[BUILD] MFOS Echo Rockit eurorack

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[BUILD] MFOS Echo Rockit eurorack

Post by synthcube » Wed Jan 18, 2017 6:33 pm

edit 5-11/2017:
available here: http://synthcube.com/cart/mfos-echo-rockit-euro
____________________________________________________________

With gratitude to clarke68 for the panel design and barcode for the panel pcb layout, we're happy to announce the MFOS Echo Rockit for eurorack.

Shortly, we'll be offering panels, panel+pcb sets, full kits and assembled units for the PT2399-based echo.

Pots, jacks and switches mount to the panel PCB- no wiring! We'll post the BOM, schematics etc shortly. The original MFOS through-hole PCB layout is utilized in combination with the barcode panel pcb.

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Last edited by synthcube on Thu May 11, 2017 9:02 am, edited 2 times in total.
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Post by hmurdoch » Sun Jan 22, 2017 2:19 pm

definitely interested in this! would love cv control over delay time though. Should be a fairly simple mod?

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Post by stringsthings » Mon Jan 23, 2017 9:30 am

Most excellent!

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Post by Devi » Thu May 11, 2017 9:38 am

hmurdoch wrote:definitely interested in this! would love cv control over delay time though. Should be a fairly simple mod?
:tu: :tu: :tu:

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Post by DozenCrows » Sun Jun 04, 2017 12:40 pm

Something for the kludge space?

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Post by kingspill » Thu Jun 29, 2017 4:14 pm

Very much looking forward to this.

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Post by euromorcego » Mon Oct 09, 2017 5:18 am

very interesting project! Just saw it now because it showed up in ModularGrid ;)

But does it work with modular levels? The original runs on a single 9V battery, right?

And the MFOS page says
MFOS wrote:Grounding issues will arise if the Echo Rockit is powered from one side of a dual supply system. The Echo Rockit's virtual ground will be at 1/2 of the positive supply which will make DC ground matching impossible. I think issues involving smoking ICs could arise if this advice is ignored. If you know of something I don't on this issue I'd be happy to hear it but I highly recommend the solution shown above in the "Powering an Echo Rockit from Your Dual Supply" illustration.

I see that the 78L05/79L05 has been included in the BOM. So I guess the suggested solution has been implemented (hard to see on the pcb). Does it work well in a modular context?

Any problem if the filter CV is like close to +12V or -12V?

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Post by synthcube » Mon Oct 09, 2017 8:34 am

yes, it was designed to incorporate the MFOS circuitry for use on +/-12V euro systems... we're biased of course but love the couple of them we have set up here.
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Post by euromorcego » Mon Oct 09, 2017 11:27 am

synthcube wrote:yes, it was designed to incorporate the MFOS circuitry for use on +/-12V euro systems...
ok, great!

Do you happen to know if there is any problem when the input exceeds the 10V (as I understand, with the modification the Rockit essentially runs on +/-5V, so it should have a bit less headroom than the "usual" eurorack). I just want to make sure I can use it in a system without any thinking.

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Post by synthcube » Mon Oct 09, 2017 1:22 pm

we have not seen any issue, no... thanks
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Post by southphillysynths » Thu Jan 04, 2018 7:16 pm

Just started building my kit!

Another wonderful kit by synthcube thanks so much! Looking forward to more MFOS in my rig.

How are the PCBS connected? should the component pcb connect with the pins to the hardware pcb through the X pads?
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Post by synthcube » Thu Jan 04, 2018 8:18 pm

correct--- the single pin pads on the main PCB (that are used for flying wire connections for the original panel) connect via pin headers and female sockets to the panel PCB-- enjoy!
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Post by southphillysynths » Tue Jan 23, 2018 12:24 am

synthcube wrote:correct--- the single pin pads on the main PCB (that are used for flying wire connections for the original panel) connect via pin headers and female sockets to the panel PCB-- enjoy!
worried about the orientation of the square headers, should I use circular machine headers for a better fit?

Also missing the nuts to secure the back of the standoffs from the kit!
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Post by synthcube » Tue Jan 23, 2018 9:57 am

we've had good reports from builders using the square ones, but no issue changing them-- and drop us an email we'll send the nuts!! Thanks!
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Post by euromorcego » Tue May 01, 2018 8:02 am

now also started building (from pcb/panel).

One question: which jacks are needed? Is it the PJ301BM (e.g. from thonk) and what is the orientation? The seem to fit only one way ... but not in the way indicated on the silkscreen.

AND: the switches are all on-on, correct?

Some other comments: the single pins are a major pain. Not sure if the panel is really that much of an advantage versus wiring (or a panel plus panel pcb that is the connected via wires to the main pcb).

The holes for the switches are quite tight and won't work with the (more common) switches that have a solder lug.

Otherwise all seems fine for now ...

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Post by j450nn014n » Sun May 27, 2018 7:57 am

I was just about to start building one today. I've been eyeing the box of parts for days longingly. :) As with the other 2 MFOS I've built, there was a lug on the pots that had to be cut off. Is that what you're referring to? If so, it's plier time.
euromorcego wrote:now also started building (from pcb/panel).
The holes for the switches are quite tight and won't work with the (more common) switches that have a solder lug.
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help!

Post by j450nn014n » Thu Jun 28, 2018 5:33 pm

I've worked through most of the confusions myself, with regards to the panel with the pots. I wish the resistors and caps were as clearly documented on this panel as they are on all other MFOS boards that I've put together. I can't actually see if the 78L05 voltage regulator slot is what it says. So blurry it could be 79L05, though i guessed.

My BIG QUESTION is about the instructions "mount all headers on this side" and Mount All headers first". What headers? Male or female. And what about the other pins. HOw is this supposed to go together? on other MFOS devices I just used hookup wire. Ok, should i put the female headers in x1-x28? And also ground and also BN & BP.

Instructions would really help, but I seem to have some of it figured out. Any thoughts? THanks in advance.
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Post by synthcube » Fri Jun 29, 2018 5:47 am

the single pin headers can be installed either way-- female on one board, male on the other-- just make sure you use the same 'gender' on one pcb- no mixing and matching!
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Post by j450nn014n » Fri Jun 29, 2018 6:16 am

synthcube wrote:the single pin headers can be installed either way-- female on one board, male on the other-- just make sure you use the same 'gender' on one pcb- no mixing and matching!
Yes, I get that.I have designed my own boards. I was perhaps being a big oblique. I'll be less so.

How come there are no instructions with this board? The thing I liked about Ray's work was the amazing and often hilarious instructions. There were pretty good instructions with the pre-eurorack version, but nothing here.

I have no trouble just guessing and using common sense, but that does mitigate the joy of MFOS, don't you think?
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Post by synthcube » Fri Jun 29, 2018 7:49 am

fair point and good feedback-- our goal is to create full documentation-- it is however a work in progress :)
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Post by j450nn014n » Fri Jun 29, 2018 7:54 am

Let your fans do it... if you had a little wiki somewhere, people would just write all the bits they figured out and you could just package it up. I know I'd help just for fun.

I still don't understand why I'm soldering on pin headers though. Is there something I don't understand as to why I'd do this and not just solder it all together like on my noise toaster and WSG? Serious question. I'm not that experienced, and I'm worried that there's something I don't understand about why one way is better than another.
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GOT IT.

Post by j450nn014n » Fri Jun 29, 2018 5:06 pm

The single pin headers directly join the two boards together. That's craziness. I doubt I'll ever get all the pins aligned, but that's another issue.

My big question is why are C6 & 2xPWR caps diagramed as polarized, yet they're non-polarized caps? This scares and confuses me. Am I doing something wrong?
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Post by synthcube » Sat Jun 30, 2018 10:51 am

the euro version is set up so that the original pcb can be used, along with the new panel pcb for direct soldering of pots, jacks, switches etc. The single pin headers are a compromise to Ray's original PCB design and layout...

C6 is one of the non-polarized electrolytic caps. The 2XPWR caps are tantalum caps, which are polarized-- they have a small '+' sign to show polarity
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Final question

Post by j450nn014n » Sat Jun 30, 2018 1:50 pm

Right. Sorry. I was working from memory the 2xpwr were obvious. But why on the circuit board is C6 shown as polarized with a circle with a + next to it. Scares us noobs.

FINAL question: how can I orient the power and connect the ribbon and get around the pins x4, 5, 6, 20? See below. I'm so close to done, and not quite sure if I did it right. Thanks!


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Post by synthcube » Sat Jun 30, 2018 2:04 pm

check the orientation of that power header- its supposed to be able to allow the cable to connect outside the boundary of the pcb sandwich
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