[sdiy] Photodarlington Optocouplers

[Paul Perry]

Unfortunately, for most DIY audio applications, the 
rapid response of the H11F3 and similar is a disadvantage.
The great strength of the traditional CDS vactrol is
that it smooths out the control signal.
But I imagine the H11F3 would go well in PWM
applications, driven by a micro.

paul perry Melbourne Australia
----- Original Message ----- 
From: "Kyle Stephens" Sent: Tuesday, April 20, 2010 11:16 AM
Subject: Re: [sdiy] Photodarlington Optocouplers


> Ditto on the H11F3. It's a just like a Vactrol, except:
> 
> -Smaller footprint, in a standard DIP package
> -Advertised 99.9% linearity
> -Response time in uS, versus ms
> -~100R - ~300M resistance range
> -And my fav: a lot cheaper!