The DMG2302U-7 is 20V 4.2A 800 mW SOT23 Package. This N channel MOSFET transistor operates in enhancement mode. This MOSFET transistor has an operating temperature range of -55 °C to 150 °C.
This is Boost Module With Digital Display which is a high-performance step-up switching current module. The XL6009 DC-DC 4.5-32V to 5V-35V XL6009 Boost Step-up Module Adjustable Digital Voltmeter.
The 2SK3515, 2SK-3515, K3515, 3515 is a 450V, 10A, 48W TO-220NIS Package MOSFET, The FUJI Electric manufacturer is a IC Chips with N CHANNEL SILICON POWER MOSFET for more details of 2SK3515 can be seen below.
The 2SK2850, 2SK-2850, K2850, 2850 Is a 6A 900V 125W N-Channel MOSFET Or Field Effect Transistor TO-3P Package 3 Pin Leads, Product Manufactured by Company Fuji Electric Corp.
The 2N3906 Is 40V 200mA 625mW PNP Bipolar Transistor is designed for use in linear and switching applications. The device is housed in the TO-92 package, which is designed for medium power applications