23RD AVRIL 2021 – NEW ELBY 522
20th Mai 2020 – Added some stuff
5th August 2019 – Added wiring diagram for 2″ version.
4th August 2019 – Added new 2″ panel (without VCA).

New Elby 522 PCB Build:

The new 522 is two PCBs, to have more than one input you still require an extra mixer PCB, I use Elby CGS 381 (Processor). As it needs to be added anyway I thought why not make use of it’s attenuverting capabilities, so the main input is now bipolar = variable polarity feedback…

Wire panel pots:

Attach main 522 PCB and wire up, I used 4mm standoffs, and 11mm between the two 522 PCBs:

Note I only wire CW and CCW of pots to P103 (the rest is already bussed down the panel pots), you can see which way round they should go in the above picture.

Add top board and then prepare the 381 PCB, note you only need these components – also note R13:



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OLD 2″ panel:

Page refers to original CGS202 PCB, apparently PCB has undergone a redesign by Elby to CGS522 so this page might have to be updated at some point.

The PCB (CGS 202) is/was available from Modular Addict and Elby, and more detailed construction notes are here

The 2 inch panel also requires a CGS 04 DC Mixer, available from Modular Addict and Elby

This panel utilises Clee’s 4U Bracket, also available from Synthcube and Modular Addict










But the panel at SYNTHCUBE  !

This build uses a CGS 202 PCB, a CGS 64 VCA for VC feedback, and a CGS 81 (or CGS 04) to mix the signals, as documented in the wiring diagram.

See Elby for further build information.

If you like you could use the other half of the CGS 81 as an attenuverter to invert the phase of the AUX signal (see diagram). Totally inverting the phase leads of course to cancellation, in this case maybe also changing the gain of the attenuverter would be interesting. Or you could use the CGS 81 to fade between LOWER and UPPER outputs (using a dual pot for AUX) for the feedback (I’ve not tried that myself though).

Listen to a demo of the feedback here!