Lab #8
Follow the instruction and procedures in the Student Manual, unless specified differently
in this note.
Reading:
p.175 – 187 in SM
Ch. 4.01 – 4.09 in AE
Lab #8
Although circuit diagrams do not show Pin #4 and 7 connections (DC power), they
should be connected to +/- 12 V.
8-1 Follow the instruction. You cannot measure the open loop gain (OLG) precisely but
can give lower bound of the OLG
8-2 Follow the instruction.
8-3 Follow the instruction. Be aware of the input impedance of your OSC.
8-4 Follow the instruction.
8-5 Follow the instruction. Skip the VP01 part.
8-6 Follow the instruction. (a) LPT100 is obsolete. It will be replaced by BPW46. Ask
your instructor about the substitute component. Modulation? You will see a small AC
signal on top of DC signal. Measure the amplitude of the AC part and compare it with
the DC level. Skip (b) and (c).
8-7 Skip.
8-8 Replace with simulation. See the simulation instruction.
8-8 Push Pull Buffer
The figure above is the schematic for Push Pull Buffer
Part 1: Simulate the circuit above using PSpice.
Part 2: Compare the output of the OP-AMP to the
output of the Push Pull Buffer. Which one has less
distortion?
Part 3: Vary the frequency of the input voltage
between 100 and 500 hertz. What happens to the
“shape” of the output? Does it sound better?
(int: in the simulation add a no-print delay of .5
seconds.
Part 4: Form the feedback from the actual output of the
circuit (from the top of R4) rather than out put of the
OP amp. Do you see the difference?