Edu Coore on Instagram: "Installing a transistor on a circuit board involves identifying its type (NPN, PNP, or MOSFET) and matching its pin layout—Base, Collector, and Emitter (or Gate, Drain, Source)—with the markings on the PCB. The transistor is inserted with its flat or curved side aligned to the board outline, then the pins are soldered carefully to make solid electrical joints without overheating. After soldering, excess leads are trimmed, and the connections are checked with a multimeter

Transistor Amplifier Basics - SlideServe

High Power Transistor Amplifier Circuit Diagram

Simple Audio Amplifier Using Single Transistor