Voltage Regulator and Op-Amp circuitry

[axd3163]

Hello,

I am working on a senior design project right now, and I am working with a circuit which is apparently not working. It is to amplify the output of a load cell and to amplify it from around 30mV to 3V. I am getting an output from the op-amp, but the voltage regulator is not responding properly. I'm new to the voltage regulator -- can someone perhaps take a look at the design and point out any errors in it, if there is? Or what it takes to have it operate correctly?

Thanks,
Andrea

**broken link removed**

 

[KMoffett]

Can you be more explicit about "the voltage regulator is not responding properly"?

Ken

 

[Torben]

Hello,

I am working on a senior design project right now, and I am working with a circuit which is apparently not working. It is to amplify the output of a load cell and to amplify it from around 30mV to 3V. I am getting an output from the op-amp, but the voltage regulator is not responding properly. I'm new to the voltage regulator -- can someone perhaps take a look at the design and point out any errors in it, if there is? Or what it takes to have it operate correctly?

Thanks,
Andrea

**broken link removed**

Hi Andrea! Welcome to the forum.

Have you tried bypassing the input with a 0.33uF cap? I don't know how far away your power supply is but it might help.

And as KMoffet asked: can you define "not responding properly"?


Torben

[Edit: Fixed typo.]

 

[aussiepoof]

Hello,

I am working on a senior design project right now, and I am working with a circuit which is apparently not working. It is to amplify the output of a load cell and to amplify it from around 30mV to 3V. I am getting an output from the op-amp, but the voltage regulator is not responding properly. I'm new to the voltage regulator -- can someone perhaps take a look at the design and point out any errors in it, if there is? Or what it takes to have it operate correctly?

Thanks,
Andrea

**broken link removed**

A quick guess... note that the pinouts for the positive and negative regulators are quite different. Make sure you've wired them up right!

P.