[sdiy] Vactrols

[Tim Parkhurst]

> -----Original Message-----
> From: TIm Daugard [mailto:daugard at sprintmail.com]
> Sent: Wednesday, October 27, 2004 3:00 PM
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Vactrols
> 
> Has anyone tried ultra-sonic pulse width modulation of an LED / LDR
combination
> instead of varying the current through an LED?
> 
> Tim Daugard
> AG4GZ 30.4078N 86.6227W
> http://home.sprintmail.com/~daugard/synth.htm
> 

Short answer: No.

Slightly longer answer: I would think that the response time of the LDR
would be the limiting factor. Don’t really know how well they would respond
to a 30 - 40KHz signal. ON THE OTHER HAND, the slow response would
definitely tend to 'filter' the ultrasonic carrier frequency. 

Sounds pretty interesting all in all.


Tim (Slow response time) Servo

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