The MP1484 is a Mini DC-DC 3A Adjustable Buck module is ultra small adjustable 0.8V to 20V output DC to DC step-down Buck converter uses an MP1484EN high frequency switching regulator and integrated high voltage power MOSFET.
The ADG3304 is a bidirectional logic level translator that contains four bidirectional channels. It can be used in multi voltage digital system applications such as data transfer between a low voltage DSP/Microcontroller.
The NE555 is a square wave pulse generator module can be used to produce square wave signals for experimental development or in applications such as driving stepper motors, and as an adjustable pulse generator for microcontroller.
The BC856 3B is a transistors are designed for general purpose amplifier applications. They are housed in the SC−70/SOT−323 which is designed for low power surface mount applications.
These epitaxial planar transistors are mounted in the TO-126 plastic package. The PNP types are the BD136 and BD140, and the complementary NPN types are the BD135 and BD139.