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.
It is a small built-in vibration motor Module. After input 5V current, you can control the ON / OFF or vibration intensity of the motor By digital signal or PWM signal.
The 2N5400 and 2N5401 are silicon PNP transistors designed for high voltage amplifier applications. Bipolar (BJT) Transistor PNP 150V 600mA 300MHz 350mW Surface Mount SOT-23.