×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

OP AMP VOLTAGE REGULATION

OP AMP VOLTAGE REGULATION

OP AMP VOLTAGE REGULATION

(OP)
I AM GETTING A 0 TO -20 VDC SIGNAL FROM AN OSCILLATION SENSOR AND SENDING IT THROUGH AN INTRINSICALLY SAFE BARRIER. THE PROBLEM I HAVE IS I AM USING AN ANALOG I/O CARD THAT DETECTS +/-10VDC. I AM TRYING TO FIGURE OUT IF I CAN USE AN OP AMP TO CONVERT THE RANGE OF MY DC. MY SITUATION REQUIRES VERY LOW ERROR. YOUR HELP/ADVICE IS GREATLY APRECIATED.

RE: OP AMP VOLTAGE REGULATION

You can use an op amp to offset the voltage by 10 volts.  That would gibe you the maximum number of A/D bits if that is what you mean by error.  Of course the accuracy of that 10V offset and the drift of the op amp become a factor.  A simple resistance voltage divider would reduce that -20V to -10V.  That would cut the available A/D bits in half.

RE: OP AMP VOLTAGE REGULATION

IFYOUWANTTOMAKEYOURPOSTINGUNREADABLETHENJUSTOMITSPACESAND
PUNCTUATIONTOOBESIDESTHELOWERCASES.

<nbucska@pcperipherals DOT com> subj: eng-tips
read FAQ240-1032

RE: OP AMP VOLTAGE REGULATION

Guys,

Why is this in the SSR's forum? Circuit Engineering would be a far better home for this discussion.

----------------------------------

If we learn from our mistakes,
I'm getting a great education!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources