Hand Soldered LED Oscilloscope

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  • เผยแพร่เมื่อ 22 ธ.ค. 2024

ความคิดเห็น • 52

  • @Rouverius
    @Rouverius 5 ปีที่แล้ว +23

    Those electronic notebooks from Forrest M. Mims III are still amazing.

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +3

      indeed! Really great to have one here!

    • @maarkaus48
      @maarkaus48 5 ปีที่แล้ว +4

      Totally. I bought the book ages ago, and read it for fun. I managed to have an email dialogue with Mr Mims, and thanked him for his ideas. What a nice guy.

    • @peterbthomas4227
      @peterbthomas4227 5 ปีที่แล้ว +2

      Still got my set from 1990. Still useful.

  • @Davedarko
    @Davedarko 5 ปีที่แล้ว +10

    Ask me anything :P I apologise for my mood at the end, I needed to draw a line and finish the video. If anyone has any tips on what I could try to fix the behavior, please share! I would even send some stickers and a 10mm LED for correct tips :D

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +1

      @@Chris-rg6nm Interesting, I would have thought to decrease it more, instead. There has been quite a development on LEDs, maybe older just don't glow at that point. I will certainly use a pot at those current inputs to check it out.

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +3

      @@Un_Pour_Tous thanks! Soldering 400 LEDs by hand is my new record :)

    • @maarkaus48
      @maarkaus48 5 ปีที่แล้ว +1

      I loved the video. Never noticed a negative mood. I bought the book ages ago, and that was the circuit design that jumped out at me as a must try. I am very glad you did it and posted a video because it gave me more motivation to try it. I think I might make it a sound sensitive wall art project. if someone makes a noise in the room or plays music it will react.
      Very nice video. I like seeing when others struggle with things too, as it lets me know I am not alone...lol

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +3

      @@maarkaus48 thanks Maarkaus, makes me happy to hear all that! I'll see that I get an update out, once I find out how to "fix" it! Good luck with the fart indicator :P

    • @maarkaus48
      @maarkaus48 5 ปีที่แล้ว +2

      @@Davedarko lol

  • @TheCuriosium
    @TheCuriosium 5 ปีที่แล้ว +2

    I love those Forrest Mims books! I've built a bunch of projects from them over the years but never did get to the oscilloscope, though I did dream about doing it. This upscaled version is a fun project, I hope you work out the issue with the LEDs, it would make a great follow-up video!

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +1

      thanks a bunch!

  • @deathshaker0026
    @deathshaker0026 5 ปีที่แล้ว +2

    Awesome job Just Dave! :)

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +1

      thanks! :)

  • @royelectrotechnic8711
    @royelectrotechnic8711 5 ปีที่แล้ว +1

    I like your idea and building that led X&Y oscilloscope is amazing. I am looking forward to see you final version of that project. I believe it will end a very nice working oscilloscope. I will suggest that you put different led color in the center of the display vertical and horizontal. Thank you and please tell me where I can download the schematic.

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +1

      Interesting suggestion to make that bug a feature and use different LEDs. The Matrix goes from 0V to 2.5V though, so having a line at 1.25V doesn't seem too obvious. There's no real schematics, but I can make one and get back to you. I kind of want to fix some bugs first, too.

  • @richardtrevino8216
    @richardtrevino8216 5 ปีที่แล้ว +1

    What is the name of the work book, Please.

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +1

      Hi, sorry for the late reply, it's "The Forrest Mims Engineer's Notebook"

  • @bytesabre
    @bytesabre 5 ปีที่แล้ว +4

    Needs you to play Jerobeam Fenderson’s music through it

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว

      tried it, need to offset that from ac to dc :|

  • @taantricks
    @taantricks 5 ปีที่แล้ว +1

    once again nice work with the LEDs.

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +1

      wait, am I the LED guy now? :D

  • @McTroyd
    @McTroyd 5 ปีที่แล้ว +1

    If you figure out the fix, please do post an update. Good luck!

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +1

      will do, thanks!

  • @nickd2084
    @nickd2084 5 ปีที่แล้ว +1

    You need to add a resistor across the first led output

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว

      at one point I had a 6k8 resistor on every eleventh LED :D I was very tired though. I think the first thing I should do is work on the 20 LED dev boards and then go from there again, secondly find better values for the current resistors.

  • @vhm14u2c
    @vhm14u2c 5 ปีที่แล้ว +1

    Impressive to say the least. I hope you post the mods you did to make it x/y

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +1

      will definitely be in an update section or on my channel :) thanks!

  • @kckc9245
    @kckc9245 5 ปีที่แล้ว

    Hi Guys .. How to Fix you need to change on the LM 3915 IC from BAR to DOT Mode.. Check all common ground .

  • @RichSr40
    @RichSr40 5 ปีที่แล้ว +2

    LM's are internally isolated, however when running a analog low power circuit, it is generally accepted that you keep your bus traces the same width and lengths, and keep your capacitors close and tight tolerance.

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว

      hi, not sure what this comment is related to? Do you expect wire widths on the pcbs to cause problems?

    • @RichSr40
      @RichSr40 5 ปีที่แล้ว +1

      @@Davedarko Analog noise ringing between Lms can cause artifact. filtering with capacitors can help filter this an the tracing and capacitors and tracing lengths create the high and or low pass filter

  • @Magic-Smoke
    @Magic-Smoke 5 ปีที่แล้ว +1

    You have way more patience than me Dave!

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +1

      it was relaxing at some point, just watching netflix and "chill" by soldering loads of LEDs! Gah I'm such a nerd.

  • @electronash
    @electronash 5 ปีที่แล้ว

    The Forrest M Mims notebooks got me started in electronics.
    I still recommend them to anyone else wanting to learn. They are fantastic books, and explain everything so well.
    It looks like maybe the LM chips don't like the current being driven into the output pins the opposite way.
    (and the pull-ups on the output pins of the other chips seem a bit too low value, and could be passing a fair bit of current through the open-collector drivers of those chips when there is no LED voltage drop there. The outputs only need to be logic-level to drive the inverter inputs, so I would try higher value pull-ups first, like say 2K2.)
    I guess there shouldn't be passing any current through the LEDs when the inverter outputs are low anyway, but I'm wondering if there might be some other weird effects there.
    Could maybe try some ULN2003 drivers as well...
    electronics.stackexchange.com/questions/221193/possible-to-drive-a-uln2003-driver-with-a-lm3914-bar-graph-display
    Although in theory, there should only be one column of LEDs driven at a time (based on the X input / inverters), maybe the inverters are still driving too many LEDs at once, or have some weird current paths through all of the LED junctions.

  • @hardikmonga
    @hardikmonga 5 ปีที่แล้ว +10

    Hey you have GreatScott's pen, Lol

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +8

      They are handed to us Germans at birth :D

    • @ceneblock
      @ceneblock 5 ปีที่แล้ว +1

      @@Davedarko I thought you got LAMY fountain pens at birth.
      I guess times change. :)

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +1

      @@ceneblock I do buy stabilo pens and eddings from time to time :)

    • @carlosoliveira1922
      @carlosoliveira1922 5 ปีที่แล้ว

      How about make the output at an OLED display?

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +1

      @@carlosoliveira1922 I would have to digitalise the signal with analog inputs and put that on the display - which makes it a completely different project and more software based. Totally possible though.

  • @CABohol
    @CABohol 5 ปีที่แล้ว +1

    Nice

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว

      thanks! :)

  • @turutzi
    @turutzi 5 ปีที่แล้ว +5

    Ey den Typen kenne ich von der MakerFair in Hannover XD

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +1

      waaaas niemals :P MakerFaire war schon toll, hat Spaß gemacht :)

    • @MAYERMAKES
      @MAYERMAKES 5 ปีที่แล้ว +2

      Ich auch...der ist echt überall!

  • @peterbthomas4227
    @peterbthomas4227 5 ปีที่แล้ว

    Why?

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว

      Why why? Motivation was: scale it up, use big LEDs to have something that looks nice in an IKEA shelf. Work with hardware that doesn't need MCUs and solder a bunch of LEDs to show some lissajous figurs on the matrix.

    • @peterbthomas4227
      @peterbthomas4227 5 ปีที่แล้ว +1

      @@Davedarko Fair enough. Mission accomplished.

  • @mikaelkarlsson9945
    @mikaelkarlsson9945 5 ปีที่แล้ว

    -"Element 14, the electronic design community where you can connect and collaborate with top engineers from around the world"
    Where is the top engineer in this episode? Hello??

    • @Davedarko
      @Davedarko 5 ปีที่แล้ว +7

      Hello!
      Technically it says you can find the top engineers from around the world on the "element14 Community" www.element14.com/community/welcome and this is the youtube channel. I'm not claiming to be an engineer, I'm just a maker and I always try to do something that hasn't been done (too often) before. Forrest Mims is an engineer though and his book is called "Engineer's Notebook". Do you have any feedback on the content?