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From: Thoremail@example.com (P!erCer)
Subject: Laser Pointer Project - Blinking Stage
Date: 9 Dec 2002 22:29:55 -0800
NNTP-Posting-Date: 10 Dec 2002 06:29:55 GMT
So my laser pointer display project design is going well...I have
vibrating mirror modules planned and the basic flow layed out. For
the AC signal generators I will just take schematics off the net.
However, one area I have a question on: the blinking.
My laser pointer is a standard cheap red model with a laser diode. I
have a TI-83 calculator with a link port that I can turn on and off.
My simple plan is to put a transistor inline with the battery of the
laser pointer, then turn the link port on and off with my blinking
program to turn the laser on and off. I want to know: is this
dangerous for the laser or my calculator?
Other attachments to the calculator link port range from speakers to
IR controllers, and some of the speakers are directly connected
without any other components. They specify that a high-resistance
device is needed, however, or the link port could be damaged. Do
transistors draw any current at all on the gate?
Also, could this damage my laser pointer? I am reluctant to modify it
beyond adding the transistor, because I have heard any over-voltage
ruins laser diodes. Also, if I just need one inline transistor I
could make a thin little "card" that would slip between the battery
and one of the terminals and allow me to use ANY laser pointer with no
modification. The card would be two metal strips seperated by a thin
insulator, with wires going to my transistor.
In the future I might want to use saw wave generators and make a laser
display controlled by my calculator...that would be cool.
Thanks for your help,
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