Alt-BEAM Archive

Message #03377



To: beam@corp.sgi.com
From: westy civic83@execulink.com
Date: Wed, 19 May 1999 08:02:12 -0700
Subject: [alt-beam] phototropic bicore


Hello, I was wondering if anyone can point me to info on phototropic
bicores, I have the schematic from beam-online, but have a question about it.

I only need the head to rotate about 15 degrees either way of dead center,
then stop turning. will the head do that automatically?, there are
mechanical stops that will prevent it from turning past that, but the
bicore will still try turning the motor, which I can see burning something
out eventually? I was thinking of limit switches singnaling that the end
of travel has been reached. Any ideas?

Also, any ideas for a curcuit that controlls the speed of a motor
proportional the the amount of light falling on a cds cell, I was thinking
of a 555 circuit of some sort, using the cds cell to vary the resistance
causing the timing of the 555 the vary???

Thanks for any help.

Shawn Westbrook
civic83@execulink.com


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