[sdiy] Sequential Pro-FX 500 schematics

Nicolás Dinapoli Fariña n.dinapoli at ymail.com
Mon Sep 12 04:55:43 CEST 2022

I have the same ones as you, plus this one:

|  |  |


|  | 





    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:


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,

Synth-diy mailing list
Synth-diy at synth-diy.org
Selling or trading? Use marketplace at synth-diy.org
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20220912/05931f32/attachment.htm>

More information about the Synth-diy mailing list