[sdiy] Circle Machine prototype

[David Griffith]

On Tue, 17 Aug 2010, Synthmanic at aol.com wrote:

> In a message dated 8/17/2010 7:58:21 A.M. Central Standard Time,
> controlvoltage at gmail.com writes:
> On a related topic, a friend of mine made a  rather nice optical audio
> transmitter-thingy using a dollar-store laser  pointer, power
> transistor and phototransistor... used the power transistor  to
> modulate the power to the laser with audio (input audio to base  of
> power transistor), then aimed the laser at the phototransistor,  which
> essentially modulated +VDC to reproduce the audio.  Worked quite  well!
> I've wondered if there aren't any exotic materials you could pass  the
> laser light through in order to get some sord of  optical-modulation
> effects device.  Of course, delay would be out of the  question unless
> you had a number of miles over which to set this  up...

I've had thoughts of using lasers like this with guitar strings and the 
head of a banjo.

-- 
David Griffith
dgriffi at cs.csubak.edu

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