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Ross Phaser w/ extra stages

Started by Govmnt_Lacky, May 28, 2011, 05:47:00 PM

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Govmnt_Lacky

May 28, 2011, 05:47:00 PM
Been looking for quite a while for an audio/sound clip of a Ross Phaser w/ extra stage boards. I have read somewhere that it starts to sound like a Flanger at some point.

Can anyone atest to this? Does anyone have a link to a sounclip of an 8 or 12-stage Ross?

Thanks  ;D
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Mark Hammer

#1
May 28, 2011, 05:59:03 PM
I have an 8-stage Ross, and *I* don't think it sounds particularly flangey.  But then I've never put white noise through it.  It's not boxed up, or else I'd try and make you a soundclip.

What I will tell you is that:

a) you probably want to reduce the value of those 1uf caps around the Regen pot if you go above 4 stages, because the resonance down low sounds awful and has a propensity to oscillate; keep in mind that the phase-shift stages are supposed to be unity gain, but the more stages you have, the greater the risk that one or more will be juuuuuuuusssst enough above unity that the feedback produces instability.

b) the width of the sweep is less when the LFO is driving more stages; probably need to feed the output of the LFO through two parallel resistors, one to each set of 4 stages.

I can vouch that 4 swept stages and 2 fixed ones sounds kinda nice

Gabriel

#2
January 29, 2013, 09:19:11 AM Last Edit: January 29, 2013, 09:21:36 AM by Gabriel
Quote from: Mark Hammer on May 28, 2011, 05:59:03 PM

b) the width of the sweep is less when the LFO is driving more stages; probably need to feed the output of the LFO through two parallel resistors, one to each set of 4 stages.


Do you recomend doing that?

My Aim is to make my 8 stage ross phaser sound more Musical..

Mark Hammer

#3
January 29, 2013, 09:43:58 AM
The current from the LFO is what produces the sweep in the phase-shift stages.  That current is taken from the "LFO" side of the 10k resistor on the output of the LFO.  That point is tapped for the expansion board that adds 4 more stages.  But the same current is now divided among 8 stages, rather than just 4.  You might find that you get a better sweep by adding a second 10k resistor at pin 9, and running that to pad "W" on the expansion board.  At least that's what I'm guessing.  Let me know how it works out.

Gabriel

#4
January 29, 2013, 01:00:14 PM
i will try it and report with samples.

Thanks.
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