[sdiy] Web info on Voltage Control Methods?

[GoddRobert at aol.com]

In a message dated 7/13/2002 5:30:52 PM Eastern Standard Time, 
harrybissell at prodigy.net writes:


> 
> say "I want to voltage control _______" and then see who says
> "There is a schematic on my site...."
> 
> H^) harry
> 
> 

I'd like to use a 0-2v envelope in a toy keyboard to VC a simple res filter. 
My understanding of VC methods currently stops at LED-photocells. The Active 
Filter Cookbook describes MOSFET and JFETs as "older approaches to 
voltage-controlled resistance" and goes on to talk about using multipliers 
and switches. So that hasn't been helpful. I've had a tough time of finding 
specific, usable info on the net. But I'm still searching. I was hoping 
someone could point me in the right direction. I'm sure it's easier than it 
seems. 
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