I Built a Robotic Actuator.......Lets Test it!

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  • Опубліковано 13 січ 2025

КОМЕНТАРІ • 349

  • @BernardSandler
    @BernardSandler Рік тому +65

    Amazing, clear description of brushless motors and how to control them. Such solid video. I look forward to seeing your creations step forward.

  • @declancraig6810
    @declancraig6810 Рік тому +10

    I'm a young student moving on to post secondary study soon and I am grateful that you were able to share this video! I am working on some of my own robotic projects and I have always had a hard time finding ways to control brushless motors and so I have stuck to brushed to simplify things for myself. After watching this you have taught me enough to inspire me to go back and learn more about his brushless motor control! I appreciate this and you definitely got a sub from me!

  • @scienceraven1200
    @scienceraven1200 Рік тому +14

    Lithium grease is for high temperatures, it can soften pla and dissolve plastics over time, i figure silicone grease is cool for pla. awesome info i hadn't seen that thanks.

  • @qcnck2776
    @qcnck2776 Рік тому +60

    A robot dog that can pick up after your dog does its duty on the sidewalk... genius🤣

    • @aaedmusa
      @aaedmusa  Рік тому +11

      You need a Nobel prize for this 🤣

    • @1islam1
      @1islam1 Рік тому +1

      @@aaedmusa ⚠️ God has said in the Quran:
      🔵 { O mankind, worship your Lord, who created you and those before you, that you may become righteous - ( 2:21 )
      🔴 [He] who made for you the earth a bed [spread out] and the sky a ceiling and sent down from the sky, rain and brought forth thereby fruits as provision for you. So do not attribute to Allah equals while you know [that there is nothing similar to Him]. ( 2:22 )
      🔵 And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof and call upon your witnesses other than Allah, if you should be truthful. ( 2:23 )
      🔴 But if you do not - and you will never be able to - then fear the Fire, whose fuel is men and stones, prepared for the disbelievers.( 2:24 )
      🔵 And give good tidings to those who believe and do righteous deeds that they will have gardens [in Paradise] beneath which rivers flow. Whenever they are provided with a provision of fruit therefrom, they will say, "This is what we were provided with before." And it is given to them in likeness. And they will have therein purified spouses, and they will abide therein eternally. ( 2:25 )
      ⚠️ Quran

    • @birdie8085
      @birdie8085 Рік тому

      ​@@1islam1stop shitting with God shit dude.

    • @1987garrettwright
      @1987garrettwright Рік тому

      ​@@1islam1shut up

    • @Hukkinen
      @Hukkinen Рік тому +1

      @@aaedmusa Hook it up with ROS or ROS2 so I believe others can contribute or there are functionalities already implemented 😊

  • @SmirkInvestigator
    @SmirkInvestigator Рік тому +4

    This is all the research and explanation a non-electronics person like me needed to hear. Subscribed.

  • @murdercom998
    @murdercom998 Рік тому +5

    When I got halfway through and I'm like this guy deserves a sub, I'm shocked by how few subs for the quality. Great job

  • @DavePetrillo
    @DavePetrillo Рік тому +9

    Awesome design, impressive performance!

  • @JonHylands
    @JonHylands Рік тому +3

    This is a really well done project, and an amazingly well done video. You are a natural at presenting your material with a touch of humor and a ton of knowledge - well done indeed!

  • @thepenfeed.6753
    @thepenfeed.6753 Рік тому +1

    the whole video was fantastic but the flute in the intro was pure gold!

  • @kristian3805
    @kristian3805 Рік тому +2

    Aaed, greetings from Norway!
    I need to apoligise to you for not having found you sooner. Absolutely awesome channel!

  • @ShinjiCarlos
    @ShinjiCarlos Рік тому +1

    I loved everything in this project, my friend! Even the sarcasm in between!

  • @hadlock
    @hadlock Рік тому +2

    Really impressive. Video is super clear. Looking at the rest of the project looks like a really solid design that can be adapted to other projects. Thanks for sharing. You already have me pricing out those motors online

  • @a97civic20
    @a97civic20 Рік тому

    3:46 I see you got some good music taste there😉Awesome video man you got a well earned sub

  • @AstroSamDev
    @AstroSamDev Рік тому +1

    Very cool, I'll have to try building one of these myself!
    Can't wait to see a robot using these in the future.

  • @haydenc2742
    @haydenc2742 Рік тому +1

    Get Danco silicon grease rather than white lithium grease...it is thicker, and won't attract dust
    Pretty darn cool though!
    Keep em coming!!!!

  • @tanlaan
    @tanlaan Рік тому +2

    Extremely impressive! Can't wait to see this come together!

  • @itsjjbones
    @itsjjbones Рік тому +14

    Wow, that's pretty neat! If you make a video on a walking robot, I can't wait to see it. Your website is pretty dope to get more info and the design from. Top notch creater that deserves more attention. I've heard of those brushless drone motor catching fire becasue usually they are meant to have air blowing constantly through it, but it can be managed hopefully. Cheers!

    • @aaedmusa
      @aaedmusa  Рік тому +4

      Thanks! Hopefully, that won't be an issue with the current and velocity limits but putting a small fan on the inside could be a potential upgrade in a future iteration.

    • @andycrask3531
      @andycrask3531 Рік тому

      James Bruton on here has made many walking robots check him out

    • @FasutonemuMyoji
      @FasutonemuMyoji Рік тому

      @@aaedmusa With those vents I can see using a small temperature sensor and one of those super small aliexpress 12v pc fans to actively cool it if it starts to overheat.
      Also, production value is 🤌keep it up!

    • @itsjjbones
      @itsjjbones Рік тому +1

      @andycrask3531 Yes, it's a great channel. I've been subbed to him for a few years. I like this actuator better than the cycloidal drive actuator that James Bruton build for his walking dog because it's much smaller with the motor assembly and everything as well as having fewer barrings which can jack up the cost a lot very quickly.

    • @aaedmusa
      @aaedmusa  Рік тому +1

      @@andycrask3531 I love his videos. I took a lot of inspiration from his cycloidal actuator design in opendog v3.

  • @OhHeyTrevorFlowers
    @OhHeyTrevorFlowers Рік тому +6

    Damn solid work! Thank you for sharing, both this video and the source. 💪

  • @tomasjackson6748
    @tomasjackson6748 Рік тому +3

    It appears that the algorithm is blessing us all with your fabulous content! I’m very excited to see the continuation of this project. It is beautiful work, and presented wonderfully. Subbed immediately.

  • @nickandersonco
    @nickandersonco Рік тому +1

    Dude you're really killing it both from a design and engineering perspective, as well as from a content perspective. I'm loving these videos🤜

  • @ad9218
    @ad9218 Рік тому

    Glad that the algorithm showed me your channel, very nice and quality videos, looking forward to the next one!

  • @austinsand8163
    @austinsand8163 Рік тому +1

    Wow, excellent project and awesome video! Great editing and videography, impressively artful editing, and well thought out explanation of enough of the basics to explain your design decisions. Love it, excited to see what you build with it, and if I can finish some of my current projects I'm going to build one!

    • @aaedmusa
      @aaedmusa  Рік тому +1

      Thanks! Definitely planning on a couple robots with this one. Totally check out the website if you plan on building one.

  • @MichelleStanley-y4g
    @MichelleStanley-y4g Рік тому

    Super cool project! Great presentation as well, keep at it!. Extremely impressive! Can't wait to see this come together!.

  • @damianwiecaw492
    @damianwiecaw492 Рік тому +1

    Pretty production, keep going man, i know how much work you have put into it.

  • @MartinAlix
    @MartinAlix Рік тому

    Best video I’ve found so far on such motors!
    Thank you 🎉

  • @filmweaver2013
    @filmweaver2013 Рік тому +1

    Awesome! I just finished making a cycloidal drive actuator! I am using nema 17, but i love the idea of using BLDC, with my terribly inefficient nema 17s,

    • @aaedmusa
      @aaedmusa  Рік тому +1

      Thanks! BLDC motors are great, but I feel like you should be able to get a lot more torque than that with a Nema 17.

    • @filmweaver2013
      @filmweaver2013 Рік тому

      @@aaedmusa yes, I am a little noob on the electronics, just getting comfortable so, i was not gonna get into position control and all 😅
      But yes, I will get into BLDCs

  • @scellyyt
    @scellyyt Рік тому +1

    was fully expecting this channel to have like 100k subscribers when i looked at the channel, this is a very well made video and a very good actuator design.

  • @GoAwayStupidAI
    @GoAwayStupidAI Рік тому +1

    "a few more test prints" 😂 yeah. I feel this

  • @jordankivitz
    @jordankivitz Рік тому

    Thanks! Also, having the clamps on one side made my eye twitch. Those tests aren't providing enough data about the motor without a stationary point. Make your base wider, Flip the clamps 90 and add a few milimeters between, then reposition the camera. Anyways, I'll be using this within my engineering courses this fall. Thanks again for all you do! Would you be interested in meeting virtually with my students, this fall?

  • @Peanutz77
    @Peanutz77 Рік тому +3

    good stuff.. i feel like this could be used for a diy sim force feedback wheel..

    • @Noah-js5mc
      @Noah-js5mc Рік тому +1

      I was thinking the exact same thing, 16 nm would be plenty enough!

    • @poplix2704
      @poplix2704 Рік тому +1

      very good thinking, shouldnt be too expensive either

  • @geri777
    @geri777 Рік тому

    Thank you for having a native English speaker. It's a pleasure to listen to your videos.

  • @chipcode5538
    @chipcode5538 Рік тому +1

    Nice work, the design looks nice.

  • @hughatkins
    @hughatkins Рік тому +1

    Awesome video and explanation. I’m going to your website and looking at more!

  • @ericmurray1679
    @ericmurray1679 8 місяців тому

    This is really cool, Looking forward to seeing it walk!

  • @ErikPelyukhno
    @ErikPelyukhno Рік тому +1

    This was a fun watch! I learned things, saw some really cool tech and now I feel inspired to work on some projects I’ve been procrastinating on.

  • @shaderblue2555
    @shaderblue2555 Рік тому

    3:47 music taste is immaculate

  • @rithikcorrupt3848
    @rithikcorrupt3848 Рік тому

    I'll be joining the boilermaker crew as an engineering student in the fall! This is crazy awesome, cant wait to see it being implemented in some robot designs. I hope one day my videos can be as impressive and entertaining as yours!

  • @kingminilogo
    @kingminilogo Рік тому +7

    if you continue like this, i see no reason why you shouldnt succeed, really entertaining video! Nice explanations :) Keep on going, good work. Greetings from Luxembourg

  • @unpopular_mechanics
    @unpopular_mechanics Рік тому +1

    Very cool. I have found that inexpensive force gauges from amazon are pretty good and useful for measuring things like this, they come with different attachments and mounting options, some of them have serial ports for data logging.

  • @Paul-qu4kl
    @Paul-qu4kl Рік тому

    Awesome video, great project, and I especially enjoyed the great editing with all the music and sound effects! Instant sub and waiting for more (after I've watched all of your previous videos).

  • @PhG1961
    @PhG1961 Рік тому

    A really awesome and amazing video! Great ingenuity and craftmansship. I've seen many, MANY videos on harmonic drives and planetary gearboxes, this is really an outstanding video. Of course I hit the like button and immediately subscribed.

  • @goodbasic6486
    @goodbasic6486 Рік тому

    Epic. Thank you for sharing the how to and open source license

  • @luqmanulhakim9287
    @luqmanulhakim9287 Рік тому +1

    Very detail explanation. Hope for more contents like this❤

  • @klausnielsen1537
    @klausnielsen1537 Рік тому +2

    So well presented, explained and executed. With humour too. In a tech channel. I subbed...😊

  • @MariusHeier1
    @MariusHeier1 Рік тому +1

    Love the sound design as well! ❤

  • @MakerGrigio
    @MakerGrigio Рік тому

    THANK you so much for making this, I've had a project on hold waiting for just something like this! I want to make a gang of these to pull and feed out cables in a cable operated robotic mechanism. Excellent work! I'd love to see you make a bipedal robot, use the technique of simulating the actuators in a game engine like unity, and train the control AI in a game engine on a desktop PC. (That is the part I'm focusing on, how to simulate cable mechanisms in a game engine, and use that to train a control AI)

  • @chadrobke9676
    @chadrobke9676 Рік тому

    Using it as a clutch mechanizm/drive unit for a tracked vehicle would be sick!

  • @adamkmcneish
    @adamkmcneish Рік тому +1

    Great video. Try printing on a PEI sheet, the parts release so nicely.

  • @jimviau327
    @jimviau327 Рік тому

    Great performance for sure. It appear to me that a more versatile walking robot should be built with 4 motorized wheels as feet. This way the robot becomes much more efficient as it can walk and or roll.

  • @harshbiscuitwala3018
    @harshbiscuitwala3018 Рік тому

    Loved the video the fundamentals you covered really gave a lot of information about motors thanks a lot

  • @dmitrymaslov4458
    @dmitrymaslov4458 Рік тому

    Great engineering and video presentation. I enjoyed every one of your videos. Keep it coming!

  • @Klatrevalross
    @Klatrevalross Рік тому +1

    The torque is proportional to the area of the stator, not diameter. The flat ones are proffered due to the surface area which provides cooling.

  • @onward189
    @onward189 Рік тому

    I just found this channel while scrolling my recommended section, and I wish I found this channel sooner. I love this type of content.

  • @CarmineNoviello
    @CarmineNoviello 6 місяців тому

    You are a source of great inspiration for everyone. Thank you for sharing so much information!

  • @AirKiter
    @AirKiter Рік тому

    Helpfully this becomes the beginning of an opensource full robot

  • @effectentertainment7882
    @effectentertainment7882 Рік тому

    Man what a great video. Also thanks for sharing your work.

  • @MichielR
    @MichielR Рік тому

    Super cool project! Great presentation as well, keep at it!

  • @Luke-qf3ue
    @Luke-qf3ue Рік тому +2

    I think your subscriber count is going to increase rapidly. Great content

  • @NavyCuda
    @NavyCuda Рік тому +1

    I've been using a premium lithium complex grease with moly in my pla gearsets, I would be interested in your thoughts on pla lubrication in general.

    • @aaedmusa
      @aaedmusa  Рік тому

      I've only ever used white lithium grease. It works well for me and I've read that it's pretty good for PLA. I've also seen people use silicon grease for PLA.

  • @NexGen-3D
    @NexGen-3D Рік тому +1

    Awesome job dude, just think how nice this will be if It was printed from a high quality UPAHT-CF15 or a PA11-CF instead of PLA, even ABS-CF would be a nice choice.

  • @MattOGormanSmith
    @MattOGormanSmith Рік тому +1

    Please don't hammer bearings into place. If you must, at least find a short piece of metal tube the same size as the outer race and tappy-tap on that. Squeezing them in a vice would be better (with the ring to ensure all pressure is on the outer race) if you don't have any other kind of press. If you can't find or make an appropriate tube, maybe you could print something.

  • @kiaranr
    @kiaranr 10 місяців тому

    Dude, this is SO cool. That's all.

  • @goremaker244
    @goremaker244 Рік тому

    Wow, your skill, knowledge and presentation exceeds your subscriber count. I look forward to see what else you do

  • @SimpleElectronics
    @SimpleElectronics Рік тому

    What an underrated channel - great work!

  • @retired_man_about_town
    @retired_man_about_town Рік тому +1

    love this! Thank you

  • @adamsalem-s
    @adamsalem-s Рік тому +2

    I noticed one thing wrong with your 3D printer you may want to consider fixing. Your bed looks loose from the clip at 2:03 underneath the bed there should be eccentric nuts, tighten them until it doesn't wobble. Look up a video on how to tighten it for further instructions.

  • @med167
    @med167 Рік тому

    good job, can't wait to see the walking robot.

  • @randombricksanimations6049
    @randombricksanimations6049 8 місяців тому

    Dude. This is such an inspiration to me. I'm in my third year of mechanical engineering and I'm planning on going to grad school after I graduate to further study robotics. I have been teaching myself arduino and super basic robotics stuff in between classes in my free time but I have such a long way to go. It is so motivating and inspiring seeing what this field can do when you put the time into it. I would love to know what your education path was like. Did you attend a 4 year university? Graduate school? Self taught? Is this a side hobby or a full time career you have?
    Thank you!

  • @scooterboom4157
    @scooterboom4157 Рік тому

    please bro make a tutorial about torque in brushless motors! youre so good at it!

  • @BerzerkaDurk
    @BerzerkaDurk Рік тому

    Earned my sub. Can't wait to watch your channel grow. Keep up the good work.

  • @bff2109
    @bff2109 Рік тому

    It’s cool to be be in the under 10k sub club. I know this guy is going to a million

  • @chibuezendiokwelu63
    @chibuezendiokwelu63 Рік тому

    At 3:01 and 5:32 how were u able to achieve that spring like reaction with the motor

  • @yoashuain1
    @yoashuain1 Рік тому

    Using a planetary gear system to run a planetary gear system is really funny. 😂😂😂😂😂 The Drill!😂😂😂😂😂

  • @smartsensingandroboticslab789
    @smartsensingandroboticslab789 7 місяців тому

    Please help to answer a few questions for the video:
    1: What is the first step in creating an electric actuator for a walking robot?
    A. Designing the gear drive
    B. Researching the best actuator designs
    C. Building the motor controller
    D. Testing the actuator compliance
    2: What type of motor is recommended for an electric actuator in a walking robot?
    A. Standard DC motor
    B. Brushless motor
    C. Servo motor
    D. Stepper motor
    3:What is the purpose of using a gear drive in an electric actuator?
    A. To increase speed
    B. To reduce efficiency
    C. To increase torque
    D. To decrease compliance
    4: What type of gear set was used in the actuator design mentioned in the text?
    A. Spur gear set
    B. Bevel gear set
    C. Planetary gear set
    D. Rack and pinion gear set
    5: What is the benefit of using helical gears in an actuator design?
    A. Low load capacity
    B. High noise level
    C. Ideal for high load applications
    D. Inefficient power transmission
    6: What type of controller was used to control the brushless motor in the actuator?
    A. PID controller
    B. FOC controller
    C. ESC controller
    D. PLC controller
    7: What does FOC stand for in the context of motor control?
    A. Field Oriented Control
    B. Frequency Oscillation Control
    C. Force Output Control
    D. Feedback Override Control
    8: What is the compliance feature of the actuator used for?
    A. Increasing speed
    B. Absorbing shock
    C. Reducing torque
    D. Improving efficiency
    9: What was the peak holding torque of the actuator when tested with 10 pounds?
    A. 10 newton meters
    B. 14.5 newton meters
    C. 16.36 newton meters
    D. 20 newton meters
    10: What is one advantage of the actuator design mentioned in the text?
    A. Heavyweight
    B. Requires frequent maintenance
    C. Open source design
    D. Inefficient cooling system

  • @charlescoult
    @charlescoult Рік тому +1

    Very well done.

  • @conorstewart2214
    @conorstewart2214 Рік тому +1

    Great video. I would suggest you use a vice for press fitting things rather than a hammer, a vice let’s things go in straighter without any impacts. I would also suggest using nylon for the gears if you are able to print it.
    Edit: you should also stop mixing units, you measured the arm length in inches and then calculated torque in Nm. NASA made a mistake once due to mixing units and ended up destroying a probe.

    • @aaedmusa
      @aaedmusa  Рік тому

      Yep, unfortunately, I don't own a vice. I have never tried nylon but that's definitely something to look into.

  • @johnathonwalty8915
    @johnathonwalty8915 2 місяці тому

    Nice design. 👍

  • @szymonjastrzebski2909
    @szymonjastrzebski2909 Рік тому

    Great design!
    One think I don't like is use of helical teeth profile as these create an axial force while in use and in current design it can increase wear and lower the efficiency. Would it be possible to use herringbone gears in your design? Either solid or 2 part ones

  • @dodman0907153500
    @dodman0907153500 Рік тому

    beating directly on the bearing with hammer should be punishable by death, but other than that, perfect video...

  • @bouipozz
    @bouipozz Рік тому +1

    Great video, love to see more like this

  • @bradfooks798
    @bradfooks798 Рік тому

    Nice video mate. Pls make an RC walking trebuchet

    • @aaedmusa
      @aaedmusa  Рік тому

      Interesting idea. noted.

  • @triplebig
    @triplebig Рік тому

    Your channel is amazing. You will be huge!!!

  • @SkiingInstructorWithAPasssion
    @SkiingInstructorWithAPasssion 11 місяців тому

    This is an awesome project - my dream would be a colab with you and James Bruton(opendog)

  • @RoccosStuff
    @RoccosStuff Рік тому

    Wow, awesome project and great video! You did a great job explaining everything. Looking forward to the next video!

  • @pekhotinyets
    @pekhotinyets Рік тому

    I see you have the glass bed with clips. I find if you remove the bed, then pull off the print, it doesn't mess up the leveling from print to print.

  • @oidkqw
    @oidkqw Рік тому

    Maybe you could try building a high precision actuator with a rotary encoder, and then measure the backlash.

  • @MiniMasterpiece1
    @MiniMasterpiece1 Рік тому +2

    Bro I really love our Vid ❤ And that it is open source

  • @luizbueno5661
    @luizbueno5661 Рік тому

    This is so wonderful! Thank you for this

  • @davidmalawey
    @davidmalawey Рік тому

    Your Detailed explanations are great.
    How much power does it take to hold 5 lbs on the lever?
    Nobody talks about this and we need to know!

  • @iandiyweekend3771
    @iandiyweekend3771 Рік тому

    I might use this idea for my sim racing Force feedback steering

  • @Theminecraftian772
    @Theminecraftian772 Рік тому

    I think it would be really neat to have a pentapod style walking robot. Not practical by any means, but it would be cool.

  • @timothy5403
    @timothy5403 Рік тому

    Awesome video little advice herringbone gears may be a better idea than helical to keep from exerting a perpendicular force on the gears. Please educate me if I’m wrong!

    • @aaedmusa
      @aaedmusa  Рік тому +1

      That's true, but it's impossible to use herringbone gears with a planetary gear drive because you cannot push the planet gears in due to the two different profiles.

    • @timothy5403
      @timothy5403 Рік тому +1

      Also, sorry commenting as I watch. (I love the content don’t take any of this as criticism i could be wrong) when you are fitting your gears into 3D printed parts it may seriously impact your gear efficiency to hammer with uneven pressure. Ideally you would press fit them in with a flat headed vice. In my experience this should extend the lifespan of your parts as well as improve efficiency.

    • @timothy5403
      @timothy5403 Рік тому +1

      @@aaedmusaahhh I see!

    • @timothy5403
      @timothy5403 Рік тому +1

      Also that controller that you used instead of an esc is so cool, I had no idea brushless motors could be controlled like that. Really blew my mind

  • @EridaniOpsCG
    @EridaniOpsCG 5 місяців тому

    Thank you so much. This is going to help me a lot with my project.

  • @javipk7
    @javipk7 Рік тому

    awesome! thanks for making it open source!!

  • @TheAdventureLog
    @TheAdventureLog Рік тому +1

    Hey, I'm almost done printing all the parts and I ordered everything I need. I was wondering, is there any particular reason you didn't use a BLDC motor from ODRIVE?

    • @aaedmusa
      @aaedmusa  Рік тому +1

      Too expensive and low torque densities.

    • @TheAdventureLog
      @TheAdventureLog Рік тому

      @@aaedmusa thanks for the quick reply. I figured. Have you done any torture tests to see how well the PLA holds up? I printed mine in PETG.

    • @aaedmusa
      @aaedmusa  Рік тому +1

      @@TheAdventureLog No I haven’t done stress tests yet. I also haven’t printed around with PETG but I’m pretty sure it should be stronger than PLA. You can always print at 100% infill if you are worried about failure.

  • @toast1797
    @toast1797 Рік тому +2

    Awesome content man! Looking forward to your next iteration of robot quadruped using this drive! Side question, would you continue making content for your channel after graduating?

  • @creativusme
    @creativusme Рік тому

    this is awesome man! but this bed adehision is incredible. I just wanted to give you an advice about that, if you just hit the bed where it is, you are gonna destroy your bed level and also in the long run you can ruin the printer itself. with my cr-10 when it is really stuck there i remove the bed and i place it on a desk to scrape or bang it off. if you want to just pop the things of the printer it is really nice to have a glass or mirror bed with some hair spray on it or you can just higher up the Z-offset. i hope you find that helpful ;)

  • @vikaspoddar001
    @vikaspoddar001 Рік тому

    Hey Brother, This is great.🎉🎉🎉 For peoject, you should come up with a extensible quadruped robot, With ability to run with help of ROS

  • @egehosgungor2897
    @egehosgungor2897 Рік тому +1

    inspiring, thanks for sharing this with us

  • @abdullahsabir6529
    @abdullahsabir6529 Рік тому

    I want to learn this subject (3d modeling, designing, and electrical circuit board builting) what is the name of this field or subject Or from where i can start learning properly