OP AMP Circuits (Small Signal to Big Signal)

By -

This is a continuation of the day before. No longer are we
just learning methods to solve problems. Now we have problems
and need solve them.

 We were task to predict how this
Op-Amp will react using a AC-signal. We have been using DC-signals do to the fact it was easier to learn with. Here we predicted that there was going to be a signal ranging from 0 to 200. But we were wrong.


The picture to the right was in fact our first problem but I mixed the two. We had the right idea of how the signal would look like but we forgot that since the lowest could only be zero volts we needed to shift everything up.











Summing Amp Lab

I like labs that has a lot of things going on the bread board. I have gone
use to the Op 27. In this lab we are suppose to see what would happen with
a summing op amp.


In our pre-lab we calculated the theatrical output voltage then we tested the our
hypotheses with the experiment.

This is the white board representation of our circuit. We wanted 10k resistors
but someone put 5k resistors in the 10k box.
The actual resistors were about 4.56k

Summary

This being an engineering class our pre-lab was correct mathematically but wrong generally due to the fact that the Op-Amp has a high saturation "buffer". As you can see the top saturation was around 3V and the bottom was around 3.5V This being a summing amplifier the two input voltages were suppose to add up. However, we would need a better amplifier to get the actual theoretical values.



Difference Amplifier Lab


This is basically the same circuit as the first lab of the day however we
added some resistors and disconnected the inverting and non-inverting
signals



The Little data chart on the bottom left of the whiteboard is our
pre-lab predictions. We are suppose to have a gain of 2 times
the difference. So if we keep one voltage at 1V we can easily calculate
what the V-out will be.



After we ran the experiment we notice that there is an very high
saturation rate. only two out of 7 points taken was not saturated.
The top saturation point was around 4.3V and the bottom
saturation was about 3.5V

 

Summary

We had a very good lab day. Everything ran perfectly and
we go the exact values that we were suppose to. Those most of it all was
saturated we learned that engineering is not idea. Our graph showed the
relationship with a Difference Amp



Comments

Post a Comment

Popular posts from this blog

SuperPosition

By -
Image
We are just reviewing what we did in our lass class meeting. It was a simple mess problem. Why cant all problems be mess. He should only ask us to fin the current of a circuit and not the voltages. I did not really understand what he was doing here. You are suppose to assume that the voltage is a random number then solve for everything else on the circuit then when you get to the other voltage source you see the ration that you are off by then multiply everything else by it and then you will get your answer. Lab (Super Position II) I don't know how to rotate this picture, but it is our first example of superposition. We are suppose to find the currents at places with superposition even though mesh law is better for this situation. This is how we set up our "breadboard". We try to make it look like the white board setup to make it easier to read and determine what resistor We are just measuring the voltage drop on each resistor. With t...
Read more

LRC

By -
Image
Looking back to this day in lab made me wonder how it looked so hard before. We just had to follow some simple steps to find "a" and "w" . Then find s1 and s2 for the circuit This was a different problem but here we determined if the circuit was over damping, under damped or critically damped F ollowing that we found the ratio of a/w. LRC Lab I n the pre-lab we had to theoretically find how the circuit would react to the given conditions  I t was a simple circuit as seen about. We has to measure the response across the Cap and Inductor.  Conclusion  In the end the circuit acted the way that we thought I would in the pre-lab. The graph below shows the discharge of the capacitor (I think).
Read more

PBP

By -
Image
This was some want something I was able to do. It took  me a while to get back into my mojo. OH... here is Q and B. I did not know what that meant  on the final. Lab In the pre-lab we needed to figure out how the circuit would  respond in many different frequencies. In the end we got good data and everything was the way it was suppose to be. It took a long time to just get the numbers. it felt like busy work.
Read more