I have a little circuit consisting of an LM358 and BC547 emitter follower. It runs off 4 x AAA alkaline batteries and consumes about 50mA.
What is the simplest way, without consuming additional power, of disabling the output from the LM358 when the battery voltage drops below around 4V?
In other words, I would like to have the circuit deactivate itself before a distorted wave form is output.
Prefer all passive components.
Robert Miller