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Homebuilt Phototransistor Chronograph

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Unread postAuthor: rp181 » Mon Dec 28, 2009 10:56 pm

post what kind you ordered. Some phototransistors only work with IR, and may have a IR transparent epoxy(opaque to everything else). If so, you need IR LED's, datasheets usually specify matching LED's. If not, and normal LED will work depending on distance (farther= brighter).
Jimmy's page is the best I have seen, but here is mine:
http://rp181.110mb.com/index.php?p=1_24 ... speed-trap
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Unread postAuthor: inonickname » Tue Dec 29, 2009 1:59 am

rp181 wrote:post what kind you ordered. Some phototransistors only work with IR, and may have a IR transparent epoxy(opaque to everything else). If so, you need IR LED's, datasheets usually specify matching LED's. If not, and normal LED will work depending on distance (farther= brighter).
Jimmy's page is the best I have seen, but here is mine:
http://rp181.110mb.com/index.php?p=1_24 ... speed-trap


http://www.altronics.com.au/index.asp?a ... m&id=Z1613
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Unread postAuthor: rp181 » Tue Dec 29, 2009 12:13 pm

The VERY limited datasheet doesn't say much, but it says "packaged in a special dark plastic". That means it is probably only transparent to infrared, you may need infrared diodes or a strong light source (no frequency specific, a broad range, use a normal heated filament lamp rather than an LED). When you get it, if the plastic is clear, try normal LED's. If the plastic is dark, normal LED's probably won't work.
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Unread postAuthor: jimmy101 » Tue Dec 29, 2009 3:57 pm

Like rp181 said. Any incandescent will probably work OK. Fluorescents are out. Sun light will probably be the best thing other than IR LEDs.
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