Hi all, new here and grateful of this wonderful group of helpful brainiacs!
To jump right into it, I have a project that involves surface mount LEDs that i would like to power via 2 cr3032 (cmos type) batteries. These have a voltage of only 3v so it looks like I am stuck wiring the LEDs in parallel, given that the batteries will be in series.
Could anyone tell me how many LEDs I could power for a reasonable amount of time (~4hrs) if i choose to use .5mA/3v LEDs? also for bonus points could you tell me what value resistors I would need to limit the current (if any)? Formulas are more than welcome, as id love to be able to understand this beyond this one application- i just havent been able to turn up a solid explanation on google...
Thank you in advance for any and all input!
cabers
To jump right into it, I have a project that involves surface mount LEDs that i would like to power via 2 cr3032 (cmos type) batteries. These have a voltage of only 3v so it looks like I am stuck wiring the LEDs in parallel, given that the batteries will be in series.
Could anyone tell me how many LEDs I could power for a reasonable amount of time (~4hrs) if i choose to use .5mA/3v LEDs? also for bonus points could you tell me what value resistors I would need to limit the current (if any)? Formulas are more than welcome, as id love to be able to understand this beyond this one application- i just havent been able to turn up a solid explanation on google...
Thank you in advance for any and all input!
cabers