Visual Cortex pre-encoder expander

I’d be interested in panel+pcb or kit! YUV version would be great too - any chance to combine them, or will they be separate exapnders?

1 Like

right! I would absolutely go for the dual if it was an option

1 Like

I started to lay the PCB for the YUV version, but decide to first finish this run of pcbs test them, prepare kits, and a solder prebuilt modules and then will do the YUV.

Both will be compatible and can be used at the same time since they read from the RGB expansion bus of the Visual Cortex

1 Like

Sounds absolutely reasonable. I am definitely still interested also in a single RGB version!

I’ve just got home and the postman had a surprise, and I remembered a quote from a famous American movie:

Life is like a box of pcbs and panels, you never know what your gonna get.
-Forest Gump

So final version pcbs (will double check them again everything is fine) and PANELS arrived.

This red panels are in honor to all LZX Cadets :raised_hands:

@pbalj now caps are nicely placed, thanks for the suggestion I completely forgot about it.

Panels fit perfect on previous pcb (which is same footprint as the new one) there will be 2mm Red PCBPanel and 2mm Black aluminium panels. I don’t know if I should give the option to chose or just include both on every kit…

I still need to get to details to costs on kits and built modules, but will probably target at 50€-60€ for kits and 70€-90€ for built modules (plus shipping from Spain probably 6€-15€ depending if you are EMEA or Mericaaa). After all kits are sold I’ll sell spare pcbs :).

So my next steps will be to check everything is fine with the pcb, if so I’ll probably send a Google Form in this thread so all of you can write which ones and how many kits/modules you will want.

After the form is closed I’ll be able make the order of the parts to Mouser (so 3 days) and then I’ll ask you within those days to send me a PayPal.

Ill keep you all informed, I’m very excited on this project because its a community project for the LZX community. :heartbeat::heartbeat::heartbeat::heartbeat:


Updates on this, the board works as expexted, it as two minor bugs I’ll fix for the final version (pots are inverted, so positive signal should be from 12’ to 5’ (clockwise) and inverted signal from 12’ to 7’ (counterclockwise), second bug is that the color pins are swaped so Red is Blue and Blue is Red. in the video you can see how I patch a V ramp to the Byle and output that on the expander Red’s output.

One thing I wanted to ask on this thread for all your consideration and feedback is the following. When the attenuverter inverts the signal which is 0v to 1v DC from VC it outputs a 0v to -1 (inverted duh)… but the standard video signal is always 0v to 1v, so the inverted signal is not super usefull unless you use the AC switches or you invert it back or add a offset of 1v.

My question is, does it make sense and is useful for you to have an inverted (-1v) signal? Or should I replace the attenuverter with a attenuator (just attenuate from 0v to 1v and not invert). I’m scratching my head on which use case would be more useful for most ppl. I think there are use cases for both but what the vidiots think?

Maybe the best solution is to add 1v to the inveted signal, so its always 1V regardless if its inverted or not?

I’m asking all this for the first time when I actually plugged it and started to use it on different parts of my system.


It might be handy to have the inverted signal available for summing with a positive voltage. I don’t see much downside to using an attenuverter.

1 Like

I’m def up for a kit or prebuilt, whichever. Ideally pre-built :slight_smile: Really excited to combine the Cortex and MP like this. Thanks for your hard work!

1 Like

I would be down with a prebuilt for sure!

@luix i just wanted to check in on your progress (mainly because I don’t want to miss out). I am definitely interested in a prebuilt module! Let us know when you are ready to take orders. This was a really great idea. Thanks!


Also in for prebuilt versions of both expanders when they’re available.

So I’ve been busy with another thing the last couple 2 weeks, but I think I will be able to finish the expander project in July. The current status is its a working version but with some noise, so I need to investigate whats the problem with the board.

This project wont get abandoned :slight_smile: , anyway @pbalj told me he wanted to design/build/sell(?) another version of the expander he is probably working on so we may have 2 flavor of this expander soon!


I’m still very interested in a prebuilt unit!
at the same time
I like flavors
I’m sure I’ll end up with a second visual cortex at some point that way I can do one of both :slight_smile:

Ha! I am in the same boat. I am definitely getting a second VC in the future.

Im down for a prebuilt.

I am keen to order a pcb/ panel if possible , thanks

I´m also interested in an prebuilt one!!
greetings from sunny Bielefeld/Germany

Any news on this ? @pbalj ? I am interested in diy PCBs / or built modules for an output expander for visual cortex

Every time I patch my system, I miss this module. Wish I could help in some way, but I know very little about circuit design.

@creatorlars this could be a good idea for a new cadet module (diy pcb /panel), I feel like if more VC users knew what this does, it could be really popular