I seem to have missed the start of this discussion, but when someone wants to cut open photodiodes i can't help wondering if cutting open a power transistor would be of any use... These nice TO3 (2N3055-style) transistors have an nice big surface, and i know from experience that they make excellent photo-diodes... (once you've cut away the top of the metal box...) The HF-types are quite fast too.. It's quite easy to open them :-)
bye, Peter Faasse > -----Original Message----- > From: Uwe Zimmermann [mailto:[EMAIL PROTECTED]] > Sent: woensdag 22 januari 2003 0:10 > To: Multiple recipients of list CHIPDIR-L > Subject: Re: Replacement for BPDP-30 / HP5082-4203 > > > MR> Because alphas can be blocked only by a sheet of paper, I > must have a > MR> close access directly to the diode. I've seen the OSRAM BPX 61 (a > MR> silicon PIN photodiode) seems to be quite similar (from > the package) to > MR> the photodiodes in the article. > > MR> I have to order it by mail so has anyone worked with this > diode and can > MR> tell me whether it has a glass lense that I can cut away > or is the whole > MR> space covered with a plastic substance (epoxy). An > alternative diode for > MR> me seems to be the BPW 21 (lense or plastic?). The osram > datasheet says > MR> nothing to this aspect (but who wants to cut a diode in pieces?) > > MR> Regards > MR> Markus > > "thorium alphas" will travel about 3-8cm in air, according to their > energies > 3.954MeV (Th232) > 5.34031MeV (Th228) > 5.68542MeV (Ra224) > 6.28813MeV (Rn220) > 7.800MeV (At216) > 10.554MeV (Po212) > 6.05/6.08MeV (Bi212) > If you don't detect any signal with your diode and do not have any > other ability to test your Gl�strumpf, the error is not neccessarily > in the circuit: there are modern cerium based incandescent mantles > around which will not give you any significant amount of alpha > radiation. > > BPW21 and BPX61 will both do the job. There is no epoxy filling inside > the can, but the distance between the lens/window and the chip appears > to be shorter than in the old ones from the article - it might be more > difficult to remove the lens without damaging the thin front side > bonding wire. > > Uwe. > > > > -- > Mit freundlichen Gr�ssen > Uwe Zimmermann > mailto:[EMAIL PROTECTED] > > -- > Author: Uwe Zimmermann > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB CHIPDIR-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > > > -- Author: Faasse, P.R. INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
