S9015 PNP Transistor: Low Frequency, Low Noise TO-92 S9015 Equivalents and Circuit, S9015 is a well-known PNP silicon BJT transistor. This transistor is mainly designed for low gain signal amplification.
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.
The 2N7000, 2N7002, NDS7002A, 7002 is an N−channel enhancement mode field effect transistors are produced using ON semis proprietary, high cell density, DMOS technology.
The infrared decoding and encoding module which leads out the serial port of MCU to connect other devices that need infrared control, and can be used as infrared wireless data communication and data transmission