[IN STOCK] Eurorack: Discrete State-Variable VCF v1.4

From circuitbending to homebrew stompboxes & synths, keep the DIY spirit alive!

Moderators: Kent, Joe., analogdigital, infradead, lisa, parasitk, plord, sduck

Post Reply
User avatar
M-Circus
Wiggling with Experience
Posts: 413
Joined: Tue Jun 19, 2012 3:32 pm
Location: Oslo Baby!

Post by M-Circus » Thu Apr 17, 2014 11:04 am

Don't even own a case at the moment, but what the hell:

One set of PCBs and panel for me, pretty please.

User avatar
sgnelson
Wiggling with Experience
Posts: 284
Joined: Sat Jan 30, 2010 1:22 pm
Location: Charlotte, NC

Post by sgnelson » Thu Apr 17, 2014 11:11 am

I'll take 1 set of PCB's and a Panel please.

User avatar
Mindarp
Common Wiggler
Posts: 132
Joined: Mon Apr 01, 2013 4:21 pm
Location: Perth, Ontario

Post by Mindarp » Thu Apr 17, 2014 11:22 am

I would like 2 complete sets please, including panels. Cheers very much.
Belief is the death of reason.

User avatar
Stinktier86
Ultra Wiggler
Posts: 758
Joined: Sun Aug 26, 2012 2:47 pm

Post by Stinktier86 » Thu Apr 17, 2014 11:39 am

what is the estimate bom sum price? just checking whether to go nuts or not. :love:

User avatar
ablearcher
Veteran Wiggler
Posts: 604
Joined: Thu Dec 26, 2013 8:00 pm
Location: Portland
Contact:

Post by ablearcher » Thu Apr 17, 2014 12:06 pm

1 set (panel + pcb) here please!

hsimonis
Learning to Wiggle
Posts: 34
Joined: Sat Mar 23, 2013 7:12 pm
Location: Ireland

Post by hsimonis » Thu Apr 17, 2014 2:48 pm

Two complete sets (PCBs plus panels) please!

Thanks

User avatar
KNYST
hiding in the forest
Posts: 2913
Joined: Mon Jan 26, 2009 10:09 am
Location: the Taiga, Sweden

Post by KNYST » Thu Apr 17, 2014 4:41 pm

YES! :party:

2x PCB sets + panels

[edited/updated amount]
Last edited by KNYST on Fri Apr 18, 2014 5:41 am, edited 1 time in total.
NOISE HEALS.
patch responsibly.
LISTEN | WATCH

User avatar
sicpaul
Wiggling with Experience
Posts: 337
Joined: Thu Dec 22, 2011 9:28 am
Location: Berlin

Post by sicpaul » Thu Apr 17, 2014 6:10 pm

2 PCB sets please (no panel)

User avatar
negativspace
Manhattan Analog
Posts: 6568
Joined: Tue Apr 13, 2010 2:50 am
Location: Manhattan, KS, USA
Contact:

Post by negativspace » Thu Apr 17, 2014 6:29 pm

Holycrapsixpages... I'll work on compiling the orderlist tonight so I don't get too far behind. :eek:

Those of you not interested in a panel, please be aware that this thing is not a multi-format PCB like I usually offer. It's made to integrate with the Euro panel and one of the PCBs has no other purpose than to hold the panel controls. So you'll only need the one board if you're working in a non-Euro format. (Bonus for you.)

If you want a control board with which to do your own panel using the same control layout I'll send you a blank FPE file with only the hole locations so you can roll your own. :tu:

You can still build it in other formats, there are mounting holes for standoffs, but you'll need to solve the power on your own (Euro header only) and you'll also have to wire it up using the pads for the inter-board headers. It's not a big deal, it'll work perfectly, but I wanted you all to know what's what. Those pads are not marked on the PCB but I'll trace 'em out and make a JPG for this thread once the final layout is verified.

User avatar
negativspace
Manhattan Analog
Posts: 6568
Joined: Tue Apr 13, 2010 2:50 am
Location: Manhattan, KS, USA
Contact:

Post by negativspace » Thu Apr 17, 2014 6:39 pm

latigid on wrote:What are the hard-to-get components?
There are none. It's all discrete. I couldn't justify $6 for 4 transistors - x4 per board - when 2N390x at $0.02/ea work and sound just as nice. As far as matching goes, I've built them with matched and unmatched transistors and couldn't really tell any difference. I recommend loosely matching them as a matter of best practice but it's not something you should worry about. (And certainly not something worth spending an extra $23 per module on.)

I even found that I liked it better with TL072s as the output buffers vs. expensive audio opamps, so I wouldn't even recommend reaching on those.

The only "specal" parts I use are the styrene timing caps (Mouser) and the particular transistors I prefer. (PN100/PN5138) The design works well with 2N390x as I said above, though, and should work with any general-purpose small signal transistors. The PCB has the pinouts marked for all transistors (EBC) so substituting your own, no matter the pinout, should be straightforward.

User avatar
negativspace
Manhattan Analog
Posts: 6568
Joined: Tue Apr 13, 2010 2:50 am
Location: Manhattan, KS, USA
Contact:

Post by negativspace » Thu Apr 17, 2014 6:41 pm

sduck wrote: Now this is my kind of BOM!
Talk about something for nothing... :hihi:

I'm hesitant to post the final BOM as I still have a tweak or two to make to the design. Once it's nailed down I'll post it. (It's probably not going to change from where it is now, I'm just being pedantic. There's only a resistor value or two left to play with.)

User avatar
magneticstripper
Common Wiggler
Posts: 86
Joined: Sun Aug 30, 2009 12:15 pm

Post by magneticstripper » Thu Apr 17, 2014 7:22 pm

I would love 1 full set please

User avatar
Phetus
Wiggling with Experience
Posts: 292
Joined: Mon Mar 04, 2013 4:33 pm
Location: Berlin

Post by Phetus » Thu Apr 17, 2014 9:33 pm

:goo: :sb: :goo: :sb: :goo:
I ffull set for me please!!! How do I add myself to the list?

User avatar
Phetus
Wiggling with Experience
Posts: 292
Joined: Mon Mar 04, 2013 4:33 pm
Location: Berlin

Post by Phetus » Thu Apr 17, 2014 9:35 pm

is this actually the paypal address? xxxxxxxx@gmail.com

User avatar
Cat-A-Tonic
Lobsters love Muff
Posts: 3694
Joined: Mon Feb 04, 2008 12:03 am
Location: Yokohama, Japan

Post by Cat-A-Tonic » Fri Apr 18, 2014 1:39 am

The demo sounds fantastic!

I don't really feel like I need more filters in my backlog at the moment, but... you make it hard to resist.

Nice job. :tu:

nigel
Veteran Wiggler
Posts: 603
Joined: Wed Jan 16, 2013 6:49 am
Location: Melbourne, Australia

Post by nigel » Fri Apr 18, 2014 1:39 am

This one has been on my list for a while. 1 panel + PCB set.

User avatar
Rigo
Super Deluxe Wiggler
Posts: 2335
Joined: Mon Dec 27, 2010 4:48 am
Location: Belgium

Post by Rigo » Fri Apr 18, 2014 1:52 am

Phetus wrote::goo: :sb: :goo: :sb: :goo:
I ffull set for me please!!! How do I add myself to the list?
You just did ...
Phetus wrote:is this actually the paypal address? xxxxxxxx@gmail.com
No ... since the exact price isn't known yet there is no need for putting the correct address. Though you could easily find it out by looking at any of the other order threads from Negativspace :hihi:

User avatar
latigid on
Ultra Wiggler
Posts: 892
Joined: Fri Oct 25, 2013 11:05 am

Post by latigid on » Fri Apr 18, 2014 5:43 am

negativspace wrote:
latigid on wrote:What are the hard-to-get components?
There are none. It's all discrete. I couldn't justify $6 for 4 transistors - x4 per board - when 2N390x at $0.02/ea work and sound just as nice. As far as matching goes, I've built them with matched and unmatched transistors and couldn't really tell any difference. I recommend loosely matching them as a matter of best practice but it's not something you should worry about. (And certainly not something worth spending an extra $23 per module on.)

I even found that I liked it better with TL072s as the output buffers vs. expensive audio opamps, so I wouldn't even recommend reaching on those.

The only "specal" parts I use are the styrene timing caps (Mouser) and the particular transistors I prefer. (PN100/PN5138) The design works well with 2N390x as I said above, though, and should work with any general-purpose small signal transistors. The PCB has the pinouts marked for all transistors (EBC) so substituting your own, no matter the pinout, should be straightforward.
Cool, 2x 1 nF polystyrenes? I'm contemplating an order from musikding.

User avatar
nikmis
my last name backwards
Posts: 799
Joined: Sat Sep 04, 2010 6:40 am

Post by nikmis » Fri Apr 18, 2014 7:19 am

negativspace wrote: Those of you not interested in a panel, please be aware that this thing is not a multi-format PCB like I usually offer. It's made to integrate with the Euro panel and one of the PCBs has no other purpose than to hold the panel controls. So you'll only need the one board if you're working in a non-Euro format. (Bonus for you.)
Thanks! so two of those main circuit PCBs for me

User avatar
windspirit
Super Deluxe Wiggler
Posts: 3002
Joined: Thu Sep 20, 2012 11:43 pm
Location: krellifornia

Post by windspirit » Fri Apr 18, 2014 7:36 am

im in for a full set. this thing sounds really smooth

4285407da1d2a63820a3007c1
Common Wiggler
Posts: 102
Joined: Mon Feb 27, 2012 6:32 am
Location: London, UK

Post by 4285407da1d2a63820a3007c1 » Fri Apr 18, 2014 7:46 am

One full set for me, sounds great!

User avatar
Delta T
Common Wiggler
Posts: 146
Joined: Fri Oct 15, 2010 4:34 pm
Location: New Jersey

Post by Delta T » Fri Apr 18, 2014 8:13 am

I'll take two complete PCB sets (no front panels) and when you have a chance I would like a copy of the FPE layout as well.

Thank you so much for doing this!

User avatar
Stinktier86
Ultra Wiggler
Posts: 758
Joined: Sun Aug 26, 2012 2:47 pm

Post by Stinktier86 » Fri Apr 18, 2014 8:15 am

negativspace, regarding what you wrote in this thread viewtopic.php?t=110487

and since the CP3 circuit is essentialy the same - would i be able to add a couple of more channel ins to this one too, and thereby hit two birds with a rock?

bonus question: would i be able to tap the mixed signal, pre-filter, to a separate extra output jack?

User avatar
Skaput
Common Wiggler
Posts: 236
Joined: Sun Jan 13, 2013 2:35 pm
Location: Uk

Post by Skaput » Fri Apr 18, 2014 10:44 am

:party: iam not missing this party, 1 set for me please

User avatar
duff
Veteran Wiggler
Posts: 747
Joined: Sun Mar 10, 2013 2:21 pm
Location: UK

Post by duff » Fri Apr 18, 2014 11:11 am

I'm interested in a full set, and possibly some single boards as well.

Post Reply

Return to “Music Tech DIY”