I have been working on a Science Fair project recently, but I have been unable to understand the reasoning behind several components in a circuit I am using. The circuit is shown here: Radio Receiver Schematic The components I am struggling with are as follows:
C10 - I do not fully understand the reasoning for placing a coupling capacitor between the antenna and the AM input to the SI4844-A10. My understanding of coupling capacitors was that they block DC current. What is this capacitor doing if RF signals are AC?
C13 and L1 - It appears to me that C13 and L1 are high pass filters. This would result in high frequency signals reaching the FM input on the Si4844-A10. What is the value of using two high pass filters? Furthermore, am I correct in my assumption that these are high pass filters?
C1 and C2 - Why use capacitors on the audio output line?
If anyone has any information that may prove valuable to my understanding of these components, please respond. Moreover, if anyone has any suggestions for improvement of my question, please leave a comment.