In this video I take an old passive IR sensor board, reverse engineer the sensor and amplifier and create a homebrew version of the amplifier.

Here's the kicad circuit
https://github.com/thaaraak/PassiveIR

Here's the arduino code
https://github.com/thaaraak/PassiveIR...

Here's the datasheet to the passive IR sensor
https://media.digikey.com/pdf/Data%20...

0:00 Intro
00:54 A look at the sensor board
03:09 The sensor and amplifier schematic
07:09 A look at the original board output on the oscilloscope
08:01 Looking at the same on the homebrew circuit