1270	Laboratory Project 2: Visual Perception Experiment
	Laboratory Notebook Contents and Grading

 

  30            Communication

      4          Work recorded in notebook (rather than pasted in)

      8          Complete information: task descriptions, diagrams, data, reproducible one year later

      4          Written in Ink

      4          Student Signed every page

      4          Student Dated every page

      6          TA Signature for every lab session (-3 each session missed)

  12   IV.    Op-Amp in Comparator Mode

                  C.    Procedure

      1                  2)   Test voltage-divider (explanation, schematic, verified v2 varies around 0V)

      1                  3)   Explanation of task (built comparator)

      1                        Schematic of comparator circuit

      1                  4)   Explanation of testing (varied v2 around 0V, measured v0)

      3                        Table II filled in with measured v0 rail-voltage values

      1                  5)   Explanation of testing (varied v2 < 0 and v2 < 0, varied RLoad, measured v0)

      4                        Table III filled in with measured v0 (with load) values

    8    V.    Op-Amp as Schmidt Trigger

                  C.    Procedure

      1                  1)   Explanation of task (designed and built Schmidt trigger)

      1                        Schematic of Schmidt trigger circuit

      2                        Derivation of R1 and R2 values

      1                  3)   Test of circuit (v2 varied, noted whether LED turning on and off)

      3                  4)   Measured value of v1 for v0 high and low (note whether close to expected v1)

  20   VI.    RC Circuit

                  C.    Procedure

      1                  1)   Explanation of task (designed and built RC circuit)

      1                        Schematic of RC circuit

      2                        Derivation of R value for time constant τ = 50 ms

      4                  3)   Measure RC circuit output with 10 Hz square-wave input (Matlab® v2 plot)

      2                  4)   Measured value of initial voltage on C

    10                  5)   Measured and predicted v2 (Matlab® v2 plot)

  14 VII.    Schmidt Trigger with RC Circuit Input

                  C.    Procedure

      1                  1)   Explanation of task (designed and built Schmidt trigger with RC input)

      1                        Schematic of Schmidt trigger with RC circuit

      3                        Calculation of delay time between square wave input and v2 switching

      5                  3)   Measured v2 and v0 (Matlab® plot)

      4                  4)   Explanation of waveform for v0.

12 VIII.    Oscillator Circuit

                  C.    Procedure

      1                  1)   Explanation of task (designed and built Oscillator circuit, measured CFF)

      1                        Schematic of oscillator circuit

      6                        Symbolic expression for how long half-cycle of v0 square wave will last

      3                        Calculation of minimum and maximum value of duration of half cycles

      1                  3)   Measured critical fusion frequency (CFF) of LED

    4            Conclusion

      4          Comment on shortcomings/possible improvements of oscillator circuit