Simple PIR circuit, need review Answered
I'm working on a simple circuit. The idea is to have a portable device that lights up when I stand up at night.
I have a PIR sensor that triggers 3 LEDS.
I use a LM741 as an OpAmp
The leds are type 3528. Though these LEDs are supposed to be powered with 12v, I'll use a 9v battery.
My main concern is the battery life, tha'ts why I use 100k resistors in stand-by, to limit the current.
R3 is used to fine-tune the threshold on the inverting voltage.
3.3v when it detects motion,
?v otherwise (but yet >0)
Could anyone give me some tips or advice on how to improve my circuit?