EEVblog: The 555 Timer is 55 years old

(youtube.com)

119 points | by brudgers 3 hours ago

16 comments

  • darrinm 8 minutes ago
    As a kid I didn’t understand what the 555 timer chip on the Apple II disk controller was doing but I learned the hard way that when you misalign the pins on the drive connector cable and the 555 chip releases its blue smoke you can’t use the drive anymore :(
  • 3form 2 hours ago
    5:55 video released on May 5th, as per description :)

    For something feeling like a fairly specific IC, I remember seeing many projects that use it throughout the years in wacky ways - and seeing it makes me happy to know that the sentiment for this little piece is shared.

    • regularfry 50 minutes ago
      The trick is that it's sold as a timer but it's really a kit of parts from which you happen to be able to build a timer.

      There's a lesson in there somewhere.

    • FarmerPotato 1 hour ago
      Two videos tomorrow at 5:56!
      • zephen 47 minutes ago
        That's fine, but you know you have to concatenate them and sell them as one unit, right?
  • Etoro2024 5 minutes ago
    I used to get exited about this. Hahaha I think I miss those days.
  • longwave 1 hour ago
    Big Clive is currently livestreaming to celebrate the 555's birthday: https://www.youtube.com/watch?v=jzNjFJdaw_I
  • tuvix 2 hours ago
    Built an atari punk console using these with my late father. Still have it hanging on my wall in a shadow box.
    • swed420 1 hour ago
      I recently dug one out to use as a hardware shutdown timer to power off an rpi's PSU once it has presumably halted without having to resort to a dedicated MCU for the task.
  • davidwritesbugs 2 hours ago
    Oh god I feel old. I remember being an excited schoolboy thinking how magic this was when it debuted.
    • davidwritesbugs 2 hours ago
      I also remember being amazed, and did a forehead slap, when an old army bomb disposal man explained how, what I thought was an innocent device, was used by the IRA in bombs.
      • nickcw 1 hour ago
        Ha. When I was a teenager I used to build 555s into timers for the same purpose using a no PCB rats nest construction.

        Though surprising the family at dinner with a small explosion was a much more innocent purpose.

    • Brian_K_White 1 hour ago
      For me that is blue leds.
      • davidwritesbugs 48 minutes ago
        Yes! I remember thinking "damn you band gap physics, if we only had blue leds we could do colour displays with LEDs, but that can never happen."
  • pryelluw 44 minutes ago
    Back when radio shack still existed I would buy a 555 timer during every visit. I live collecting them and still have a bunch somewhere stored. I continue to do it with the 328p arduino boards as well whenever I visit my local microcenter.
  • SoleilAbsolu 1 hour ago
    I still have the Forrest Mims III Radio Shack "555 Engineer's Mini-Notebook" somewhere in my basement. And rumor has it that Sammy Hagar can't drive 555 because his car just isn't fast enough!
    • MisterTea 33 minutes ago
      The Mims books are fantastic. As a kid I collected every mini notebook and the green Radio Shack "Getting Started in Electronics." They were my intro to electronics along with the Radio Shack kits.
    • stevekemp 33 minutes ago
      I have a paper copy of "IC 555 projects" kicking around on my bookshelf still!

      PDF version here https://worldradiohistory.com/UK/Bernards-And-Babani/Babani/...

  • nom 2 hours ago
    also today's date is 5.5. and the video is 5m55s
  • amelius 1 hour ago
    What component values do you need to time exactly 55 years?

    Maybe it could work if you used 5 timers?

    • megous 29 minutes ago
      I don't think you could do it. Not with the original BJT variant anyway. :)
  • kazinator 1 hour ago
    Time to slow it down to lower frequencies and give it more frequent checkups.
  • raverbashing 30 minutes ago
    Makes me wonder if we could have a 555 circuit with a trigger time of 55 yrs
  • aj7 1 hour ago
    The late Harold DuBose use to use the 555 as a power inverter as it could sink 200ma at the laser companies he worked for. Convenient and cheap.
  • encom 1 hour ago
    Can't watch it right now, but upvoted for Dave Jones. He's taught me so much. Absolute treasure, and the host of one of the last great active forums. Thank you for not blackholing all that info on the disaster that is Discord, like so many other communities.
  • ilvez 1 hour ago
    killer oneshot, laughed hard..
  • robofanatic 2 hours ago
    and this is the fifth comment