IRF740 N-Channel power MOSFET 400V 10A TO-220 at CH340 is a USB bus

CH340 is a USB bus convert chip and it can realize USB conversion to serial interface

it is perfect for space-constrained embedded projects and wearable electronics

Drain-Source Capacitance (Cd): 480 pF

Adjustable current limit via onboard potentiometer

So after using this method IR sensor need not be calibrated for different ambiance condition

IRF740 N-Channel power MOSFET 400V 10A TO-220 at CH340 is a USB busThe IRF740 is an N Channel enhancement mode silicon gate power MOSFET designed for high voltage switching applications. It is avalanche rated and features nanosecond switching speeds, making it ideal for switching regulators, motor drivers, and high power converters. Key Specifications: Type: N Channel Enhancement Mode Power MOSFET Drain Source Voltage (VDS): 400V Continuous Drain Current (ID): 10A On State Resistance (RDS(on)): 0. 55 max Power