LZX format video Experiment board

Ha! I’m working on making one of my V1’s into a breadboard too! Great minds think alike.

I’ll have to place a V2 order with the Snow module when both are available…

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That’s an excellent idea! You guys are clever.

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That’s awesome @rempesm :+1:t3:
Are most or all of the passives the same as in the BOM? Now that I ask, I don’t remember seeing one but surely there is.
Did you have to do any major customising to make this work?
@joem, have you or are you planing any useful mods to create your version of this fixed breadboard setup? Just curious but I’m really tempted to try this too.

@reverselandfill, is it possible to power the experimental board from an external PSU? Like a standard 15V AC from Doepfer for example.

the build files are here:

The BOM is included in the buildguide, because you can build it in several ways.

you can power the VEB with a dual (eurorack or bench supply) PSU. -12 and +12
I added an external power input (left next to the 16pin header)
You cannot power it with an AC brick. This board needs DC.
If you don’t have such a powersupply, you can also use 2x 9v batteries.
(PM me if you need assistance)

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Cheers @reverselandfill for the link & info :+1:t3:
DC PSUs are definitely easier to source so I’m glad to see that. Is the power socket footprint on the PCB a particular standard? Ah, I’ll have a look in the build instructions & update this if the answer is there.

Update: there’s a nice closeup of the power input feet in the build guide but I’m not familiar with this type of power connector :grimacing:

A small suggestion would be to turn the 3x2 footprint of POTH1 90 degrees to match the layout of the pot. POTH2 is perfect although to the side of course.

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What are the values of the 3x pots? Surely B10K.

IMG_20201219_232453

No, I’m planning on doing pretty much the same thing as @rempesm – I’m just waiting for my female headers to arrive. Didn’t have enough for this kind of thing already on hand when I started.

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The pots can be whatever value you need for your circuit. Chances are if you’re building some Cadet/Castle circuits that you’ll want B10K since that’s what most (all?) of those use, but it’s entirely up to you.

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in v2 of the VEB the pot & switch headers are better aligned. (and better labeled)

I mainly use 10k pots.

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Just double checking my work on these DIP adaptor boards for ADA4851-4s with the buffer circuit on LZX’s Github. The VEB makes tasks like this feel less annoying to start. Thanks again @reverselandfill

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I see this Polarised cap between opamps non inverting input and gnd in the unity gain amplifiers for +1v and 0.5v.
What are they there for? Is it extra noise protection? Or do they stabilize the opamp in some way…?

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It acts as a First-Order low pass filter.

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Are these boards still being made?

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yes, I have them in stock (v2 with better graphic overlay)
Thonk also has them

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Nice! Yea I checked with Thonk and it looked like they were sold out which is why I was askin. Will definitely have to snag one!

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you can buy one (or a pack) directly from me (with some forum discount)

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