Wait....a phase 99

[jimilee]

How did this get past me and why is there not a diy version???


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[Scruffie]

Is that the CMOS one that was in the Commande series? I don't think it's particularly highly regarded... although that might just be because no one seemed to like that series in general.

[jimilee]

I don't know, it's  a "custom" series.


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[Scruffie]

I was thinking of the phase 101, my bad.

So it's 2 phase 90s glued together? You know what to do...

[jimilee]

I was thinking of the phase 101, my bad.

So it's 2 phase 90s glued together? You know what to do...

No no, it's so much more....or, I need it to be.


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[thesmokingman]

the vintage switch wouldn't be hard to do(just need to make sure it switches both circuits or you have two toggles), nor would the parallel/series switch and output jack(well documented) ... and the synch switch would just mean you need a dual gang pot on the first phase and a 3pdt on/on switch to toggle between the unused gang on the first phase and the pot on the second phase. so find 2 phase 90 pcbs with a vintage switch and hack in the other switching/pot(s)

after reading the owner's manual there's two internal switches, sw6 will let you toggle the parallel output between the second output jack and a summed output on jack 1 ... that might be tricky(potential phase cancellation) and they don't say what switch 5 does other than it needs to be "up" ... so now I'd want a schematic.

[jimilee]

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[aion]

the synch switch would just mean you need a dual gang pot on the first phase and a 3pdt on/on switch to toggle between the unused gang on the first phase and the pot on the second phase.

Wouldn't you need to instead use a switch so that Phaser B takes its LFO from Phaser A? It won't actually be synced otherwise - if there are two LFOs controlled by the same pot then they will definitely drift from each other over time due to tolerance differences in the two wafers. A heck of a lot simpler too, assuming the LFO output is strong enough to drive two phasers.

[jimilee]

Quick, somebody make it happen. This is now getting exciting.


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[thesmokingman]

true and that's bound to be how they work it plus my proposed method wouldn't work well just taking into consideration that there's a potential stacked tolerance between the two gangs of a pot that would stand in the way of it synching up regardless of the lfo. sober thinking has its benefits.

[jimilee]

[samhay]

This does look pretty neat if you are using a stereo rig.

If you were going to do a new layout, you could do away with the 2nd input buffer and re-appropriate the op-amp to buffer and/or monkey around with the LFO...

Anybody know what the vintage switch does? Switches in/out regen maybe?

[thesmokingman]

one assumes its the popular block/script mod for the phase 90 put on a switch

[samhay]

There are a number of mods, which won't all fit on a switch, but I'm guessing that in the phase 99 a DPST is switching in/out the feedback resistor on each side.

http://aronnelson.com/gallery/main.php/v/Schematics-etc/MXR_Phase_90_to_Script.gif