The 24L1025I/SN is a 128K x 8 (1024K bit) Serial Electrically Erasable PROM, capable of operation across a broad voltage range (1.8V to 5.5V). It has been developed for advanced, low-power applications such as communications or data acquisition.
This module could modulate your voice on the FM radio wave. And anyone who has a radio device could receive it. We build everything on this module, which makes it very easy to build a tiny radio station
The BC558 is a PNP transistor hence the collector and emitter will be closed (Forward biased) when the base pin is held at ground and will be opened (Reverse biased) when a signal is provided to base pin.
The MC34063A Reverse Voltage Module is a Positive To Negative Voltage Converter DC3.6-36V.The MC34063A_NV is a chip based MC34063A for providing reverse voltage, negative voltage modules.