polymorph:
First, tell us what you are trying to accomplish.
ok my goal is to go from here to build a system like the walkie talkie or something small similar to the communication system used in racing when the team speak to driver and the driver speak back
i can say after i finished the book i was reading i managed to build a small speaker system, and i can say i have an idea (not very advanced but i am not much confused like when i first started) of what is going on in sound stuff