[sdiy-interim] Laser voltage control

[Daniel Araya]

I have had good results using voicecoils from dead harddrives, try
that.
Scanners, photocopiers and faxmachines are good sources for surface
reflecting mirrors, a piece of harddisk platter might work, they are
quite light.

/Daniel

>>> David Brown <davebr at earthlink.net> 2007-03-29 01:49:59 >>>
I guess this is synth related.  I have a Ramsey Electronics LLS1 
laser light module.  This has two motors and a speaker with mirrors 
on each for creating patterns.  The motors are controlled by two 555s 
that vary between 50% and 90+% duty cycle.

I pulled the 555s and replaced them with a small daughter-board that 
has an ATTINY13 on it programmed with a control voltage to pulse 
width program.  A 0 to 5 volt control voltage at each of the two 
inputs results in a 50% to 100% duty cycle square wave in 2 degree 
increments to control the speed of each motor.  Now I can visualize 
my control voltages and LFOs.

I need to replace the mirror on the speaker with one that is larger 
so I can fan the display out more.  I'd like to replace the speaker 
with a linear motor of some type so I don't hear it.  Any 
suggestions?  It needs to be physically small and able to be driven by
a LM386.

Dave 


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