Hello again Electronoobs. I am currently stuck on another matter. The received signal from the receiver speaker is not being amplified properly. In fact, the receiver isn't even responding when I assembled the amplifier part of the circuit. Which is odd because I tested the speaker first and it responded properly albeit with small voltage. I've been adjusting my potentiometers for days and my speak is not responding properly on my oscilloscope. Could it be because I wired my oscilloscope on the wrong output? Also I noticed you didn't set up the comparator part of the LM324, may I ask why?