The problem with LDR=B4s is that they are pretty slow, and show a kind light memory effect, which can be troublesome, than the other problem could be linearity and the spectral response. LDR=B4s make sense when cost is most important, and all the disadvantages are not so important. Friedel At 08:53 a.m. 16/11/01 -0800, you wrote: >On Fri, 16 Nov 2001 15:23:53 +1200 Steve Baldwin >writes: > > > > You may want to experiment with LDR's. I was using one in a > > project and noticed that it was really sensitive to changes at low > > light levels. ie. There was a difference between being in a closed > > drawer inside one piece of black heatshrink and having two layers > > of heatshrink. I didn't investigate any further than that though. > > > > What has been your experience with repeatability with LDR's? My >experience with CdS LDR's has been less than spectacular. They have a >"light adapted" resistance that is different from the "dark adapted" >resistance. > >Harold > > >FCC Rules Online at http://hallikainen.com/FccRules >Lighting control for theatre and television at http://www.dovesystems.com > >________________________________________________________________ >GET INTERNET ACCESS FROM JUNO! >Juno offers FREE or PREMIUM Internet access for less! >Join Juno today! For your FREE software, visit: >http://dl.www.juno.com/get/web/. > >-- >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >email listserv@mitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body