last day of this project

  Today is the end days of this project. In this case, we begin to prepare the final test. Last week, we finish the first parts of this circuit, so this week we should do the other parts of this circuit. the professor yan suggest we should record the diagram and finish their works. In the meantime, he say our first circuit's diagram has some problem, we need to change the oscilloscope and set the correct frequency.

  this weeks the abanoub miled has joined us. Even if he can not give us many help, but we are happy to do this week's project together. However, from the suggestion of the AA, we reduce the frequency of oscilloscope. last week's waveform like a straight line. however, when we reduce the frequency, the waveform outputs like the following figure 1. when we pass through the re200b, the line will up and down a little. 

               

                         Figure 1

Then we finish the other parts of the circuit. we check the circuit again and again to ensure the components' connection. The final circuit is like figure 2.

              

                        Figure 2

Of course, we test the second parts of circuit. When we pass through the re200b, the circuit can output the waveform like figure 3.  

              

                       Figure 3

The waveform like a sine wave. when we leave with re200b, it became a straight line. In the end, we can not get the correct output from the final circuit. when we test the tired circuit, the output waveform like the figure 4.
                

                      Figure 4

It has some problems in the process, but we have no time to solve this problem. we can not get the correct waveform in the final.