R.G.: Phase 180 layout?

[mdh]

I recently built a Phase 90, and although it's not quite boxed up yet, I love it, and I want to build a version with more stages, and possibly some other mods. R.G.'s Phase 180 Plus seems to be just the ticket, but I haven't come across a layout for it. There's a thread in the archives from 1999 (http://www.diystompboxes.com/smfforum/index.php?topic=14714.0) in which R.G. says that he has a layout for it if there's demand. I can't find it on GEOFEX (though the schematic is easy enough to find), so I'm guessing that the overwhelming demand that MUST exist was never effectively communicated

I'm perfectly willing to produce my own layout, but I'm guessing that it'll be six months or more before I get around to that. If there's an existing layout, though, I may be able to build it next weekend!

[R.G.]

You're right, there was never a huge yell for it. I'll see if I can find it.

[audioguy]

That would be cool!

[mdh]

You're right, there was never a huge yell for it. I'll see if I can find it.

Thanks, that would be most excellent!

[Mark Hammer]

Both the "Phase 180" and the add-on board for the Ropez that Francisco Pena drew up present excellent case studies in the productive use of the 125B chassis with the internal ribbing (http://www.smallbearelec.com/Detail.bok?no=53).  These allow for the insertion of several "stacked" boards, for example one per 4 stages.  Such modular or semi-modular phase-shifter builds would be neat to see, and I encourage people to start thinking about such builds.

Keep in mind that the boards do not have to sit right on top of each other.  For example, looking at the picture in the linked-to page, one board can be slid into the slots at the end with the components facing inwards.  A second board is sitting in the slots several "rows" down with the components facing in the opposite direction.  Pots and switches are installed in the panel area between them, and the boards are connected via a couple of stiff (solid-core?) linking wires.

There are probably lots of semi-modular or "modularizable" builds that can be made in such a manner, like generic EQ boards that can be adapted to add more bands, minimixers, and so on.

[audioguy]

I love those boxes~!

[R.G.]

Both the "Phase 180" and the add-on board for the Ropez that Francisco Pena drew up present excellent case studies in the productive use of the 125B chassis with the internal ribbing (http://www.smallbearelec.com/Detail.bok?no=53).  These allow for the insertion of several "stacked" boards, for example one per 4 stages.  Such modular or semi-modular phase-shifter builds would be neat to see, and I encourage people to start thinking about such builds.

Modular... sniff, sniff... there's something modular around here... I know it...

Do you happen to have mechanical measurements on that box that would let me adapt the layout to fit?

[mdh]

Do you happen to have mechanical measurements on that box that would let me adapt the layout to fit?

Well, the Hammond 1590N looks to be pretty close. There is a technical drawing here: http://www.hammondmfg.com/dwgr.htm.

Does anyone know how close the Hammond a Taiwanese enclosures are?

[R.G.]

Well, the Hammond 1590N looks to be pretty close. There is a technical drawing here: http://www.hammondmfg.com/dwgr.htm.
Does anyone know how close the Hammond a Taiwanese enclosures are?

OK, a four stage phase line fits on one crosswise slice, the input/output/LFO fits on a second slice. If my back-of-envelope circuit is right, you can stack four stage circuit boards end to end as long as you have box space and power supply to run them.

The big problem is with cap size. Using axial ceramics will be the best in terms of stacking. I think you can put boards every third slot, maybe even every second slot. Tall caps will make this impossible, of course.

I did some jazzing up. I put a trimpot on each four-stage board so you only have to do matched quads of JFETs, not octets, dodecatets, or hexadecatets.  8-)

I'm still mulling buffering the LFO output for drive and possibly buffering the reference.

[mdh]

Sounds great, R.G., I'm looking forward to seeing the final product!