Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ukma!rutgers!cs.utexas.edu!oakhill!mattp
From: mattp@oakhill.UUCP (Matt Pressly)
Newsgroups: sci.electronics
Subject: Re: Light Duration Meter
Message-ID: <1974@godiva.oakhill.UUCP>
Date: 13 Apr 89 17:09:07 GMT
References: <102@raider.MFEE.TN.US> <9318@dasys1.UUCP>
Reply-To: mattp@godiva.UUCP (Matt Pressly)
Organization: Motorola Inc., Austin Tx.
Lines: 9

In article <9318@dasys1.UUCP> aj-mberg@dasys1.UUCP (Micha Berger) writes:
>Here's my 2 cents. Use an op-amp integrator to integrate instead
>of the capacitor.  Have a photocell as the input voltage to be integrated.

It looks like even small leakage through the feedback capacitor in the
integrator would cause pretty inaccurate readings, especially after
integrating over a period of around 12 hours.
-- 
address: mattp@oakhill