Hi, I need help with a simple Arduino circuit. If i powered for example with 15 V and 3 A battery, could i burn the board? Obviously in addition to Arduino other elements would be connected, for example dc motors so that the total voltage is 15 V. In particular I wanted to know if the execess of amps could be a problem. Thanks in advance.
"excess in amps" will not be a problem, the Arduino will only draw the current it needs. It will burn up the 5V regulator with a 15V supply however.
Get yourself a little step down regulator to make 5V from the 15V supply.
The motors powered from 15V will need some external control to turn them on and off, and the current from the 15V supply will NOT go thru the Arduino board. Could be a simple transistor if they only need on/off and spin in just one direction. Better guidance can be offered if you provide more information on the motors and what you want them to do.
Thank you. However with regard to the motors, they must not change the direction of rotation, I am only interested in adjusting their speed
You can use an N-channel MOSFET like this one
https://www.digikey.com/en/products/detail/diodes-incorporated/DMT6009LCT/6051857
It has a low on-Resistance (Rds) of just 0.0145 ohm with a gate voltage (Vge) of 4.5V, perfect for driving from a 5V powered Arduino with 3A of load current.
Power dissipated in the device will be low too: P = I^2 x R = 3A x 3A x 0.0145 ohm = 0.13W (130mW) so minimal heatsinking will be needed.
Thank you very much.
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