue anodized, and blast all the artwork with >>a Boss laser. >> >>https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0 >> >>This gets us better EMI and some conduction cooling too. Top and >>bottom both come off, which is handy when we have parts on both sides >>of the board. > > Makes a bad impression > I would like connectors fixed mechanically to the front panel > as this way any forces are directly passed to the peeseebee. > The trimmer holes look similary shit > The trimmer texts are vertical, try > w > i > d > t > h > > back to the drawing board. > > Do you guys do anything with 3D printing or metal 3D printing?A horrific sight to behold. Nonetheless, it's good enough for government work. On the other hand, companies who manufacture consumer products must put more thought into design language: <https://paia.com/> A couple of years ago Larkin bad-mouthed PAIA's engineers because they used pots in their legacy design: <https://crcomp.net/paia/4720.png> Danke, -- Don, KB7RPU, https://www.qsl.net/kb7rpu There was a young lady named Bright Whose speed was far faster than light; She set out one day In a relative way And returned on the previous night.
Reply by ●September 28, 20222022-09-28
On a sunny day (Wed, 28 Sep 2022 16:19:14 -0000 (UTC)) it happened "Don" <g@crcomp.net> wrote in <20220928a@crcomp.net>:>Jan Panteltje wrote: >> John Larkin wrote: >> >>>We finally gave up on the dreadful Hammond boxes and custom labels. We >>>have our own extrusions, blue anodized, and blast all the artwork with >>>a Boss laser. >>> >>>https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0 >>> >>>This gets us better EMI and some conduction cooling too. Top and >>>bottom both come off, which is handy when we have parts on both sides >>>of the board. >> >> Makes a bad impression >> I would like connectors fixed mechanically to the front panel >> as this way any forces are directly passed to the peeseebee. >> The trimmer holes look similary shit >> The trimmer texts are vertical, try >> w >> i >> d >> t >> h >> >> back to the drawing board. >> >> Do you guys do anything with 3D printing or metal 3D printing? > >A horrific sight to behold. Nonetheless, it's good enough for government >work. > >On the other hand, companies who manufacture consumer products must put >more thought into design language: <https://paia.com/> > A couple of years ago Larkin bad-mouthed PAIA's engineers because >they used pots in their legacy design: <https://crcomp.net/paia/4720.png>Nice! A real UJT as oscillator, I still have some from ebay .. sine out, wonder about the harmonics... Well that is the intension... :-)
Reply by ●September 28, 20222022-09-28
On a sunny day (Wed, 28 Sep 2022 07:39:04 -0700) it happened John Larkin <jlarkin@highlandSNIPMEtechnology.com> wrote in <8qm8jh9oaked9p4mh4jbumqdd0ict06n5j@4ax.com>:>On Wed, 28 Sep 2022 04:56:06 GMT, Jan Panteltje ><pNaonStpealmtje@yahoo.com> wrote: > >>On a sunny day (Tue, 27 Sep 2022 12:44:27 -0700) it happened John Larkin >><jlarkin@highland_atwork_technology.com> wrote in >><cpi6jhp2rui2013ud74ih85ncn8cjmhkn8@4ax.com>: >> >>>We finally gave up on the dreadful Hammond boxes and custom labels. We >>>have our own extrusions, blue anodized, and blast all the artwork with >>>a Boss laser. >>> >>>https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0 >>> >>>This gets us better EMI and some conduction cooling too. Top and >>>bottom both come off, which is handy when we have parts on both sides >>>of the board. >> >>Makes a bad impression >>I would like connectors fixed mechanically to the front panel >>as this way any forces are directly passed to the peeseebee. > >Think about the forces when the connector is fastened to the panel.Those are controlled by you during assembly, but you never met Big Joe who can turn anything past breakpoint,..>>The trimmer holes look similary shit >>The trimmer texts are vertical, try >>w >>i >>d >>t >>h >> >>back to the drawing board. > >Feel free to not buy any. We don't mind.Freedom!!! Mr Hobbs is selling quantum light detectors for 1200 $ ?? Did you read this: https://www.space.com/jupiter-photo-most-detailed-by-photographer I followed all the links and postings to get the details.>Show us some of your products.1*2=2 4*3=12 2*5=10 The rest is now classified but will be used against the US if they keep destroying pipelines.>> >>Do you guys do anything with 3D printing or metal 3D printing? > >Plastic 3D for some test fixtures. Actually, machining usually makes >more sense.If you can do it with a lathe, yes perhaps. There is a company that makes whole rocket engines using metal 3D printing https://www.relativityspace.com/> > >
Reply by ●September 28, 20222022-09-28
On Wed, 28 Sep 2022 16:19:14 -0000 (UTC), "Don" <g@crcomp.net> wrote:>Jan Panteltje wrote: >> John Larkin wrote: >> >>>We finally gave up on the dreadful Hammond boxes and custom labels. We >>>have our own extrusions, blue anodized, and blast all the artwork with >>>a Boss laser. >>> >>>https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0 >>> >>>This gets us better EMI and some conduction cooling too. Top and >>>bottom both come off, which is handy when we have parts on both sides >>>of the board. >> >> Makes a bad impression >> I would like connectors fixed mechanically to the front panel >> as this way any forces are directly passed to the peeseebee. >> The trimmer holes look similary shit >> The trimmer texts are vertical, try >> w >> i >> d >> t >> h >> >> back to the drawing board. >> >> Do you guys do anything with 3D printing or metal 3D printing? > >A horrific sight to behold. Nonetheless, it's good enough for government >work. > >On the other hand, companies who manufacture consumer products must put >more thought into design language: <https://paia.com/> > A couple of years ago Larkin bad-mouthed PAIA's engineers because >they used pots in their legacy design: <https://crcomp.net/paia/4720.png> > >Danke,Pots are a bad, expensive substitute for managing tolerances and betas and quiescent currents and such. Sometimes they are great for calibration, especially for fast stuff.
Reply by ●September 28, 20222022-09-28
onsdag den 28. september 2022 kl. 21.39.47 UTC+2 skrev John Larkin:> On Wed, 28 Sep 2022 16:19:14 -0000 (UTC), "Don" <g...@crcomp.net> wrote: > > >Jan Panteltje wrote: > >> John Larkin wrote: > >> > >>>We finally gave up on the dreadful Hammond boxes and custom labels. We > >>>have our own extrusions, blue anodized, and blast all the artwork with > >>>a Boss laser. > >>> > >>>https://www.dropbox.com/sh/cfnhhynh6p3auxf/AACPOsScNGmuH1lAlNCPmSdGa?dl=0 > >>> > >>>This gets us better EMI and some conduction cooling too. Top and > >>>bottom both come off, which is handy when we have parts on both sides > >>>of the board. > >> > >> Makes a bad impression > >> I would like connectors fixed mechanically to the front panel > >> as this way any forces are directly passed to the peeseebee. > >> The trimmer holes look similary shit > >> The trimmer texts are vertical, try > >> w > >> i > >> d > >> t > >> h > >> > >> back to the drawing board. > >> > >> Do you guys do anything with 3D printing or metal 3D printing? > > > >A horrific sight to behold. Nonetheless, it's good enough for government > >work. > > > >On the other hand, companies who manufacture consumer products must put > >more thought into design language: <https://paia.com/> > > A couple of years ago Larkin bad-mouthed PAIA's engineers because > >they used pots in their legacy design: <https://crcomp.net/paia/4720.png> > > > >Danke, > Pots are a bad, expensive substitute for managing tolerances and betas > and quiescent currents and such. Sometimes they are great for > calibration, especially for fast stuff.Motec "ScrewDriver ECU" from sometime in the 80's: https://imgur.com/dUMo3sS
