MXR Phase 90 - 4 / 8 Stage

I was going to just add this to the bottom of the Phase 90 post, but on reflection thought it better to start a new one to keep discussion about this build in one place.

A few people have requested a layout for the Phase 100 and I thought this could be a happy medium until I start on the circuits that are currently a low priority due to my preference for PCBs when it comes to larger circuits to keep the box dimensions down.

I was happy with the size of the Phase 90 layout and so I thought it would make sense to make this modular rather than using a large single board as it will then allow you to add more daughterboards if you want to, maybe two to make a 12 stage phaser if you like, or three for 16 stages.

The standard Phase 90 layout was used as an example in this layout, but you could do exactly the same thing with the modded version with the depth pot if you prefer.  This inserts the new stages in between stages 2 and 3 of the main Phase 90 board which means that all other components of the Phase 90 can remain exactly the same, making it easy to add this to an existing build if you want to.  All you need to do is add a cut and make the switch connections shown at the top of the Phase 90 layout and the daughterboard, daisy chain the supply and ground and link the sources and gates as shown.  Voila, you have a Phase 90 with 4 or 8 stages selected by the Stage Switch.

I haven't done this from a verified schematic and so it's all just theory at this stage, so it's definitely one for the experimenters out there.  And of course the people who don't mind matching at least 8 JFETs :o)