Oops, this time with topic tag :o


             For my holidays I thought I'd build a nice PIC broadband radiation detector.
              I've researched the web and asked around, and have found two
             non-Geiger circuits that look promising.  Both involve a diode
             of some sort for a detector, followed by a FET-style opamp,
             followed by an audio or comparator stage for final output processing.


             My question involves the diode detector:  One seems to call
             for a 'large-area photodiode', something that I don't offhand
             have in the junkpile, and the other for what looks like a high-voltage
             automotive diode 1N3191.  Can anyone tell me why an automotive
             diode would work for this, OR whether something else fairly common
             might work?  I have a no-brand small-area photodiode with a
             glass lens available.

           Here is the link to one of the circuits:

             http://members.tripod.com/xexorz/schematics/dosage.html

             Any advice would be appreciated.

             Alice



Find the best deals on the web at AltaVista Shopping!
http://www.shopping.altavista.com

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body