[SOLD OUT] Eurorack Panels for the Miss 10 VCO & VCF/A

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negativspace
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[SOLD OUT] Eurorack Panels for the Miss 10 VCO & VCF/A

Post by negativspace »

With Mike's blessing I have designed a couple of Eurorack panels for the E.A.S. Miss 10.
The designs require some modifications to the PCBs, but it's well worth doing and
none of it is too hard.

I've used the 'usual' Davies 1900H-clone knobs for the small positions, and Davies
1913BW
for the big ones. The two knobs have roughly-matching knurl designs
and are the same height - so they really work well together.
_____________________________________________________________

As of 11/18 quotes are in and the prices are now set. Shipping within North
America is included in the price for any number of panels purchased, if you're
overseas please add $5 per order to cover the additional paypal &
shipping costs. My paypal address is jcoates42 (at) gmail (dot) com.


Prices

VCF/A: SOLD OUT
VCO: SOLD OUT



Order List (blue indicates paid, red indicated shipped)

ringstone - VCO [x4] VCF [x4]
theabsent - VCO [x2] VCF [x4]
mikecameron - VCO [x1] VCF [x1]
PF - VCO [x1] VCF [x1]
Tall Midget - VCO [x4] VCF [x4]
mamonu - VCO [x2]
trainspotter - VCO [x4] VCF [x4]
E.A.S. - VCO [x2] VCF [x2]
glacial23 - VCO [x1] VCF [x1]
wavehead - VCF [x1]
keninverse - VCO [x4] VCF [x4]
iopop - VCO [x1] VCF [x1]
janvanvolt - VCO [x2] VCF [x1]
computer controlled - VCF [x2]
simfonik - VCO [x1] VCF [x1]
frozenkore - VCO [x1] VCF [x1]
nangu - VCO [x5] VCF [x8]
perplx - VCO [x2] VCF [x2]
gwaidan - VCO [x1] VCF [x1]
nihilist - VCO [x1] VCF [x1]
samuraipizzacat29 - VCO [x1] VCF [x1]
Last edited by negativspace on Thu May 03, 2012 12:13 pm, edited 77 times in total.
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negativspace
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Post by negativspace »

VCF/VCA - 12hp

Image Image

The jack labelled 'dir' is a direct, pre-VCA output from the VCF section. The
'out' jack is post-VCA. Gain and Mod are VCA CV inputs - 'Gain' is an initial
gain control and should ideally have +5v normalled to the jack - but this is
not necessary. (Simply patch a +5v source to the jack.)

To wire the 'dir' jack, I replaced R88 (3.3k) with 2 resistors - a 680R and a
2.7k (total 3.38k). The 680R is stuffed into the VCF-side pad and a wire runs
from there to the tip lug of the jack. The switch lug runs back to the PCB,
where the 2.7k resistor is stuffed into the VCA-side pad. So when you use
the 'dir' output you have some protection on the op-amp, and when you
don't you have the original circuit, basicallly unchanged. It works very well.
The VCA does add a lot of color, so for recreating the MS-20 filter section
by chaining two of these together it is a nice thing to have.
Last edited by negativspace on Tue Dec 06, 2011 3:14 pm, edited 7 times in total.
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Post by negativspace »

VCO - 8hp

Image Image

The panel image reflects the final layout, the photograph is the first completed
prototype to which some changes were made. :oops:

The first modification here is that the waveform switch is omitted and each
waveform is brought out to its own jack. Simply run wires from each pad to
the individual jacks instead of a selector switch.

The second modification is to separate the PWM and Pulse width controls
from one another. This is a little more involved. First, ground both pots on
their CCW lug, and ground the PWM input jack's switch lug as well. Tie this all
to your daisy-chained panel controls' ground. Next, connect a 220k resistor
from the square ground pad @ VR11 straight over to the leg of R83 closest
to the 4558. Now, assuming the square pad is pad #1, connect pad #2 to
the wiper of your PWM pot (B1M). Connect the CW lug to the TIP of the
PWM jack. That control is finished.

Next you will need to tie the wiper of the WIDTH pot (B1M) to the junction we
created earlier between R83 and the 220k to ground. Do this with a 100k
resistor in series. Connect the CW lug of the WIDTH pot to pin 4 @ VR11.
Now your WIDTH control is finished. :tu:

The purpose of the 220k resistor is to limit the range of the WIDTH control
so that it does not fully cut out at max CW. The purpose to splitting up the
PWM and PWM, of course, is to allow you to control both PW offset and
modulation depth. As described, the WIDTH control range is from roughly
50-50 at full CCW to ~95% at full CW.

The 4-position rotary switch that I used for the octave selector is an
Alpha part from Mouser - LINK HERE.
Last edited by negativspace on Wed Dec 07, 2011 4:59 pm, edited 10 times in total.
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roman_f
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Post by roman_f »

negativspace wrote:'Gain' is an initial gain control and should ideally have +5v normalled to the jack - but this is not necessary. (Simply patch a +5v source to the jack.)
could you tell more about this?
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Post by negativspace »

Mike designed the PCBs very faithfully to the MS10. On the original, there is a +5v signal applied to the 'Initial Gain' jack so that the knob can be used as a volume offset.

That 5v source is not present in this re-creation, however. The easiest way to get it is to patch the GAIN jack with a +5v signal from a module that generates DC offsets. If you want to get fancy, build a +5v source on perfboard, attach it behind the panel, and wire it to the switching lug of the GAIN jack.
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ringstone
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Post by ringstone »

Thanks for designing the panels, you are going to save me a lot of work! They look great too... :hihi: I will take 4 of each...

Cheers
Blair
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Post by roman_f »

would +5V from my dotcom power work?
http://synthesizers.com/technical.html#internaldc

which lug is switching?

thank you!
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Post by rockmanrock »

The circuit diagrams for these specify 15V, I assume with a few parts changes they'll run on 12V?
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Post by roman_f »

that's my version of 2U dotcom panel

Image
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PF
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Post by PF »

Uhhhhh, They look :hail: :hail: ......
I think i have to call Mike for some more pcb's... :deadbanana:
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Post by roman_f »

Image

that one should be better
sorry for spamming your eurorack branch, maybe you could rename it to just miss-10 panel layouts, for any format
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negativspace
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Post by negativspace »

roman_f wrote: sorry for spamming your eurorack branch, maybe you could rename it to just miss-10 panel layouts, for any format
Actually, this is supposed to be a thread for people to discuss and order the Eurorack panels - maybe you should start your own thread if you want to show off the 5U panels. (Which are nice, but really don't belong here.)
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Post by mikecameron »

These panels look great! I'm in for one of each depending on pricing.
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Post by theabsent »

I would need 8 so depends heavily on pricing.
My releases: https://laitoshuoltaja.bandcamp.com/releases
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Modular live gigs (our modular band): https://konekonekone.bandcamp.com/releases
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Post by negativspace »

Well, along with the # I need for myself we are already up near 20 - which is the point where it becomes cost-effective. I'd say ~$20-25 for the VCF and $15-20 for the VCO. Further interest will only sweeten the deal...

I do still need to make sure the circuits work well on 12v and I need to devise a PCB mounting scheme, but that's why I ordered the prototype panel. :hihi:
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Post by PF »

Jason i think you can put one vco panel on my account....
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Post by ringstone »

negativspace wrote:I need to devise a PCB mounting scheme
I was thinking of using a home-made stooge-style bracket...

Cheers
Blair
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Post by negativspace »

I cut my own from stock aluminum, but I'd like to see if I can add a standoff option for a more universal appeal. Save everyone some trouble...

Also, I've tested out a 3-position version of the 4-position switch in the VCO - I think it's going to work.
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Post by Tall Midget »

Do the Miss 10 pcbs work fine on 12 volts without any modification? Anyway if so i'd be down for 4 of each panel.
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Post by negativspace »

I updated the VCO page, and the prototype VCF/VCA panel from FPE is here. It looks really sharp! I'll try to get it wired up and test this on 12v by the weekend. :tu:
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Post by negativspace »

Good news! :party:

I finished wiring up the VCF/VCA panel tonight, and it tests out 100% on 12v. The resonance is sufficient for self-oscillation and everything functions as expected. It sounds holy-freaking-crap-good... I'm finding a lot of familiar timbres in this thing. I've moved a couple of things around in the layout now that I have the real thing in hand - nothing major, just some spacing tweaks around the big knob.

The VCO is next, and I'll get the panel ordered in the next couple of days. The backordered switch is due to be in stock roughly 2 weeks from now, it kinda all depends on that.

Image
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Post by theabsent »

Looks really good. I hope I can afford some of these.
My releases: https://laitoshuoltaja.bandcamp.com/releases
My sound art & live gigs: https://www.facebook.com/Laitoshuoltaja/
Modular live gigs (our modular band): https://konekonekone.bandcamp.com/releases
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Post by Ankh »

Looking really good, you should team up and offer these modules pre-built!
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iopop
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Post by iopop »

Really nice. Makes me want to make euro stuff! Do I really need to add another format to my backlog?! :help:

Any chance that the rest of the miss ten would be possible to add in 12 HP ? LFO, ADSR and S&H? That would add up to the 32hp beauty case size.
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Post by negativspace »

Thanks, guys. I was up past 7 am playing with this thing. I love it. Thanks, Mike! :hail:

It's absolutely possible to pack the rest into 12hp. It's a total of 7 knobs and ~5-6 jacks? That's fewer than the VCF/A. I'll see what the status of those boards is... it would be sweet to have all of them available.

I'm going to submit the artwork for a quote from MPC on Monday, but I think we're talking ~$15-20/ea based on the interest so far.
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