I'm new to opamps and I could use some help amplifying a PIR sensor and output to a microcontroller.
Minimum component count without compromising performance (highly integrated solutions).
Here is a provisional circuit I drew:
It uses a instrumentation amplifier as pre-amp and a duel comparator for window detector.
I know people usually use quad general purpose opamp (1 pre-amp, 2 comparator, 1 post-amp) for this but they require loads of external components.
- Q1 is IRA-S210ST01.
- Does Ref pin need buffering ? perhaps a unity-gain amp ? but it would increase component count.
Any comment is greatly appreciated !
added ref buffer.