The Darlington Bipolar Power Transistor is designed for general-purpose amplifier and low speed switching applications. TIP120, TIP121, TIP122 (NPN); TIP125, TIP126, TIP127 (PNP) are complementary devices.
The 2SD2196 200V 15A 65W NPN Darlington Transistors TO-3P Plastic Package. This is a Through Hole Maximum Operating Temperature: + 150C Continuous Collector Current: 15A DC Collector/Base Gain hfe Min: 1500 Height: 13.5 mm Length 15 mm.
This is a 3.3V to 12V Mini DC-DC Boost Step Up Converter Board Module 5V/ 8V/ 9V 12V Output is a DC-DC Boost step-up converter module that is used to step up the voltage.
The BC548 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin.
The 2SC3198 is a 60V 150mA 400mW NPN General Purpose Transistor TO-92 Package. This NPN Silicon Epitaxial Planar Transistor for switching and AF amplifier applications.
This is a DC-DC Step Up Red Color Boost Module with enable high-performance step-up switching current (BOOST) module. The module uses the second generation of high-frequency switching technology LM2577.