[sdiy] linear vactrol driver circuits

[Aaron Lanterman]

On Jul 27, 2009, at 12:06 PM, Tom Wiltshire wrote:

> I don't know what other people do, but I've been experimenting with  
> driving the LED in a vactrol with a PWM signal. This is supposed to  
> give a more linear relationship between the driving signal and the  
> LED brightness. I was using a microcontroller, but you could easily  
> use a ramp or triangle wave oscillator and a comparator for an  
> analog PWM solution.

I wonder if that idea could be used to good effect in a  
microcontroller-controlled version of, say, a Buchla lowpass gate or  
259-style. It would save the cost of specific D/A converters.

- Aaron