For the purpose of getting this prototype made, should I just shoot for a pre-made buck converter? Something like this?
Eventually, I would love to be able to make my own, but I keep falling deeper and deeper into this rabbit hole! Would something like the above work for me for this purpose?
Also, for anyone following, I found out the amperage of the motor.
I got the motor a couple days ago and I connected it to my DC Variable Power Supply & Multimeter. I found out, when the pump runs at idle, it pulls .17A. When the pump output is blocked (or under load) it runs at .21A. So, If I were to do the math, it is a 3V air pump that uses .21A max with 14.28Ohms resistance. Correct? Do I do these calculations with the maximum current? or an average in between?
Do I even need to worry about this if I were to just purchase a buck converter?