[sdiy] Analysis of Dim D modes

[Nathan Wooster]

Here is a store which sells interlocking pushbuttons (meant for a 1176)

http://hairballaudio.com/shop/index.php?cPath=21

It looks like you would have to make one rectangular hole to fit it

Nathan

----- Original Message ----- 
From: "JH." <jhaible at debitel.net>
To: "analog heaven" <analogue at hyperreal.org>; <synth-diy at dropmix.xs4all.nl>; 
"MOTM List" <motm at yahoogroups.com>
Sent: Wednesday, September 24, 2008 8:28 AM
Subject: [sdiy] Analysis of Dim D modes


> Hi,
>
> this is a question to those who plan to emulate the behaviour od a Dim D
> with my upcoming Subtle Chorus project.
>
> As you all know, on a vintage Dim D you can get more than 4 modes by
> pressing several of the 4 pushbuttons at once.
>
> I've analyzed the circuit, and found that there are exactly 6 diffenet 
> modes
> (surprisingly few if you consider the possible combinations).
>
> The results of my analysis are here:
> http://www.jhaible.heim.at/subtle_chorus/dim_d_switches.pdf
>
> Now, I don't expect a lot of people to have access to real, interlocking
> mechanical pushbuttons, and if you do, there's still the problem of 
> exactly
> spaced, and possibly rectangular holes in a front panel.
> So I would like to replace these pushbuttons with rotary switch: with 6
> positions, of course.
>
> This means re-designing the LFO circuit (no problem), but it also means 
> that
> it would be hard to connect 4 pushbuttons. (Well, maybe evan that would be
> possible with some diode logic - haven't thought this thru.)
>
> So, is everybody fine with a 6-position switch?
>
> And if so, please give some ideas in what order to place the 6 modes.
>
> (If you're logged into the electro-music forum, you can even cast your 
> vote
> here:
> http://electro-music.com/forum/viewtopic.php?t=29103 )
>
> JH.
>
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