11????
input is 0.2V and output is 2.2.
2.2/0.2 =?
0.2V x gain = 2.2 volts (solve for gain)
Last edited:
11????
input is 0.2V and output is 2.2.
2.2/0.2 =?
0.2V x gain = 2.2 volts (solve for gain)
I am lost now again . so is it ok if i use 8.2 and 3.3 E12 resistors?No, it was given earlier. 2.2 volts / 0.2 = 11.
Once you find the values for the resistors of a gain of 11, one of the outputs done.
Then you need to think about the output that has the 50 mv offset removed. I can think of two ways of doing that. Smarter people can probably come up with even more ways. Clue: You want to removed the DC component of the signal.
Hi Dick, There are many ways to remove the offset. I agree your way is very simple. I think the text book is teaching gain, summing amps and offset in amplifiers. It would be nice to see what the book teaches so we know which way was shown two pages back. I was thinking of pulling up or is it down on the (-) input to add in -50mV of offset. (summing amp) 50mV-50mV=0mV Or do we move the ground point of the R1,2 by 50mV? Is three methods too much at this point? RonS.Clue: You want to removed the DC component of the signal.
Thank you very much. At the start i taught it is just one assignment which i might never used in life. But after chatting with guys here make me realised that it's better i understand it rather than just getting the answer. So thanks to all of you guys.Hello,
You will find a lot of the opamp theory in the attached book.
Bertus
You guys now start different language . please see the attached file if i am going right direction. ThanksHi Dick, There are many ways to remove the offset. I agree your way is very simple. I think the text book is teaching gain, summing amps and offset in amplifiers. It would be nice to see what the book teaches so we know which way was shown two pages back. I was thinking of pulling up or is it down on the (-) input to add in -50mV of offset. (summing amp) 50mV-50mV=0mV Or do we move the ground point of the R1,2 by 50mV? Is three methods too much at this point? RonS.
You've shown us several schematics for a non-inverting opamp. What you need to do is determine the ratio of Rf to Rin (it's not really the input) that will give the required gain.please see the attached file if i am going right direction.
Thank you guys for all your help but this is not getting into my brain anymore. I spent a good dane half to work it out but no luck. CheersYou've shown us several schematics for a non-inverting opamp. What you need to do is determine the ratio of Rf to Rin (it's not really the input) that will give the required gain.
The magnitude of the resistors is left to you - hint, - the resistors won't be the same value. As we've already established, that will give you a gain of 2 and that isn't what you want for either part of the problem.
We usually choose them to minimize power dissipation while following other guidelines that consider the opamp input currents.
You have 1 equation and 2 unknowns. If you pick a value for one of the resistors, you have 1 unknown; so it's just arithmetic from there.this is not getting into my brain anymore.
E 12 series if i use 1.2ohm resistor will it work? ThanksYou have 1 equation and 2 unknowns. If you pick a value for one of the resistors, you have 1 unknown; so it's just arithmetic from there.
Not likely. Opamps work better when the output is lightly loaded. The uA741 can only sink/source about 25mA. 2V across 1.2 ohms isE 12 series if i use 1.2ohm resistor will it work?
So i have to increase the resistor value? which resistor will it be Rf or Rin ? If i use 8.6 Ohm resistor?Not likely. Opamps work better when the output is lightly loaded. The uA741 can only sink/source about 25mA. 2V across 1.2 ohms is
\(I=\frac{V}{R}=\frac{2V}{1.2\Omega}=1.67A\)
I thought you were using 10k resistors in an earlier circuit. Try using 10k for what you're calling Rin.So i have to increase the resistor value? which resistor will it be Rf or Rin ? If i use 8.6 Ohm resistor?
Thank you very much . But does E12 series has 10K resistor?I thought you were using 10k resistors in an earlier circuit. Try using 10k for what you're calling Rin.
Yes. The values they give are all in the same decade, but you can use any decade.But does E12 series has 10K resistor?
No. Show your work so we can see where you made the mistake.So Rn will be 10k and Rf will 110k is this correct?
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