Searching \ for ' [EE] - Difference amplifier [was - no to' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page:
Search entire site for: '- Difference amplifier [was - no to'.

No exact or substring matches. trying for part
PICList Thread
'[PICLIST] [EE] - Difference amplifier [was - no to'
2001\08\01@104204 by Dan Michaels

Bernard Tyers wrote:
>Hi all,
>first post.
>I am trying to use a CA3140E op-amp as a comparator.
>The two inputs are chemical sensors. The difference voltage between them
>can range between 400mV, to 50mV (100% concentration to 0% concentration).
>I remember reading somewhere in a text book, that if V1-V2 is greater than
>(I think) 100uV the op-amp will go into saturation.
>Can anyone a) clarify this for me, or b)suggest a better way to measure
>the difference voltage.

Hi Bernard - I added a topic to your header. With opamps, you "always"
use them in feedback configurations if you wish to do anything useful
with them. Sounds like what you want is a difference amplifer ckt.

For theory, try searching on "difference amplifier", or
try here [mind the URL wrap]:

For accuracy, use 1% tolerance [or better] resistors in the ckt.

hope this helps,
- dan michaels

-- hint: The list server can filter out subtopics
(like ads or off topics) for you. See

More... (looser matching)
- Last day of these posts
- In 2001 , 2002 only
- Today
- New search...