Day 23: AC Op Amps, Oscillators, AC Power
Lab: OP Amp Relaxation Oscillator
In this lab we were asked to construct a relaxation oscillator using an Op Amp.
To do this we took advantage of a configuration of an Op Amp often referred to as a "comparator" that acts as a useful switch when one of the two input voltages is greater than the other.
To do this we took advantage of a configuration of an Op Amp often referred to as a "comparator" that acts as a useful switch when one of the two input voltages is greater than the other.
Prelab:
An interesting parameter of this circuit was to use the last 3 digits of one of our student IDs!
We used the frequency 438Hz.
from there we obtained the values for our capacitor and resistor.
To test the functions of the Op Amp oscillator, we designed it in EveryCircuit and "injected noise" by "shaking" it.
and then a couple of seconds later...
f = 441 Hz
Procedure:
With the behavior of our circuit confirmed, we set out to build it!
Then we measured the voltage of the output and the voltage across the capacitor for comparison.
Results/Summary:
The resulting voltages have a striking resemblance to the ones from the lab book!
Since we achieved the results we sought, no further modifications were needed for this experiment.
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