I need to design a DC power supply, I am connecting 3.99v battery to connect it in input but exact external power requires around 3.3v only instead of using regulator how can I send the exact amount of power supply to wireless temperature sensor if 2AA battery is not working in it, before working it directly can I test it with LAB view.
Any kind circuit suggestion to give exact 3.3 v power supply with the help zener diode or simple diode will be a great help.