Please note that the question in the post title is not intended as a challenge to the conventional wisdom, it is literally a request for explanations that can help me improve my current understanding. So this post is mostly a question about why certain things should or should not be done. For exam…

[image] anon85221860: if you have an AM radio and turn your motor on/off near it, you will hear ticks from that on the radio - and you'll likely hear a buzz when the motor is going. I think this would be the case also if the motor were powered from battery pack.* [image] anon85221860: De…

[image] grb: In the context discussed above, this effect has been evaluated and found to cause at most a 0.06-V drop. In your case (context).

[image] Grumpy_Mike: Not for nothing is the best book you can buy on electronics is called The Art of Electronics I have fond memories of Horowitz & Hill (1st edition) from my youth. Glad to see it is still being updated and in press.

@PerryBebbington Sorry it's taken so long to get back to this, but I now finally have some data to share. [image] PerryBebbington: I would be interested to see an oscilloscope trace taken between the MOSFET drain and motor connection, especially when the MOSFET switches off. [image] Perry…

Excellent! Thank you for those, I too an surprised that it's not worse than it is. I'd be happy to either place a link in my tutorial back to here or unlock my tutorial so you can add what you found to it. Let me know what you prefer.

[image] grb: the presence of various oscillatory behaviors In addition, remember there are signal reflections going back and forth contributing to ringing. But I digress . . .

[image] LarryD: there are signal reflections Aren't these travelling at nearly the speed of light? If so, back-of-envelope calculations suggest that such reflections would not contribute any oscillations at frequencies lower than 1 GHz in this circuit. That is beyond the bandwidth of the os…

[image] grb: Aren't these travelling at nearly the speed of light? Yes, as do all electronic waveforms.

Hi, Have you put a 0.1uF cap across the motor. Its usual DC motor practice. The diode suppresses the back EMF, the capacitor suppresses the ringing. Thanks.. Tom.... :smiley: :+1: :coffee: :australia:

Why not power a motor from Arduino?

Other Hardware Motors, Mechanics, Power and CNC

grb March 20, 2025, 1:45am 65

Thank you. I have now posted a comment in your flyback diode tutorial thread, which consists of a slightly expanded version of the write-up above.

Topic		Replies	Views
Pump motor causing problems with Uno Motors, Mechanics, Power and CNC	26	466	May 18, 2026
Arduino Uno R4 + L293D + 12v motor: Blew-up the breadboard - Why? Motors, Mechanics, Power and CNC	32	1049	February 25, 2024
Did I break the motor, the Uno, the servo, or none of the above? Motors, Mechanics, Power and CNC	20	1403	February 17, 2023
Feeding voltage to my first project General Guidance	113	1039	May 19, 2026
Can Arduino do this? General Guidance	66	945	February 25, 2026

Why not power a motor from Arduino?

Related topics