[sdiy] linear vactrol driver circuits

[Antti Huovilainen]

On Mon, 27 Jul 2009, Tom Wiltshire wrote:

> Harry is right. The vactrol's LDR response time is being used as a basic 
> filter to turn the PWM signal back into an analogue level. As such, you need 
> a high enough PWM frequency that you won't hear it. However, that isn't hard 
> to organise.

As long as there's no DC, there won't be noise as such (ignoring 
capacitive coupling). What you will get 
is intermodulation distortion.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova