EEVblog #1221 - Mailbag Monday

  • Published on Jun 17, 2019
  • Mailbag Monday
    Fran Blanche's Apollo DSKY T-Shirt
    Ollie: Voice control for oscilloscopes
    Using Snips:
    BreadShield Crowd Supply Project:
    Soviet era MKU-1 Calculator New-In-Box!
    Aprilog SMD test adapter
    Relay Timer design
    Vintage HP PCB's
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  • Science & TechnologyScience & Technology

Comments • 392

  • frednerks
    frednerks 4 months ago +181

    That calculator display is not bad. The silver material at the back of the display is probably barium material from the getter just like you find in audio vacuum tubes. If it is still silver it indicates that the vacuum has not escaped :) If it was white it would indicate that air had gotten inside and oxidized the barium. So the calculator is still worth fixing

    • Ratzfaz
      Ratzfaz 4 months ago

      ​@Джон Доу If such a tube releases her vacuum, you can suffocate next to the tube...
      I am glad that the transistor was invented.

    • Джон Доу
      Джон Доу 4 months ago +1

      @Ratzfaz vacuum escapes to space, as long as there's a leak - it evaporates. Everybody knows that vacuum is a liquid.

    • Landynplayz KD9NBQ
      Landynplayz KD9NBQ 4 months ago +2

      @Simon A you can't visually identify a leaking pin but you can tell if the tube has gone to air if the getter is white or if it's gassy if the tube emits a purpleish glow when operating. for voltage regulator tubes, which are cold-cathode, they're filled with neon or argon so those are supposed to glow.

    • Landynplayz KD9NBQ
      Landynplayz KD9NBQ 4 months ago

      @Ratzfaz air going in which makes it no longer a vacuum

    • Ratzfaz
      Ratzfaz 4 months ago

      ​@Landynplayz KD9NBQ if a pin leaks, do the vacuum escape ? really ? or is air going in ?

  • Max Headrom
    Max Headrom 5 days ago

    Two mics for beamforming - the module is off-the-shelf.

  • Minor League Gaming
    Minor League Gaming 2 months ago

    if anyone truely needs to ship something fragile/delicate, include a vial of olive oil in the package, and write on the package "Warning: contains Olive Oil" olive oil gets into everything if the vial is broken, and the package handlers will be more careful.

  • Destiny Fan
    Destiny Fan 3 months ago

    15:56 I would buy that programmable switch.

    • Destiny Fan
      Destiny Fan 3 months ago

      I would add more relays so it can handle higher current. So I can wire say 6-12 devices instead of 2.

  • Destiny Fan
    Destiny Fan 3 months ago

    If your hands are full why not

  • Bob
    Bob 3 months ago

    Who can help solve this mystery: why does David use a Huge sward to open the box?

  • David H. Jones
    David H. Jones 3 months ago

    I m David Jones , too,

  • Projectoxcart
    Projectoxcart 3 months ago

    I just saw this and tweeted the DSKY T-Shirt to my friend Nick Howes @Nickastronomer on twitter who has been searching for the Apollo 10 Lunar Mosule Awscent stage in solar Orbit, His friends have the Working Apollo Computer.

  • AllTheGearNoIdea
    AllTheGearNoIdea 3 months ago

    Hope your feeling better soon.

  • Ronald Youvan
    Ronald Youvan 3 months ago

    The HP digital card appears to be a video digitizer and usually it's stream would be muxed in with many more in a fiber cable channel and demuxed out at the destination. (fiber ring)
    Usually the A-D clock rate would be three times the color frequency.
    The calculator's display silver is indeed the getter in that vacuum tube.
    It is a shame that he didn't test the fuse and if good measure the power supply's output Voltage. (should be two: for the logic and for the tube {? 20 V. ?} )

  • mbaker335
    mbaker335 3 months ago

    I would love to see a Scotsman try and use the oscilloscope voice control. There is a brilliant youtube video of one trying to get his car to understand his accent and failing. BTW, good luck understanding it as well, totally incomprehensible..

  • Travis Parker
    Travis Parker 3 months ago

    They should have made the trigger phrase "Kenneth"
    "What's the frequency, Kenneth?"

  • John Coops
    John Coops 4 months ago

    Far too much time spent on boring, useless and inane commercial products.
    Arduino breakout boards.... meh, as if the world needs any more.
    That timer...fuck me, that is just shit. I know we are supposed to be kind to the speshul people, but please, think of the kittens!
    (and your poor viewers who have to endure this shit). I actually dozed off at about 20 minutes in!

  • Mike Pepper
    Mike Pepper 4 months ago

    HP board is either VME or VXI - part of a racked up test rig, maybe. Watch that ECL - I've burned my fingers on those things, they run very hot, (non saturating, power invariant output stages). ECL was the fastest logic on the planet at the time, as used in the Cray-1.

  • richfiles π
    richfiles π 4 months ago

    I got an Elektronika MKU _YEARS_ ago. Mine is all black. It shipped from Ukraine in _a burlap sack,_ and managed to make it the ENTIRE way to my door intact... Then it got knocked off the table by someone at my place 10 minutes after I received it, cracking the VFD... I was so furious! I was able to get a replacement for the VFD for very cheap. I think I only spent $15, so it wasn't too bad. It still blew me away that it could travel half way around the world in a friggin' potato sack, yet not survive the people I lived with at the time for 10 minutes! Now I can just laugh at how absurd that was! XD

  • Poor Username
    Poor Username 4 months ago

    Hi, I bought a mini-pc i found the wifi/bluetooth right next to the power button, I have ordered a metal case, What do you recommend i do with the cables, I was thinking of rotating them but their is components behind, photo link follows,

  • ZEE- Lab
    ZEE- Lab 4 months ago

    wow what a knife

  • GRBTutorials
    GRBTutorials 4 months ago

    Well, it's a bit difficult to select some measurements on my -DS1054Z- DS1104Z, so that voice control thing might come in handy... Though some quick access buttons would also be nice.

  • Chun Ho Kong
    Chun Ho Kong 4 months ago +1

    No need to put SAR in Hong Kong, just plain and simple "Hong Kong" is enough.

  • Rodrigo Andrés Beltrán Politeo

    Hey Snips! hahahah I reminds me of "Baaark, baaark" of Anti-Bark Collar from DiodeGoneWild hjahah

  • Bora Yurtoren
    Bora Yurtoren 4 months ago

    I'm sure they made an Aussie one special for you. :-)

  • Paul Spiller
    Paul Spiller 4 months ago

    When are you gonna start wearing men's size shirts? Instead you still wear kids size 7_10 years old😭🤣. I'm telling yeh? If you do the same with your Y Wams #thunder-pants, your gonna get locked up😭🤣😂😝😜🤪🤔🤭love your work

  • Thomas Kolbe
    Thomas Kolbe 4 months ago +1

    That HP board is a STM-1 (1x VC-4) SDH serial interface card of some sorts, telco stuff, my guess is that it's used to monitor the timing of the signal as it has to be pretty precise.

  • Brad Leigh's Audio Engineering Lab

    When I visited the Soviet Union in about 1987 most shops used and abacus to add up your bill so this calculator is pretty hot stuff. Like most russian stuff simple clean and overbuilt.

  • DasBreaker
    DasBreaker 4 months ago

    Dat Shirt! Applied Science anyone?

  • Rik van der Mark
    Rik van der Mark 4 months ago

    Now that Snips project is really cool. Must have been a lot of work!
    I'm impressed with how well it works. Voice recognition is more often terrible instead of usable

  • Jason Day
    Jason Day 4 months ago

    It's okay Charlie Day

  • Stuart Wilson
    Stuart Wilson 4 months ago

    Snips show channel one, and show channel six. Hey snips, sells sea shells by the snips shore.

  • volvo09
    volvo09 4 months ago

    Love the thumbnail! "Do not drop", yeah, but it doesn't say do not kick!

  • S Robins
    S Robins 4 months ago

    Good Stuff Dave I love it.

  • Viktor Evil
    Viktor Evil 4 months ago

    RC Thing is part of "К165ГФ3" - 4-phase clock generator

  • Garfish
    Garfish 4 months ago

    "What's on channel 2?"
    Sounds like something my Dad would've asked me when watching tv!

  • Raffael Loiskandl
    Raffael Loiskandl 4 months ago


  • Serg Podolnii
    Serg Podolnii 4 months ago +2

    МКУ1 means - micro-calculator universal (model 1)

  • Les Hemmings
    Les Hemmings 4 months ago

    Some disabled people would love that voice control!

  • Nicholas Brown
    Nicholas Brown 4 months ago

    IA is iowa USA

  • Suraj Grewal
    Suraj Grewal 4 months ago

    You don't have the speakers connected to voice control adaptor

  • Luka Kosanovic
    Luka Kosanovic 4 months ago

    display is fine, silver thingy is the getter compound, vacuum is ok, and the unit is probably an easy fix

  • artem65535
    artem65535 4 months ago

    2:34 Space Odyssey joke =)

  • ethanpschwartz
    ethanpschwartz 4 months ago

    Those zif sockets for your multimeter are $85. You can buy tweezers with banana plugs for $7 on Amazon.

  • tablatronix
    tablatronix 4 months ago

    Those smd sockets are crazy cool

  • Grant Rennie
    Grant Rennie 4 months ago

    11:11 IA is Iowa USA 🇺🇸

  • Ben The Shrubber
    Ben The Shrubber 4 months ago +1

    'half a puffteenth of a nanosecond'(tm)

  • Hauptwerk Hardware
    Hauptwerk Hardware 4 months ago


  • iCQ_www-SPCL-tk
    iCQ_www-SPCL-tk 4 months ago

    the +1 is for fran

  • daniturn3
    daniturn3 4 months ago

    i think in 2019 with all these mail bags think we should try and get people to package with less one use plastics and more with eco friendly packaging maybe

  • Rotten Brainz
    Rotten Brainz 4 months ago

    was that voice commander written by a femenist "hey snips" sounds suspect to me.

  • Oliver Isailovic
    Oliver Isailovic 4 months ago

    Hehehe...Cool... So cute device!!! Bravo Ollie!

  • Willy Nebula
    Willy Nebula 4 months ago

    80s electronics
    Best electronics!

  • Thorham
    Thorham 4 months ago

    Sludge on your tip... time to take a shower.

  • thekaduu
    thekaduu 4 months ago

    Hats off to the scope voice command design... But, Dave, if you are holding your tongue in the "right" angle, how can you speak clearly?

  • Shroom Duke
    Shroom Duke 4 months ago

    ...waiting for Dave to rip off the shirt exposing a rectangular chemical burn on his chest... LOL guess the shirts are chemically safe.

  • The Current Source
    The Current Source 4 months ago

    No video is complete without the Hoff

  • Martin Kuliza
    Martin Kuliza 4 months ago +1

    RE 34:12
    "Have no idea what that says"

    Hi Dave
    it says.....

    Converted from Russian Cyrillic to Latin Letters

    Pronounced as ELECTRONICA MKU1

  • Landynplayz KD9NBQ
    Landynplayz KD9NBQ 4 months ago

    what i'm thinking is that silver material is similar to the getter material in a vacuum tube. silver is good, brown means the tube is worn out, and white means it's gone to air.

  • Andy Grace
    Andy Grace 4 months ago

    Decoding something meaningful: 68K processor so I presume you merged low and high bytes from the EPROMs Dave? Remember it's Motorola and a 16 bit data bus so the code is little endian format.

  • Ilya Dorokhov
    Ilya Dorokhov 4 months ago +6

    I'm from Russia and I want this calculator fixed! Let me know if you need help with translation.
    BTW, I'm the same age as it is.

  • Andy Grace
    Andy Grace 4 months ago

    Interesting HP 68K board and the TTL->ECL logic interface card - from a late 80s/early 90s microwave link frame? 34Mbps and 140Mbps were standard trunk speeds for regional point-to-point networks. Early ATM sometimes ran at 140Mbps over fibre (instead of 155Mbps) This was state of the art in that frame relay/ATM era.

  • Simon A
    Simon A 4 months ago

    Wait!!! Not enough stuff for every week???!! I'll dig something out..

  • Captain Peroxide
    Captain Peroxide 4 months ago +3

    Next video, tearing down David Hasselhoff's blinking jacket.