![level shifting - Convert 12VDC fan controller output to TTL signal of laser? - Electrical Engineering Stack Exchange level shifting - Convert 12VDC fan controller output to TTL signal of laser? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/me6k0.png)
level shifting - Convert 12VDC fan controller output to TTL signal of laser? - Electrical Engineering Stack Exchange
![Can someone explain how exactly does this TTL/PWM laser driver circuit works? Found from: https://www.instructables.com/200-DIY-Laser-Engraver : r/ElectricalEngineering Can someone explain how exactly does this TTL/PWM laser driver circuit works? Found from: https://www.instructables.com/200-DIY-Laser-Engraver : r/ElectricalEngineering](https://i.redd.it/can-someone-explain-how-exactly-does-this-ttl-pwm-laser-v0-4r1yfd7kskjb1.jpg?width=2345&format=pjpg&auto=webp&s=096983151b59e3e91d745824c150fb6a9d961dc3)
Can someone explain how exactly does this TTL/PWM laser driver circuit works? Found from: https://www.instructables.com/200-DIY-Laser-Engraver : r/ElectricalEngineering
![Can someone explain how exactly does this TTL/PWM laser driver circuit works? Found from: https://www.instructables.com/200-DIY-Laser-Engraver : r/ElectricalEngineering Can someone explain how exactly does this TTL/PWM laser driver circuit works? Found from: https://www.instructables.com/200-DIY-Laser-Engraver : r/ElectricalEngineering](https://preview.redd.it/can-someone-explain-how-exactly-does-this-ttl-pwm-laser-v0-mvy1g2hkskjb1.jpg?width=640&crop=smart&auto=webp&s=a1a11461dbcdadb309fd92b72ad642f5d275d415)