Hi,
I'm doing a small project, and could use techy some input.
I'm putting 3 - 9volt batteries together in series to get 27 volts.
I'd like to know when the battery power is getting low.
So I want to use an LED light. I want it to come on with the project switch if the batteries have at least 12v of power or up to 18 v would be ok too. But if it is less than that, I want the LED to stay off so I know to change the batteries.
Could someone help me select parts? Radio shack it the easiest local source.
Thanks!
I'm doing a small project, and could use techy some input.
I'm putting 3 - 9volt batteries together in series to get 27 volts.
I'd like to know when the battery power is getting low.
So I want to use an LED light. I want it to come on with the project switch if the batteries have at least 12v of power or up to 18 v would be ok too. But if it is less than that, I want the LED to stay off so I know to change the batteries.
Could someone help me select parts? Radio shack it the easiest local source.
Thanks!