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Ask an Expert Forum Muscle to micro servo circuit
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Muscle to micro servo circuit

Doppleganger
Doppleganger over 2 years ago

Morning all

So i started a Udemy class on Electronics and Robotics a while ago, and frankly I'm struggling. Apparently I'm great at building circuits from a photo or a video, but I have a lot of issues with schematics. Not super relevant to the post, but it may be helpful to you all to know where I'm coming from. I hope this isn't offside, but if some fine peeps could take a look at what I've built, see if I missed anything, or miss placed anything, that would be super helpful. Normally id just harass the instructor, but the class is 7 years old, and he is busy with other projects now and doesn't get back to me very often. 

So, red, orange and yellow wires on the left go to the micro servo. Blue, green and yellow at bottom right go to the muscle sensors. Top positive and bottom negative are 6v, and the neg is also my ground (unsure about that, prof kinda skimmed that detail). Top negative is positive 9v, and bottom positive is neg 9v. Did that just to keep things straight in my head. I didn't have a 1000 cap, hence the stack of 3 in the middle of the board. 

Main concern i have, that it dosnt work. Beyond that, from going through the class forum from many years ago, other students had a sh*t load of wires coming off the amp. I get that we all build differently, but just have 2, not 30. Maybe more weird than concerning.

Again, any insights are helpful.

imageimageimageimage

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  • shabaz
    shabaz over 2 years ago +5
    Hi, You don't seem to have wired up pins 4 and 11 of the TL074 chip.
  • rad_bcit
    rad_bcit over 2 years ago +4
    Hello, I teach breadboarding skills and my immediate reaction to your photos is to say that the easiest remedy to your wiring issues is to tidy up the way you do your breadboarding. I would ask you to…
  • michaelkellett
    michaelkellett over 2 years ago in reply to Doppleganger +4
    I looked through the replies you got and didn't find any at all with the phrases you quoted. It seemed quite a good response to me, you got a lot of good and relevant answers and the usual E14 diversions…
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  • shabaz
    shabaz over 2 years ago

    Hi,

    You don't seem to have wired up pins 4 and 11 of the TL074 chip.

    image

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  • Doppleganger
    Doppleganger over 2 years ago in reply to shabaz

    Thanks Shabaz, i dont see pins 4 or 11 on the schematic though. The pinout says 4 is Vcc and 11 is Vee, i vaguely remember the prof saying thats for voltage in and out, by my old man brain may be mis-remembering. And even that wouldnt make much sense as 6v and 9v are already conected at various points.  Priciate the reply.

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  • genebren
    genebren over 2 years ago in reply to Doppleganger

    Pins 4 and 11 are in fact on the schematic.  They are the power pins to the Op-amps, shown connected to 9V and -9V.

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  • genebren
    genebren over 2 years ago in reply to genebren

    image

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  • shabaz
    shabaz over 2 years ago in reply to genebren

    Exactly as Gene says:

    image

    The chip needs a power source, and the TL074 datasheet can also be examined, it too will indicate this.

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  • shabaz
    shabaz over 2 years ago in reply to genebren

    Sorry our replies crossed! : )

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  • genebren
    genebren over 2 years ago in reply to shabaz

    No problem, I was just backing up what you found anyway.

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  • Doppleganger
    Doppleganger over 2 years ago in reply to genebren

    Ballz. Thanks guys, i didnt even see that, i only saw the pin references on the outside of the "triangle". So then 6v runs the 555 timer chips and 9v for the 74 chip?

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  • shabaz
    shabaz over 2 years ago in reply to Doppleganger

    The 6V is being used to power the servos and the 555. 

    The +9V and -9V supplies are being used for the TL074 quad op-amp.

    image (Image source: TL074 datasheet)

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  • shabaz
    shabaz over 2 years ago in reply to Doppleganger

    The 6V is being used to power the servos and the 555. 

    The +9V and -9V supplies are being used for the TL074 quad op-amp.

    image (Image source: TL074 datasheet)

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