Date: Fri Sep 7 22:10:19 2007

Author: Dan Bernoulli

Subject: Re: Laser Pointers

Post:
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I keep all the old housings from HeNe lasers that die and aren't economical=
to repair. I put a cheap laser diode assembly from Jameco or whoever in th=
e end with the hole. Get the kind that you can adjust the focus, i.e. spot =
size, and make it large enough that the emeritus profs don't have to strain=
to see it. I then mount a dual 1-1/2V battery holder (AAA AA, C or D size =
along with an on-off slide switch in the other end. They make great project=
s for undergrads looking to make a contribution. You can even write "assemb=
led by _____ on them to recognize their good work. The housings are big eno=
ugh that they don't wander off but small enough to handle easily. I absolut=
ely hate the small cylindrical pen size ones as they get stuck in pockets a=
nd walk off. Or the barrels decide not to make good electrical connections =
and they quit working or someone puts the batteries in backwards and it doe=
sn't work so they throw it away... Unlike Bic pens the cost is still large =
enough that it is impractical to make them as common as peanuts in a bar.

Dan Beeker
Physics Department
Indiana University
debeeker@indiana.edu

Date: Fri, 7 Sep 2007 16:27:09 -0400
To: tap-l@lists.ncsu.edu
From: Gerald_Zani@brown.edu
Subject: [tap-l] Laser Pointers



Tappers,


What is your preferred common laser pointer for talks?


Where do you buy?=20


What is the approximate price?


I want something that uses either AA or AAA batteries rather than button
cells.


The cheapo laser pointers that cost about $2 or $3 and use button cells
have been unreliable. The switch button fails. The spring
contact for the battery contact is made of some cheap metal that suffers
corrosion. have to swab the contacts with alcohol and acetone
to clean them off. Ugh.


I want something of good quality for reasonable cost that lasts and is
reliable.=20


Thanks,

-- JZ


_________________________________________________________________
Can you find the hidden words?=A0 Take a break and play Seekadoo!
http://club.live.com/seekadoo.aspx?icid=3Dseek_wlmailtextlink=

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I keep all the old housings from HeNe lasers that die and aren't economical=
to repair. I put a cheap laser diode assembly from Jameco or whoever in th=
e end with the hole. Get the kind that you can adjust the focus, i.e. spot =
size, and make it large enough that the emeritus profs don't have to strain=
to see it. I then mount a dual 1-1/2V battery holder (AAA AA, C or D size =
along with an on-off slide switch in the other end. They make great project=
s for undergrads looking to make a contribution. You can even write "assemb=
led by _____ on them to recognize their good work. The housings are big eno=
ugh that they don't wander off but small enough to handle easily. I absolut=
ely hate the small cylindrical pen size ones as they get stuck in pockets a=
nd walk off. Or the barrels decide not to make good electrical connections =
and they quit working or someone puts the batteries in backwards and it doe=
sn't work so they throw it away... Unlike Bic pens the cost is still large =
enough that it is impractical to make them as common as peanuts in a bar.Dan BeekerPhysics DepartmentIndiana Universitydebeeker@in=
diana.eduDate: Fri, 7 Sep 2007 16:27:09 -0400To=
: tap-l@lists.ncsu.eduFrom: Gerald_Zani@brown.eduSubject: [tap-l] L=
aser Pointers

Tappers,
What is your preferred common laser pointer for talks?
Where do you buy?
What is the approximate price?
I want something that uses either AA or AAA batteries rather than button
cells.
The cheapo laser pointers that cost about $2 or $3 and use button cells
have been unreliable. The switch button fails. The spring
contact for the battery contact is made of some cheap metal that suffers
corrosion. have to swab the contacts with alcohol and acetone
to clean them off. Ugh.
I want something of good quality for reasonable cost that lasts and is
reliable.
Thanks,
-- JZ

Can you find the hidden words?=A0 Take a break and=
play Seekadoo! Play now!
=

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