Quadratic Residue Diffusers

Posted: Thu Mar 06, 2003 12:26 am

I have some blinding mathmatical equations to work with, but I would rather have some clean specs to build from. Does anyone have some truely professional designs to work off of. I just don't want to pull out a tape measure in the middle of a session to rip off the RPG dimensions. I'm never alone,but I'm so lonely. Rolling Eyes

Posted: Thu Mar 06, 2003 1:54 am

I might know a guy.....

QRD 734= P7, well width 3.4"

theres your start, now start # crunching Very Happy

Posted: Fri Mar 07, 2003 10:39 am

I definitely want to do it myself. I enjoy building things. It's great when I can use my carpentry skills to increase my recording potentials.

Posted: Fri Mar 07, 2003 11:34 am

Quote:

Originally posted by groove guru:
Does anyone have some truely professional designs to work off of. I just don't want to pull out a tape measure in the middle of a session to rip off the RPG dimensions.

I won't divulge tons of building process work that I've done, but here's some nuggets:

Use 1/2" MDF.
If you go with the P7 version, set your modulus to 21 and you'll get:
well depth (inches)0.0 3.0 12.0 6.0 6.0 12.0 3.0.

With a modulus depth of 14, and you get:
well depth (inches)0.0 2.0 8.0 4.0 4.0 8.0 2.0

Split the zero depth well on each end and you get a diffusor very similar to others out there.

Of course, I'm partial to the P11 quadrafusor... Very Happy

Jeff

Posted: Fri Mar 07, 2003 3:13 pm

JZ, Thanks for the help. Your stuff looked very good. I just want to give it a shot while I have spare time.

Posted: Fri Mar 07, 2003 3:23 pm

I'm taking it you are using the excel tables from studiotips.com. Correct? You change the MODULUS at the top in the first calculation. That changes it down the whole page. If you want a diffusor 24" across, I think I have a P7 design laying around somewhere. Its just trial and error to get the measurements right for width. Splitting the zero depth well is the way to go, but a bit more diffucult.

Of course, if I weren't a Browns fan I'd just give you my plans for a P7 design..... Very Happy

Jeff

Posted: Fri Mar 07, 2003 10:59 pm

Actually, that's a great resource. While I am familiar with prime number sequences and some of the basic theory involved with phase grating,I have yet to apply any of it.I'm going to review all the info I have at this point. Thanks you for helping out JZ !

Very Happy

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