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

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  • 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.






  • 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.