, 2-10 k
, 1-100 k
, 2-10 k
, 1-100 k
As we saw in the previous experiment, the op-amp isn't very useful (as an amplifier) in an "open-loop" configuration (i.e. without feedback). The most common configuration for op-amp circuits is the inverting amplifier where the output is an amplified and inverted version of the input (i.e. A is negative).
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Step 1: |
Wire the following circuit using 10 k
resistors
for both 
and 
.
| |
Step 2: |
Set the function generator to produce a 1 V p-p, 100 Hz
sine wave.
Measure the voltage gain, 
.
Since 100 Hz is within the frequency range of the DMM, you
could use
either the DMM or the scope
to measure 
and 
However, you should always use the scope to
view
the waveform being measured
to make sure it is what you think it is.
We will see several waveforms in this lab that aren't.
In particular, note that the output is inverted with respect
to the input.
| |
Step 3: |
Replace
with a 100 k
resistor.
Measure the gain.
| |
Step 4: |
Increase the input amplitude until output clipping occurs. Note the output clipping levels. Are these the same as the output levels in Exp. 4.1? |