Don't do what I just did! (a cautionary tale)

Yes it was a linear voltage regulator - LD33CV or LD1117AV33.
The Vin max (on the spec sheet) is 15V.

I kindly suggest to use a step-down converter instead of a linear voltage regulator :slight_smile:

Going down with a LVR from 12 to 3V means 75% of the energy in the accu is dissipated in the LVR, meaning 75% goes out in the air as heat. The efficiency is then 25%.

A step-down or buck converter has a much higher efficiency.