This Radios schematic is a basic two-dimensional circuit representation that shows the functionality and connectivity of various electrical components. The transistors are also depicted in this Radios Schematic. The advantages of transistors, namely their small size, low supply voltage, and low power consumption, have allowed receivers to be significantly reduced in size and weight and powered by miniature batteries housed within the receiver casing. The combination of C1 and L1 forms a resonant circuit known as a tank circuit. Its purpose is to choose one of several available radio signals. The variable capacitor C1 allows tuning to different signals.