• 4 Posts
  • 107 Comments
Joined 1 year ago
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Cake day: June 19th, 2023

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  • Norodix@lemmy.worldtoAsk ElectronicsSchematic review
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    3 months ago

    I don’t think the PWM on the arduino is slow for your application. Motors are actually great for filtering. Even if the current is not filtered, mechanically it is so slow that you can go as low as 100Hz and still drive the motor acceptably well.


  • Norodix@lemmy.worldtoAsk ElectronicsSchematic review
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    3 months ago

    I also worry about the LM7818. It drops about 6V, so at 330mA it burns 2W, which seems like the maximum for the package that I quickly pulled up. If you have a very efficient buck converter that gives you at most about 1A to drive the motor. Not a lot of overhead.

    Also as I said already, you could just skip the whole thing and make everything work from the 24V using PWM. Since you want to drive it with an arduino that is not a difficult thing.






  • Norodix@lemmy.worldtoAsk ElectronicsSchematic review
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    3 months ago

    Please don’t use non perpendicular lines and draw in a clearer software if possible. Its quite hard to read.

    What is the point of the push-pull BJTs? With the optocoupler you could drive the nmos gates directly. If you need more current to drive the gates (unlikely for a small motor), I suggest you buy dedicated gate drivers. They are tested and not expensive. If you have the 18V available already, using the optocouplers directly would be a lot simpler.







  • I think the real solution is repairable gadgets. A microusb port costs pennies and if the phones were repairable at all, it would be a 5 minute solder job. The same is true for USB C as well. It might be more durable, but it can still break and it feels so stupid to replace a decive because a single cheap part broke.