Introducing the Alternate Dimension: Flexible Dimension/Dual Chorus

[Ripthorn]

I like to try to find effects where there aren't many DIY offerings and come up with something. Dimension chorus is like that. There's the DC-2 clones and the Dimension P and that's about it. I repaired a Boss CE-5 a little while ago, which introduced me to the ES56028S chip that Boss now uses in all their modern chorus pedals. I use two of these instead of BBD's and ditched the companders of the DC-2, while using it's basic LFO architecture. Features include:

- Independent mix controls for both delay lines
- LFO speed and depth that goes from slower/shallower to faster/deeper than the DC-2
- Toggle switch to have only one chorus active on the left channel
- Support for full stereo in/out, mono in and stereo out, and mono in and mono out

This will give classic dimension chorus as well as standard chorus, something reminiscent of rotary, and other fun stuff. This is not a beginner project by any stretch. It's all surface mount and it's a fairly high parts count, but it should be much more straightforward than a DC-2 clone. The chips can be reliably sourced from UTSource online for about the same price as BBD's (I don't really know, to be honest). Everything including circuit walk through, Gerber files, build documentation, etc. can be found here: https://scientificguitarist.wixsite.com/home/alternate-dimension

[Andon]

A-ha! I saw this on your site last night, and was wondering when a video would show up. Well done!

[Processaurus]

Wow, nice work! I like that you wrote up an analysis of the circuit. The echo processor is interesting, I wonder if it is a sigma delta chip like the Princeton chips? It seems to have a lot in common with the PT2396.

[ElectricDruid]

Wow, nice work! I like that you wrote up an analysis of the circuit. The echo processor is interesting, I wonder if it is a sigma delta chip like the Princeton chips? It seems to have a lot in common with the PT2396.

The datasheet for it shows an internal layout that's extremely similar to the PT2399, so yes. All very familiar. I hadn't heard of it before so went and looked it up. The differences are a smaller RAM so it can get to the short delays that the PT2399 can't do, and some options pins for setting different modes and delay times. It looks like a nice chip, and the noise figures and stuff are really pretty good if they're to be believed (shorter delay, higher clocks, it does make sense - PT2399 is noisiest at long delays).