**The third challenge is about the finding proper components. The components which we could not find at the market were MC33172P op-amp and 2N3819 JFET. We investigated equivalent of these components via internet and we find UA741 instead of MC33172P and BF245C instead of 2N3819.


**The other difficulty is that before we implement this AM Receiver Circuit, we implemented three different circuit on the board and we did not accomplish to perform the circuits. We then find this AM Receiver Circuit Schematic for about two months later and implemented it.
**The final problem was the effect of the noise. Since we are building AM receiver and the effect of the noise for Amplitude Modulation is much higher than Frequency Modulation, our circuit was affected considerable. We tried to minimize this effect by using Printed Circuit Board instead of a regular board.