2019 telecast retest test questions

 

 

 

For this 2019 The subject of , It's just suitable for practicing before the video game , It is required to retest within five hours , Three people together , Time is still tight , Need strong psychological quality and ability . So here is my idea .

 

 

principle ： The square wave is generated by the oscillating circuit , Change the frequency of the waveform through adjustable resistance
Calculation formula ：1/2*pi*R*C

 

principle ： The square wave integral produces a triangular wave , Then use the analog comparator to compare the triangular wave with a DC level and output , Then a narrow pulse signal with adjustable duty cycle can be generated .

 

principle ： Through low-pass filtering , Get rid of higher harmonics , It becomes a sine wave

 

principle ： Active integrating circuit converts sine wave signal into cosine signal .

The simulation results ：

  This is the circuit I welded , But don't weld the circuit like this when retesting , Because it will affect your speed , Be clear headed when retesting , What we need is speed , The first waveform must be beautiful , Because this will affect the waveform behind you .

 

 

  The actual results , in general , There are still some differences between the results of computer simulation and the reality , Don't be a simulation party , Be a practical party .

 

  I think it's OK on the whole , The next step is to practice with another video game question , I hope the next article can be written for your reference .