Everybody,

Spehro emailed me a circuit that worked perfectly. I appreciate all of
your help,
I am currently reading Art of Electronics, hopefully it will "shed some
light" on
my analog weaknesses!

Thanks again guys!
Steve


>>> peiserma@RIDGID.COM 4/13/2004 1:33:09 PM >>>
pic microcontroller discussion list wrote:
>> I have a linear signal that goes from +0.45V to +1.15V. I
>> need to convert it to a signal that is +0.3V, when level
>> is +0.45V and +10V when the signal is +1.15V.

[snip]

> I can't figure out why I see no replies. Anyway, to get started,
> run the input signal to the non-inverting input, then create a
> reference voltage (your "some type of offset") by making a voltage
> divider with two resistors to get something in between. (.3+1.15)/2
> Figures out to .72 V.  Tie that to the inverting input and now it
> will switch as it crosses the reference point.
>

also see the thread "Voltage Conversion Circuit" a few days before
Valentine's Day. It covers this type of circuit.

You mentioned your op-amp was a R-R powered by 10V, and that you
weren't getting the full range. Even a R-R won't truly go to 10V,
but it should be pretty close. How close to 10V (and 0.3V for that
matter) do you need to get? Maybe you should tell us a little more
about what is supposed to happen to the output when the input is
between 0.45V and 1.15V.


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