Hi Forest,
that would be great to do it that way. I mean the OP950 just outputs a
current signal, so are you suggesting to use 1 single opamp to be a
transimpedance amplifier that outputs the voltage in a reasonable range and
then process it digitally?
Ben

On Tue, Feb 17, 2009 at 2:08 PM, Forrest W Christian <forrestc@imach.com>wrote:

> Just a couple of comments...
>
> Being a digital guy, I would be much more inclined to take the output of
> the OP950 and run it through a single opamp to get it in the correct
> voltage range for an ADC input, and then stick it into an ADC on a
> suitable PIC.   A lot of the newer pics should have plenty of horsepower
> for this, and should be within pennies of the cost of the PIC you have
> listed.  The only question is what the signal looks like out of the
> OP950.  But if this will work, your parts count goes down to the OP950
> (and LED), a single opamp with preferrably r-r outputs, a couple of
> resistors, and a PIC, oh and a display:
>
> Qty 1000 prices:
> OP950 - .50
> IRLED - .10
> Opamp - .50
> Resistors - .10 (this is rounded way up)
> LCD - 1.00
> PIC - 2.50  (you can probably get away with much less - this is a "high
> end" dspic)
>       --------
>        4.70
>
> Not counting the PCB, assembly, and mechanicals.
>
> -forrest
>
>
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