| Author |
Message |
peng
Joined: Feb 23, 2006
Posts: 111
Location: Chicago
Audio files: 2
|
 Posted: Thu Nov 20, 2008 3:16 pm Post subject:
Delta VCF pcbs |
  |
|
The core is nearly the same as the original but the surrounding circuitry is different. It can sound like the original and SO much more.
Here's a link to the module page:
http://www.megaohmaudio.com/deltaVCF.html
Thanks,
p.
Here are the schematics and BOM. Tell me if there any mistakes/inconsistencies.
At the moment I am no longer selling these pcbs.
The attached is for the benefit of those who already bought/have these.
| Description: |
|
Download (listen) |
| Filename: |
Delta VCF v2 SDIY BOM.pdf |
| Filesize: |
7.77 KB |
| Downloaded: |
169 Time(s) |
| Description: |
|
Download (listen) |
| Filename: |
Delta VCF Ver2SDIY.pdf |
| Filesize: |
37.17 KB |
| Downloaded: |
232 Time(s) |
Last edited by peng on Tue Jan 25, 2011 9:29 pm; edited 1 time in total |
|
|
Back to top
|
|
 |
peng
Joined: Feb 23, 2006
Posts: 111
Location: Chicago
Audio files: 2
|
|
|
Back to top
|
|
|
fluxmonkey
Joined: Jun 24, 2005
Posts: 708
Location: cleve
|
| Posted: Thu Nov 20, 2008 8:41 pm Post subject:
|
|
|
i'm in for one. thx!
bbob
_________________
www.fluxmonkey.com |
|
|
Back to top
|
|
|
fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
|
| Posted: Fri Nov 21, 2008 12:46 am Post subject:
|
|
|
hey peng,
can't see anything on your site, just the navbar to the left (IE6, WinXP), neither at home, nor at work.
_________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
|
|
Back to top
|
|
|
peng
Joined: Feb 23, 2006
Posts: 111
Location: Chicago
Audio files: 2
|
| Posted: Fri Nov 21, 2008 1:20 am Post subject:
|
|
|
| fonik wrote: | hey peng,
can't see anything on your site, just the navbar to the left (IE6, WinXP), neither at home, nor at work. |
Yes. this is a known problem. My ladyfriend who built the site hasn't figured out how to fix it yet. With Firefox and IE above 6 it should be good.
We're stumped so any suggestions are welcome. |
|
|
Back to top
|
|
|
fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
|
| Posted: Fri Nov 21, 2008 1:31 am Post subject:
|
|
|
don't have any clue about the site.
anyways, how much will the PCB be? what is the current source like? i wanted to ask just because i have coincidently already designed a PCB myself last month, but not etched yet. it uses a simple 1V/oct current source utilizing common unmatched transistors.
_________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
|
|
Back to top
|
|
|
andrewF
Joined: Dec 29, 2006
Posts: 1176
Location: australia
Audio files: 4
|
| Posted: Fri Nov 21, 2008 1:35 am Post subject:
|
|
|
worx for me - mozilla
nice one Peng |
|
|
Back to top
|
|
|
peng
Joined: Feb 23, 2006
Posts: 111
Location: Chicago
Audio files: 2
|
| Posted: Fri Nov 21, 2008 2:50 am Post subject:
|
|
|
| fonik wrote: | don't have any clue about the site.
anyways, how much will the PCB be? what is the current source like? i wanted to ask just because i have coincidently already designed a PCB myself last month, but not etched yet. it uses a simple 1V/oct current source utilizing common unmatched transistors. |
I'm don't know the price yet. I'm making the pcb a little more DIY friendly and correcting some silkscreen errors.
The current source is is a typical op amp summer to the base of a matched PNP pair. The pcb is made for a discrete matched pair or 8 pin DIP (SSM2220, etc.).
There is also an op amp biasing the tied emitters, much like a VCO current source.
Input has gain so you can distort things a bit if you want. The modules I'm making only have one input but the pcb will accommodate three.
Cutoff control will go down to completely off.
FM 1 is bipolar
FM 2 is switchable between EXP or AC coupled linear modulation (if you use a three position switch, C&K7211, it could be EXP, LIN, or AC LIN).
The original synth has the resonance trimmed to just below oscillation. My modules can go past that into oscillation. When oscillating the levels jump up quite a bit (approx. double). It's kind of nasty (in a nice way). There is a trimmer to set max resonance level so if you want a faithful clone you can trim it so it won't oscillate.
The VCA circuit can be completely independent of the VCF. The circuit is based almost entirely on a Mike Simms EDN article. It uses both sides of a LM13700. A huge improvement over the standard 3080 / 13700 VCAs.
Try it out if you haven't already.
There is some normalling which can be left out...but it's one of the best things about this VCF!
VCF out -> VCA IN
VCA out -> FM 2 IN
odd warpings, pitchshift like sounds, subtle bends, sheer chaos and noise.
Lot's of fun.
Try it with want you got.
p. |
|
|
Back to top
|
|
|
fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
|
| Posted: Fri Nov 21, 2008 11:55 am Post subject:
|
|
|
great features, peng. well done! 
it's obvious much more than a simple korg delta filter clone.
_________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
|
|
Back to top
|
|
|
vtl5c3
Joined: Sep 08, 2006
Posts: 425
Location: PDX
Audio files: 13
|
| Posted: Fri Nov 21, 2008 9:54 pm Post subject:
|
|
|
2 for me. I can haz, plz?  |
|
|
Back to top
|
|
|
johans121
Joined: Jun 19, 2007
Posts: 178
Location: Huntsville, AL (USA)
|
| Posted: Sat Nov 22, 2008 12:23 am Post subject:
|
|
|
I'll get a couple.
_________________
Don't feed me Indian, you WILL regret it!
-Jim |
|
|
Back to top
|
|
|
machine.cuisine
Joined: Jul 20, 2007
Posts: 61
Location: ks
Audio files: 4
|
| Posted: Sat Nov 22, 2008 10:56 am Post subject:
|
|
|
| I would be happy to buy one PCB. Thanks. |
|
|
Back to top
|
|
|
Funky40
Joined: Sep 24, 2005
Posts: 875
Location: Swiss
Audio files: 1
G2 patch files: 5
|
| Posted: Sat Nov 22, 2008 3:51 pm Post subject:
|
|
|
the Demos sound good !
I take one, depending on price and time maybe two. ( January would be cool, or later )
oh, if you anyway change the boards:
please make a third CV input .
Two with inverting would be fine but one is finally allready nice .
And it would be fine to have own pads for the Inverter, this way one is free how to use the inverter
= polarised Pot, or inverting with a switch ( what i prefer and do )
But it's not that important
thanks for this offer ! |
|
|
Back to top
|
|
|
janvanvolt
Joined: Nov 24, 2005
Posts: 285
Location: Mainz, Germany
|
|
|
Back to top
|
|
|
peng
Joined: Feb 23, 2006
Posts: 111
Location: Chicago
Audio files: 2
|
| Posted: Sat Nov 22, 2008 7:09 pm Post subject:
|
|
|
| Funky40 wrote: |
oh, if you anyway change the boards:
please make a third CV input . |
There is a third one. Forgot to list it here:
FM 1 bipolar (easy to use a switch if you prefer)
FM 2 with attenuator
1V/Oct input. Does not track perfectly. It's not temp compensated but the expo pair are matched. It wasn't one of the design goals to make it track perfectly. It tracks well enough for me but I wouldn't expect it to track your VCOs perfectly. I'll try to make an alternative tempco resistor footprint. That way you can experiment with temperature compensation if one wants or not worry about.
FM 1 and FM 2 expect 5V CVs, but can deal with anything within the rails.
| Funky40 wrote: | | thanks for this offer ! |
Thanks all for the interest. I'm trying to get everything together so I can place an order next week. Won't arrive until Xmas or just after. If all goes well, then January is the likely month I can ship these out.
p. |
|
|
Back to top
|
|
|
newdendrite
Joined: Nov 24, 2007
Posts: 25
Location: atlanta, ga
|
| Posted: Sat Nov 22, 2008 7:11 pm Post subject:
|
|
|
I'm interested in two boards!
Thanks,
Michael |
|
|
Back to top
|
|
|
TekniK
Joined: Aug 10, 2008
Posts: 1059
|
| Posted: Tue Nov 25, 2008 3:34 am Post subject:
|
|
|
| Hi,am interested in 1 pcb |
|
|
Back to top
|
|
|
peng
Joined: Feb 23, 2006
Posts: 111
Location: Chicago
Audio files: 2
|
| Posted: Sun Mar 08, 2009 7:18 am Post subject:
Delta VCF pcbs |
|
|
It has a been months since I planned to do the Delta VCF run. I was delayed (let's leave it at that!).
Here's the update.
I placed an order for ten. This is the prototype run. If it checks out OK then I'll order more. I'm estimating that there are 20 or so people who have been wanting/waiting for this pcb. I'll probably order 50 to start with unless more people express their interest.
Here is the run down followed by some attachments:
PCB is 3.5" X 5"
2 oz. copper
Lead free HASL
The traces and pads are large to withstand multiple reworkings. Silk screen has text for pots indicating pin 1 (typically connected to ground in the standard input attenuator configuration) and other useful hookup info such as name and pin function for some. Jacks and trimmers are also named.
2 pin MTA.100 header for CV normalling schemes
Double footprints for filter core caps (use 5mm Wima or the clear foil polystyrene), single turn trimmer (Bourns or Vishay (Vishay is half the price)), and power supply header (4pin MTA156 or 6pin MTA100). There is also an extra 4pin MTA156 header at a different angle for frac rack builders.
I still have to clean up the schematics and write up a builders guide. Should be done with this by the time I get the prototype batch (approx. 2 weeks).
First pic is a screen shot of the pcb (I use FreePCB which is GREAT!!).
other pics are my Fracanana version (fracanana.com will be up and going shortly), and the silver face 1/4" version (dotcom/Moog size) shows normalized signal flow (follow the arrows).
Get in touch, anyone, if interested.
Thanks,
p.
| Description: |
|
| Filesize: |
140.83 KB |
| Viewed: |
192 Time(s) |
| This image has been reduced to fit the page. Click on it to enlarge. |
|
| Description: |
|
| Filesize: |
229.19 KB |
| Viewed: |
155 Time(s) |
| This image has been reduced to fit the page. Click on it to enlarge. |
|
| Description: |
|
| Filesize: |
155.17 KB |
| Viewed: |
152 Time(s) |
| This image has been reduced to fit the page. Click on it to enlarge. |
|
|
|
|
Back to top
|
|
|
mono-poly
Joined: Jul 07, 2004
Posts: 937
Location: Rotterdam, Netherlands
Audio files: 2
|
| Posted: Sun Mar 08, 2009 10:03 am Post subject:
|
|
|
| count me in |
|
|
Back to top
|
|
|
neandrewthal
Joined: May 11, 2007
Posts: 672
Location: Canada
|
| Posted: Sun Mar 08, 2009 2:51 pm Post subject:
|
|
|
WOW! The frac version looks great! I thought I was going to be the first to have color matched jacks/knobs, but you beat me to it. We even have the same color scheme: blue cv in, green audio in and yellow audio out.
_________________
" I went through quite a few trannies til I found one I liked" - Wild Zebra |
|
|
Back to top
|
|
|
whomper
Joined: Dec 15, 2007
Posts: 201
Location: Israel
Audio files: 2
|
|
|
Back to top
|
|
|
The Bad Producer
Joined: Mar 08, 2009
Posts: 282
Location: The Manhole
|
| Posted: Sun Mar 08, 2009 5:21 pm Post subject:
|
|
|
Hi Peng,
I'd be interested in two or so, what sort of price are you thinking for the boards?
Ta,
Bad
PS that Fracanana looks really very cool... |
|
|
Back to top
|
|
|
fluxmonkey
Joined: Jun 24, 2005
Posts: 708
Location: cleve
|
| Posted: Sun Mar 08, 2009 5:31 pm Post subject:
|
|
|
Two boards for me.
The frac layout looks cool... but any chance you'll also offer 1/8" frac version as well? i for one would be more likely to purchase...
b
_________________
www.fluxmonkey.com |
|
|
Back to top
|
|
|
scriptstyle
Joined: Jan 22, 2008
Posts: 250
Location: nj
|
| Posted: Sun Mar 08, 2009 10:22 pm Post subject:
|
|
|
| i might be interested depending on funds when this happens. i will be keeping track... |
|
|
Back to top
|
|
|
fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
|
| Posted: Mon Mar 09, 2009 12:19 am Post subject:
|
|
|
hi peng, great work. i love this one!
_________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
|
|
Back to top
|
|
|
|
Forum index » DIY Hardware and Software
FAQ
Calendar
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
Chat Room
