I am hacking an old RC Car handset, basically just taking out the old circuit board and replacing it with one powered by a nano.
The handset was powered with 8 AA batteries, so around 12V (I am getting 12.7V with brand new batteries) and wanted to ask what the best way was of using that power.
So the Nano needs 5V and I am also using a NRF24 which needs 3.3V. I have plenty of space to include additional voltage regulators.
So I believe I have a couple of options but I dont know what would be thought of as best practise.
Option 1. Connect the batteries directlly to VIN on the nano and let the internal regulator handle the 5V and also connect the 3.3V regulator to teh batteries. My concerns here would be both the regualtors overheating due to having to deal with the large dissipation.
Option 2. Have a seperate 5V regulator just to power the nano. Still have the 3.3V regulator connected directlly to teh batteries.
Option 3. Have the seperate 5V regulator use that to power the nano as well as powering the 3.3V regulator.
Option 4. Something else entirely that you would suggest.
So how would you do it?