Video experimentation board project

I was laying out a PCB for some video experiments.
While doing this I thought it might be interesting for others, too.
I am not a big fan of solderless breadboards, so this pcb is aimed to use the layout of the breadboard while soldering the parts.
The idea is that you an solder a prototype and connect it easily to the headers with wires or jumpercables, while the common building blocks are pre-made. (see below)
The voltage sources are placed near the rails of the ‘breadboard’ , so you can connect +12v or +5v to them. The GND rails are pre-connected.

Note that the values of most components are not yet correct and the features are not yet set in stone. Early stage design!
I want to be able to do CMOS / lunetta style video experiments, LZX type format, and possible standalone composite video stuff.
Most features are based on the Cadet and Castle schematics.

Current features:
2x input buffer
2x output buffer
2x comparator
2x jack aux
2x potmeters

2x Pinheaders for all function connections. (I’ll add a legenda somewhere)
The power pinheader has : +12v, +5v, +1v, +0.5v, -12v
Header access to the jacks and jack switches

I want to make the opamp configurations in such way that they can be multi functional, let’s say as buffers, comparators of amplifiers. I still have to find a good method for this.
But this will make the board more open-ended.

I might add composite video, @BastienL has given me some tips about this already.

The aim is to make several versions of the boards:
a medium sized board (like the picture above)
a big board - more protospace and features
an eurorack pcb&panel for more permanent prototypes

If any of you have tips / hints / feature requests, please tell me!
I want to make this board as useful as possible, for everybody!

The project is also posted here, as a discussion.


I’ll be adding composite inputs too. need to find the right footprint (vertical RCA)

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i use these RCJ-024 quite a lot. can even get a whole bunch cheap from ali if you prepared to wait

update. almost done I think

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The pcbs just came in :smile_cat:
so I’ll test them soon. then offer them online.
one thing I forgot is the middle rail marking. but that is no unworkable.

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First test = OK. voltages are all correct. pots, jacks and header connections work.

next up: …an experiment!


would love to get my hands on some of these for phase space activities!!!

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When all the tests are done, I’ll make them available to all :slight_smile:


second test ok.
I’ll offer the old pcbs for cheap

I have made a new layout . markings are updated
new stuff:

  • breadboard area now has clear markings (on the top and bottom side of the pcb)
  • pot, switch and jack markings are more clear
  • power out markings are better
  • ext PSU has gnd label
  • connected header pads have lines

the new ones will be ordered soon

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see the order thread here:

first project on the VEB:
It is a bit of getting used to it, but it works pretty fast and is easily tested in your system!
hint: new modules coming up soon!