These epitaxial planar transistors are mounted in the TO-126 plastic package. The NPN types are the BD135 and BD139, and the complementary PNP types are the BD136 and BD140.
The PAM8403 is an Amplifier Board that can be powered using simple 5V input and could drive two 3W + 3W stereo speakers. It is an excellent choice for, who wants a Class-D stereo audio amplifier in a small board space.
The 2N6107, 2N-6107, 6107 is a 70V 7A PNP Silicone Power Transistor, designed for use in general purpose amplifiers and switching applications TO-220A/B Package.
The BC337 is an NPN transistor with a maximum gain of 630, commonly used in low power audio applications. It can also switch loads up to 45V and 800mA hence also used as general purpose transistor.
The TIP132TIP-132 132 is a 100V 8A 70W silicon Epitaxial-Base NPN Darlington Power Transistor in monolithic Darlington configuration, mounted in Jedec TO-220 plastic package.
The XL4005 is a 5A DC-DC Adjustable Step Down Module Power Supply Converter. This product is a 180 KHz fixed frequency PWM buck (step-down) DC/DC module with high efficiency, low ripple and excellent line and load regulation.