4N Motorsport on Instagram: "Sound clip from yesterday! This was a flyby in the same area. Still low boost/low timing 18psi pull at 6,000ft elevation. Posting a few more of these videos in different locations this week. Can’t wait to go back on a high timing 27psi map. Will be over twice the HP soon! #bmw #bmwm #racing #performance #f1 #n55 #135i #335i #m2 #m3 #m4 #bmwlife #bmwgram"

4N Motorsport on Instagram: "First start of the N55r26 in the M4 GT4 build. I’ve got a few more things to button up and she will be ready to test! Notice the mechanical S55 water pump is gone. I wasn’t joking. N55r26 is now in the GT4 build 😂🔥🤘 #bmw #n55 #m2 #m3 #m4 #racing #performance #135i #s55 #bmwlife"

PC817 Optocoupler pinout, working and Example with Arduino

4N35 Optocoupler: Pinout, Application and Datasheet

4435芯片引脚图及功能