[sdiy] Subtle Chorus (including Dimension D emulation)

[mark verbos]

Hi Jürgen,


that's great news. I NEED a Dim D.


Mark




On Jul 26, 2008, at 4:45 AM, JH. wrote:

> Hi,
>
> just wanted to give you a quick update of my upcoming (fall 2008)  
> "Subtle
> Chorus" PCB project, which, among other things, will be able to  
> emulate a
> Dimension D, (using original ICs and all), plus "Dim T" (Same  
> topology but
> with two 20-stage phasers instead of BBDs), plus generic true-stereo,
> dual-BBD chorus.
> Depending on what configuration you want, this will use one, or up  
> to four
> PCBs. (Dim D emulation needs two PCBs.)
>
>  The "Subtle Chorus" is a variable project consisting of 3  
> different PCBs
> that can be combined for various functions.
>
>   a.. You can build a rather simple, true-stereo, dual-BBD Chorus with
> voltage controlled Chorus Rate and voltage controlled Chorus Depth,  
> using a
> single PCB.
>   b.. You can emulate the famous "Dimension D" (Trademark of  
> Roland / Boss)
> sound with it's unique filtering and presets, using two PCBs, the  
> "Dim D"
> (You even have the choice between vintage HA1457W opamps, or more  
> common
> TL071 / TL072 opamps.)
>   c.. You can build a similar effect that uses 20-pole all pass  
> filters
> instead of BBDs, using three PCBs, the "Dim T".
>   d.. And you can build an overkill effect device that allows to  
> choose
> between the Dim D and Dim T effect, using 4 PCBs, the "Dim TD"  
> version.
> So far, the BBD board design is finished; main board will be the next.
> Documentation is here:
> http://www.jhaible.heim.at/subtle_chorus/jh_subtle_chorus.html
>
> The BBD board needs 2 x MN3007 and 2 x MN3101. These are quite easy  
> to get,
> compared to other vintage BBDs.
> The Dim T version doesn't need any BBDs, of course.
>
> JH.
>
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