#eevblog - 2019-08-15 - AustNet Archive Project

// #eevblog — 2019-08-15

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« 2019-08-14 2019-08-16 »
11:45 Topic Is: Official IRC channel of the EEVBlog - www.eevblog.com
11:45 Set By: (Halcyon) on: Mon Dec 17 17:18:40 2018
11:45 <T3sl4> several BATxx series diodes are fine
11:45 <DHess_US> Yea, or the 1N5711 was commonly used in the past or the various HP diodes which are now discontinued. Fuck you Broadcom.
11:45 <DHess_US> When complexity is not a problem, then I like using bipolar transistors.
11:45 <T3sl4> BAS70 is almost as small
11:45 <ziga> hmk
11:45 <ziga> i'll order some 74LVC8T245
11:45 <ziga> they're not that expensive
11:45 <ziga> the expensive thing is the microscope i have to buy to be able to solder it
11:45 <ziga> T3sl4: haha, someone did the job already -> https://next-hack.com/index.php/2017/09/15/how-to-interface-a-5v-output-to-a-3-3v-input/
11:45 <ziga> he listed all the possible solutions to achieve a 5v<->3.3v translation
11:45 <ziga> with pro and cons
11:45 <T3sl4> yup
11:45 <DHess_US> Wow, he even covered the bipolar cascode.
11:45 <T3sl4> the BJT drops 0.7V so basically isn't useful; you should have a series resistor between the limiter and the input pin, to limit any remaining current into the ESD diodes
11:45 <T3sl4> the zener is even worse because a "3.3V" zener might drop 2.5V at signal currents, or 5-7V under surge conditions
11:45 <DHess_US> Ideally, and this is how I've done it in the past, a second BJT is used to set the bias to the base of the first one so limiting occurs at the difference in Vbe which is small.
11:45 <DHess_US> Or two diodes can be used in the same way but BJTs work better.
11:45 <DHess_US> Which brings up the method he did *not* show ... diode bridge.
11:45 <DHess_US> Really should have included the two diode or two BJT methods instead of just mentioning them.
11:45 <DHess_US> Also should have included the comparator method since they have gotten so cheap.
11:45 <ziga> btw how do you store your components ?
11:45 <ziga> i'm considering building a new desk with integrated trays (connected, to a database with leds helping to find the right slots)
11:45 <ziga> https://scontent-cdt1-1.xx.fbcdn.net/v/t1.0-9/67438542_10157030238750642_8563285745857462272_o.jpg?_nc_cat=106&_nc_oc=AQmjr5zDnKzmhbzs3p3ivWi-cjZcTyPVUeL-rzJ5b08oWjqPWETzK8PUlaa4ytFR53o&_nc_ht=scontent-cdt1-1.xx&oh=7e76b05e3c3a87c3c84c9bf429e55fac&oe=5E160361
11:45 <ziga> err, that was long.
11:45 <ziga> https://scontent-cdt1-1.xx.fbcdn.net/v/t1.0-9/67757358_10157030237825642_417529125352243200_o.jpg?_nc_cat=106&_nc_oc=AQmoSO2qSIJcLpm3LXAf42KG_weob2itR8icisgJ71HxVDg-Qlx3PQnnxtwc06MpkLE&_nc_ht=scontent-cdt1-1.xx&oh=d18efebd144db9ad8464b6079c1b82d7&oe=5DC807B2
11:45 <ziga> can you access the links ?
11:45 <ziga> not sure if they're protected or not, works in incognito mode.
11:45 <ziga> https://imgur.com/a/ExoBpi6
11:45 <ziga> just uploaded them all on imgur
11:45 <T3sl4> DHess_US: yeah, and with a base bias you can use one common to all which is nice
11:45 <T3sl4> ziga: neat
11:45 <ziga> i didn't finish drawing the left part where the lab hardware should fit, they will be higher so that it will be easier to work with the probes, and there will be a DIN rail at the bottom instead.
11:45 <DHess_US> You can buy polypropylene parts storage boxes with internal dividers which are pretty nice. For things which comes in decade values like resistors and capacitors, I prefer the wide Akro Mills cabinets.
11:45 Quit: narayan ([email protected]) [Quit: leaving]
11:45 Quit: mbrumlow ([email protected]) [Quit: http://www.kiwiirc.com/ - A hand crafted IRC client]
11:45 Join: mbrumlow ([email protected]) to #EEVblog
11:45 <EEVBlog> New EEVBlog Tweet: Vion video coming shortly, it's just processing. I redid it to both add some stuff plus shave about 6 minutes off the run time. I hit the magical 3X:XXmin mark instead of 4X:XXmin (it matters subconsciously)
11:45 <EEVBlog> New EEVBlog Tweet: HOLD MY BEER GoFundMe coming shortly... NASA Giving Away Apollo-Era Saturn Rocket to Anyone who can Carry it Out https://t.co/2dzaAoIhwu
11:45 Join: narayan ([email protected]) to #EEVblog
11:45 <EEVBlog> New EEVBlog Tweet: Betcha @elonmusk nabs this for shits and giggles. https://t.co/2dzaAoIhwu
11:45 Quit: Stiff ([email protected]) [serviceshub.austnet.org onacloud.vic.au.austnet.org]
11:45 Quit: pakesson ([email protected]) [serviceshub.austnet.org onacloud.vic.au.austnet.org]
11:45 <EEVBlog> New EEVBlog Tweet: An "Engineered Timber" commercial office building? https://t.co/qNGEgm6j3y
11:45 Join: pakesson ([email protected]) to #EEVblog
11:45 Join: Stiff ([email protected]) to #EEVblog
11:45 <EEVBlog> New EEVBlog Tweet: NEW EEVblog Video! EEVblog #1238 - Vion: The World's Worst Multimeter! https://t.co/gtD6cCyiRL
11:45 <EEVBlog> New EEVBlog Tweet: RT @HolgerMBGL: Solar cyclepath in Germany keeps close. @eevblog https://t.co/0Rj5QMKM6j
11:45 Quit: coppice ([email protected]) [Ping timeout: 121 seconds]
11:45 Join: coppice ([email protected]) to #EEVblog
40:39 Join: DogWomble ([email protected]) to #EEVblog
40:39 Mode: (by ChanOP) +o DogWomble
25:41 Join: guardeiro ([email protected]) to #EEVblog
25:57 <guardeiro> hello
25:58 <EEVBlog> Hello there, guardeiro!
27:09 <guardeiro> i got myself a machxo3 starter kit from lattice and was wondering if the IO were 5v compatible. but im unable to find anything in the datasheets...
28:05 <guardeiro> nevermind
28:27 <guardeiro> there are internal pullup registers in the fpga
52:41 <Halcyon> Hey all
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