Actually, the 490 resonance response is quite different from the904A. On the 904A, the oscillation is very weak and doesn't reallystart until you hit 2 o'clock or so. It is also true that many904A's don't even oscillate. One of mine didn't until Paul"fixed" it. I'm not quite sure why the response on the490 is so touchy. I'm going to look into the mod for the rangetoo.
Eric
At 09:01 PM 8/24/02 -0500, John Loffink wrote:
Im sure the 940 resonance was designed to be similar to the 904a, but Idon t mind changing the response to something more useful. I testedthis with a 100K pot and thought a 75K value gave the best range, but Idon t have that value in my resistor stock and didn t want to muck up theboard with parallel resistors. There is some difference at maximumresonance when you change R29. The sine wave is not as pure atrez=10, instead it seems to be more modulated by the input waves. But I tend to stay at low to medium resonance, so it didn t matter tome.
JohnLoffink
jloffink@...
I agree... This filter sounds AMAZING. :) I think Imight do the resonance range mod too. For my use, I don't think there'senough of a sonic change past the halfway point in the res pot to warrantkeeping it this way.
I can see myself ordering one or two more of these filters inthe near future.
Andrew
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