BD135 45V 1.5A NPN Power Transistor

10৳ 
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.

LM2587 DC-DC Step Up or Boost Module

450৳ 
The LM2587 is an Input Voltage Range 3.5-30V to Adjustable Output Voltage Range 4.0-30V 80W DC-DC Booster Converter Step Up Voltage Regulator Module.

LTC3780 DC-DC Buck Boost Module 10A (130W)

1850৳ 
The LTC3780 is a DC-DC-Auto-Up & Down-Voltage-Regulator-5-32V-to-1-24V-DC-Adjustable-Converter. My interest in this DC-DC switcher is to operate 19VDC laptops/notebooks and LCD TVs from 12V batteries/solar.

2SC9014 60V 150mA NPN Small Signal Transistor

4৳ 
The 2SC9014 2SC-9014 2SC 9014 C9014 is a NPN 50V 0.1A 0.6W 270MHz Transistor TO-92 Package Bipolar NPN Small Signal Transistor Electrical Circuitry and Parts

MPSA42 300V 500mA NPN Switching Transistor

4৳ 
The MPSA42, A42, 42 is a 300V 500mA NPN Switching Transistors. PNP high-voltage transistor in a TO-92; SOT54 plastic package. NPN complement: MPSA92.