[sdiy] Sequential Pro-FX 500 schematics

[Tom Wiltshire]

Ah yes, I forgot about the system controller -  yes, I have that one too, thanks.

The most interesting part of that is the "standard module interface", which consists of a peripheral interface chip which can read (up to) 8 buttons and 8 pots, and write to 8 LEDs and 8 outputs, which can be either CVs or MDACs. It's pretty flexible, whilst staying relatively simple.


> On 12 Sep 2022, at 03:55, Nicolás Dinapoli Fariña <n.dinapoli at ymail.com> wrote:
> 
> I have the same ones as you, plus this one:
> 
> SEQUENTIAL_500-PRO-FX_SERVICE_MANUAL.pdf <https://drive.google.com/file/d/1Nfupell-b033EFK7mcszY_GI9oRoAobl/view?usp=sharing>
> 
> 	
> SEQUENTIAL_500-PRO-FX_SERVICE_MANUAL.pdf
>  <https://drive.google.com/file/d/1Nfupell-b033EFK7mcszY_GI9oRoAobl/view?usp=sharing>
> 
> 
> 
> ***FIN DEL COMUNICADO***
> 
> 
> El domingo, 11 de septiembre de 2022, 08:32:35 ART, Tom Wiltshire <tom at electricdruid.net> escribió:
> 
> 
> Hi All,
> 
> There are schematics/preliminary service manuals floating around for *most* of the modules of the Sequential Pro-FX programmable rack effects system from the early 1980's, but information on certain modules is extremely sketchy. Here's a review, if you're curious:
> 
>     https://www.muzines.co.uk/articles/sci-pro-fx-500/6152 <https://www.muzines.co.uk/articles/sci-pro-fx-500/6152>
> 
> Does anyone have schematics or more information on these, please?:
> 
>     510 Phaser
>     
>     518 Reverb (spring tank mounted in a 1U 19" rack)
> 
>     522 Flanger / Chorus
>     
> I've got info about these others:
> 
>     512 Distortion
> 
>     514 4x2 Mixer
> 
>     516 Parametric EQ
> 
>     520 Transpose / Sync
> 
>     524 Digital Delay 
> 
> They're interesting designs because they're very much at that transitional period between fully-analog and more-digital. There's quite heavy use of the 7524 8-bit MDAC for digital level control (and more), but there are also lots of examples of CA3280's doing a similar job, and filtering provided by CEM3320s and so on. It's a right old mixture!!
> 
> Thanks for any clues or help you can offer,
> 
> Tom
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