[sdiy] Adding offset to vactrol??

[John Loffink]

Where do you buy the H11F3?  Mouser and Digi-Key only have the surface 
mount part, and don't stock or are backordered on the through hole part.


Dave Magnuson wrote:
>
> While you're playing with vactrols, try the H11F3 opto-FET.    It's 
> not the same as a vactrol, but can be used in similar ways.       The 
> H11F3 is quite fast.  The FET acts essentially like a voltage 
> controlled resistor and can be used instead of a vactrol in some 
> instances.
>
> I typically drive the FET with a simple transistor circuit (the same 
> type of driver you'd use for a panel-mounted LED indicator)
>
> They're cheaper and more readily available than vactrols, too.
>

-- 
John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com