How do I protect my circuit from getting more than 3.9V from a CR123 battery=?iso-8859-1?Q?=3F_=96_electronics.stackexchange.com?=

How do I protect my circuit from getting more than 3.9V from a CR123
battery? – electronics.stackexchange.com

How do I protect my circuit from getting more than 3.9V from a CR123
battery? With minimum components and minimum consumption during normal
operation.