Hi
For a charger in an automated system, I'd like to have a LED when my battery goes above 4V. How can I do this as simple as possible?
I can use a reference and a opamp etc, but if I want to really minimize current and components?
Any ideas?
A zener and a LED is not the option, with less voltage the Zener will still conduct. I could use a TLC431 or something....?
WBR Sonnich