vcf10a

[tomg]

Just to clean out the Moog closet I went ahead and did the PolyMoog
vcf. I didn't attach because it's 20K. I've bombarded you guys with
Moog stuff lately anyway. This one is also constant amplitude. While
I had it on the board I did every example I have of it. They are all
constant amplitude. It seems like they designed the filters to avoid
the variable amplitude characteristic of the minimoog's vcf.

Sonically the variable amplitude type sounds just like all the other
Moog filters (very good but they all sound much the same) the 
difference being as the filter sweeps up a touch of res starts to 
appear rather than having to keep it just on the edge of oscillation 
you can  adjust it to oscillate just a little....nice! and very natural 
for a lot of things, but if cranked it can hurt you!

The PolyMoog  vcf had vc res and an added vca. I also show an
opamp ouput option.

The Pic
http://www.mindspring.com/~vco/cbook/pics/vcf2d_sd.gif

The Page... There's other new stuff up too.
http://www.mindspring.com/~vco/cbook/cookbook.html

btw I still like the simple 3080 version best....

-tg (now where is that arp rm schematic???)