MUFF WIGGLER Forum Index
 FAQ & Terms Of UseFAQ & Terms Of Use   Wiggler RadioWiggler Radio   SearchSearch   Muff Wiggler Blog & NewsBlog & News   Muff Wiggler StoreMW Store 
 RegisterSign up   Log inLog in 

Pseudo .5 291 Bandpass Filter BoardGoto page 1, 2, 3 ... 25, 26, 27  Next [all]
 MUFF WIGGLER Forum Index -> Music Tech DIY
View previous topic :: View next topic  
Author Pseudo .5 291 Bandpass Filter Board
J3RK
Super Deluxe Wiggler


Joined: 22 Dec 2009
Last Visit: 27 Feb 2015

Posts: 3796
Location: Seattle

PostPosted: Thu Sep 29, 2011 11:41 am    Post subject: Pseudo .5 291 Bandpass Filter Board Reply with quote Add User to Ignore List

Hello,

Just thought I'd move discussion of this to a new thread. I've got a board around 75% laid out now. (first pass, so there will need to be some optimization, fixes, and I'm planning some additions/mod-space) I plan to order prototypes within the next couple of weeks.

Basically it's a single 291 bandpass filter. I'm looking into tapping/mixing other responses now too.

I've decided to do one filter per board using a smaller board. They'll be stackable with thru-power header like the .5 258 boards. This should also help with putting multiple boards into smaller formats. I'm planning a quad-board module myself that can be used as a resonant eq, or formant filter.

Anyway, I'll start updating this thread with any major progress, and hope to have a final design ready within a month or so.

Here's the basic BOM:

Code:
Bill Of Materials
=================


QTY  PART-REFS           VALUE                         
---  ---------           -----                                       
Resistors
---------
2    R1,R45              47k                                               
1    R2                  2.2M                                             
4    R3,R8,R12,R31       6.8k                                             
2    R4,R13              33k                                               
4    R5,R15,R25,R32      10k                                               
1    R6                  5.6k                                             
2    R9,R14              10M                                               
2    R18,R19             4.7k                                             
4    R20,R21,R28,R29     1.5k                                             
1    R22                 1M                                               
2    R23,R26             15K                                               
1    R24                 68R                                           
5    R27,R33,R34,R48,R49 1k                                               
1    R30                 4.7M                                             
1    R35                 100k                                             
1    R36                 220R                                             
2    R38,R39             62K                                               
2    R42,R43             68K

***MODS***
R24=33R
R27=100R
                           
Capacitors
----------
1    C1                  1000pf                                           
2    C2,C5               .022                                             
1    C3                  220pF                                             
1    C4                  15uF                                             
1    C6                  470pF                                             
1    C7                  47pF                                             
1    C8                  .47

***MODS***
C2,C5=.047                                               

Integrated Circuits
-------------------
1    U1                  TL071                                             
1    U2                  TL074                                             
1    U3                  TL072                                             

Transistors
-----------                           
2    Q1,Q2               2N3904

***MODS***
Q1,Q2=2N5089 (sounds a little nicer to me anyway)
                                           

Diodes
------
1    D1                  DIODE-ZEN 3.9V                                       
1    D2                  1N4148                                           

Miscellaneous
-------------
1    Q                   100k
4    CF,CF CV,WIDTH,     10k                                               
1    FM                  50K                                                                                                                                   
4    VT1-VT4             OptoCoupler                                               
1    WIDTH TRIM          5k   


2 10uF or higher electrolytic caps for power filtering.
4 .01uF bypass capacitors (labeled BP1-BP4) *


***Errors***

There are two small silk-screen errors on the board unfortunately. On the left side of the board where the controls attach, there are two resistors labeled R21. The top one should actually be R43.

* There seems to be a "bonus" bypass cap on the board. You can populate it or not. (it's an unlabeled cap) Just drop a .01 in there if you feel like it. The original layout didn't have bypass caps at all, so they are optional.

** This is a silly one, but basically the "Q" header at the top-left of the board, is more or less useless. This was on the schematics that I was working from, so I included it. The real resonance/Q trim is the 5K WTrim pot, which will adjust the resonance for the Width control. This is really something that I feel is best left to a trim-pot. Just set it the way you like it, and you're good. I'm actually not sure what the original intent of the 100K pot on the input is. While it does make very slight changes to the signal, it's definitely not audible, so it's entirely optional.

Also, here is the schematic for those interested:

http://home.comcast.net/~r3cogniz3r/291j.pdf


Last edited by J3RK on Mon Jan 26, 2015 11:40 am; edited 12 times in total
Back to top
View user's profile Send private message
giorgio
NITE MIND


Joined: 24 Oct 2009
Last Visit: 25 Feb 2015

Posts: 2400
Location: BRAND NEW YORK

PostPosted: Thu Sep 29, 2011 11:46 am    Post subject: Reply with quote Add User to Ignore List

cool. this may be the extra filter I'm looking for for my DIY synth, especially if a highpass output could be tapped.
_________________
▲✌♡✂☃☂☁☀☻☹☺♢✄✐☒☠☣☢☤☎✇✈✖▼


Last edited by giorgio on Thu Sep 29, 2011 8:23 pm; edited 1 time in total
Back to top
View user's profile Send private message
PF
Wiggling with Experience


Joined: 02 Jan 2010
Last Visit: 24 Feb 2015

Posts: 453
Location: Sweden/Stockholm

PostPosted: Thu Sep 29, 2011 1:24 pm    Post subject: Reply with quote Add User to Ignore List

yes, yes, yes....... please.

4 boards.


Last edited by PF on Sat Oct 15, 2011 3:02 am; edited 2 times in total
Back to top
View user's profile Send private message
rico loverde
Super Deluxe Wiggler


Joined: 06 Aug 2010
Last Visit: 28 Feb 2015

Posts: 3736
Location: Portland, Oregon

PostPosted: Thu Sep 29, 2011 1:31 pm    Post subject: Reply with quote Add User to Ignore List

applause
_________________
works for Darkplace Manufacturing
Back to top
View user's profile Send private message Send e-mail
Luka
Super Deluxe Wiggler


Joined: 15 Jul 2008
Last Visit: 28 Feb 2015

Posts: 5250
Location: melbourne

PostPosted: Thu Sep 29, 2011 1:32 pm    Post subject: Reply with quote Add User to Ignore List

great - i really like my 291s
i would like to have a bank of them

_________________
.
.
.
.

melbourne australia
soundcloud
vimeo
Back to top
View user's profile Send private message
KNYST
hiding in the forest


Joined: 26 Jan 2009
Last Visit: 28 Feb 2015

Posts: 2758
Location: the Taiga, Sweden

PostPosted: Thu Sep 29, 2011 1:58 pm    Post subject: Reply with quote Add User to Ignore List

Thank you J3RK! I'm in: 2 please.
_________________
NOISE HEALS.
patch responsibly.
LISTEN | WATCH
>> The KNYST GONG performances!


Last edited by KNYST on Sat Oct 08, 2011 10:41 am; edited 1 time in total
Back to top
View user's profile Send private message
kdub
Learning to Wiggle


Joined: 12 Jan 2011
Last Visit: 06 Oct 2013

Posts: 15
Location: yeg

PostPosted: Thu Sep 29, 2011 2:03 pm    Post subject: Reply with quote Add User to Ignore List

yes! x4 sounds good to me. I was thinking about building a cgs serge resonant equalizer, but I think a j3rk pseudo 291 is first in order.
Back to top
View user's profile Send private message
boothnavy
Ultra Wiggler


Joined: 29 Mar 2010
Last Visit: 12 Feb 2015

Posts: 790
Location: Boston

PostPosted: Thu Sep 29, 2011 3:22 pm    Post subject: Reply with quote Add User to Ignore List

Uh huh, yup.
_________________
boothnavy - synthesist

www.analogcraftsman.com
Back to top
View user's profile Send private message
negativspace
Manhattan Analog


Joined: 13 Apr 2010
Last Visit: 28 Feb 2015

Posts: 5686
Location: Manhattan, KS

PostPosted: Thu Sep 29, 2011 3:38 pm    Post subject: Reply with quote Add User to Ignore List

screaming goo yo
_________________
cretaceousear wrote:

But really, why don't we dream more music?
Back to top
View user's profile Send private message
Junk Rhythm
Big Bottom Shaker


Joined: 11 Mar 2009
Last Visit: 27 Feb 2015

Posts: 1923
Location: Los Angeles, CA

PostPosted: Thu Sep 29, 2011 7:18 pm    Post subject: Reply with quote Add User to Ignore List

You can count me in for 4 PCBs.
_________________
[toppobrillo] [video] [twitter] [blog] [flickr] [audio] [modular grid]
Back to top
View user's profile Send private message
gwaidan
Super Deluxe Wiggler


Joined: 07 Mar 2009
Last Visit: 26 Feb 2015

Posts: 1873
Location: Sydney

PostPosted: Thu Sep 29, 2011 7:26 pm    Post subject: Reply with quote Add User to Ignore List

Count me in for at least 2 PCBs
Back to top
View user's profile Send private message
decaying.sine
Broken <--> Fixed


Joined: 03 Jun 2009
Last Visit: 02 Dec 2014

Posts: 5397
Location: Branford, CT USA

PostPosted: Thu Sep 29, 2011 8:25 pm    Post subject: Reply with quote Add User to Ignore List

I'll take around 4!

Actually, I'll just take 2-4 of anything, come to think of it!

Thanks J3RK.

_________________
Brian
"I must create a system or be enslaved by another mans; I will not reason and compare: my business is to create." William Blake

"Vactrols ringing, Dude." "Thank you Donny"
Back to top
View user's profile Send private message Send e-mail
toppobrillo
Ultra Wiggler


Joined: 07 Dec 2008
Last Visit: 19 Feb 2015

Posts: 837
Location: OAK

PostPosted: Thu Sep 29, 2011 9:08 pm    Post subject: Reply with quote Add User to Ignore List

Ill take a couple!
_________________
tw i t ter
sight
sound
Back to top
View user's profile Send private message
gigasturtz
Wiggling with Experience


Joined: 12 Sep 2011
Last Visit: 09 Feb 2015

Posts: 265

PostPosted: Thu Sep 29, 2011 9:32 pm    Post subject: Reply with quote Add User to Ignore List

yes please!
Back to top
View user's profile Send private message
diophantine
Super Deluxe Wiggler


Joined: 10 Jan 2011
Last Visit: 24 Jan 2015

Posts: 1431
Location: San Diego, CA

PostPosted: Thu Sep 29, 2011 9:35 pm    Post subject: Reply with quote Add User to Ignore List

Awesome! Count me in for 4.

Last edited by diophantine on Thu Oct 06, 2011 7:49 pm; edited 1 time in total
Back to top
View user's profile Send private message
Peake
I'm in ur DIY. Filling cases with Buchla


Joined: 07 Nov 2008
Last Visit: 28 Feb 2015

Posts: 3408
Location: Loss Angeles

PostPosted: Thu Sep 29, 2011 10:20 pm    Post subject: Reply with quote Add User to Ignore List

Yes, please include the lowpass and highpass outputs! Check that EM thread as one of them, IIRC the LPF, is out of phase.

Very cool!

_________________
I just can't help imagining that this would be better with vactrols
Back to top
View user's profile Send private message Send e-mail
patchdub
Wiggling with Experience


Joined: 19 Dec 2008
Last Visit: 08 Feb 2015

Posts: 424
Location: Taos, NM

PostPosted: Thu Sep 29, 2011 10:36 pm    Post subject: Reply with quote Add User to Ignore List

saweeeet!
_________________
www.patchdub.com
http://patchdub.bandcamp.com/
http://soundcloud.com/patchdub
Back to top
View user's profile Send private message
Rod Serling Fan Club
aquatic hitchhiker


Joined: 14 Dec 2009
Last Visit: 28 Feb 2015

Posts: 3675
Location: Germany

PostPosted: Thu Sep 29, 2011 11:37 pm    Post subject: Reply with quote Add User to Ignore List

I agree, all 3 outputs and I'm down for 2-4 depending on price.
_________________
youtube channel: http://www.youtube.com/user/MrPalebluedot
Back to top
View user's profile Send private message
Isaiah
Super Deluxe Wiggler


Joined: 02 Jun 2010
Last Visit: 28 Feb 2015

Posts: 1318

PostPosted: Fri Sep 30, 2011 1:47 am    Post subject: Reply with quote Add User to Ignore List

Sounds tempting!

Will the PCBs be Euro compatible (Voltage/PSU Header etc)?

How big will they be?
If they were small enough that you could parallel mount/stack 2 or 3 behind, say, a 14HP panel, that would be great!


Cheers!

_________________
S Y N T H C U R I O U S - 20-21/3/2015 Coventry, UK
Modular Meet // Films // Talks // Performances by Sonic Boom (20th), Wrangler and Attrition (21st)

For Sale
Moog MF-103, Din-Sync OSC303 Mk I VCOs (x2), EHX Pedals, Yamaha VSS-200, PCB Backlog
Back to top
View user's profile Send private message
rosch
roadkill


Joined: 23 Dec 2010
Last Visit: 26 Feb 2015

Posts: 636
Location: doucheland

PostPosted: Fri Sep 30, 2011 1:54 am    Post subject: Reply with quote Add User to Ignore List

hyper

edit: i'd take at least 2, maybe more
great project, J3RK


Last edited by rosch on Fri Sep 30, 2011 9:39 am; edited 1 time in total
Back to top
View user's profile Send private message Send e-mail
astroschnautzer
Super Deluxe Wiggler


Joined: 19 Nov 2008
Last Visit: 20 Feb 2015

Posts: 1469
Location: Finland

PostPosted: Fri Sep 30, 2011 2:22 am    Post subject: Reply with quote Add User to Ignore List

Me is in 4 4.
_________________
http://bechamelboyz.bandcamp.com/album/skuuggenheim
http://astroschnautzer.bandcamp.com/
http://freudian-slip-records.bandcamp.com/


Last edited by astroschnautzer on Fri Sep 30, 2011 3:09 am; edited 1 time in total
Back to top
View user's profile Send private message
J3RK
Super Deluxe Wiggler


Joined: 22 Dec 2009
Last Visit: 27 Feb 2015

Posts: 3796
Location: Seattle

PostPosted: Fri Sep 30, 2011 2:26 am    Post subject: Reply with quote Add User to Ignore List

Cool! Looks like there is a bit of interest for this. I now have the basic layout for the board done. I just learned where to tap the LP and HP from, and will add the connections for these tomorrow. There is a nice broad space for mod space that can be used for a mixer to mix the signals. I will leave that to the builder, however, this time I will add some default traces and SIL headers for controls. This way if someone wants to add a pot or two and a couple of jacks or switches, they won't need to run wires all over the place. I should be able to order a few protos by next week.

I plan to build a small mixer circuit in the mod space, so I will test it, and post my design. Since it will be so simple, I think it's a good fit or this. If someone doesn't need it, they can use the space for something else. I will make sure it will easily accommodate it, and a good set of controls. I need to order some VTL5C3s to test with. I do have some NSL32SR3s though, which should work for some initial testing. (with a possible difference in character of course.)


Last edited by J3RK on Fri Sep 30, 2011 2:28 am; edited 1 time in total
Back to top
View user's profile Send private message
regenbot
Ultra Wiggler


Joined: 21 Aug 2010
Last Visit: 28 Feb 2015

Posts: 953
Location: Finland

PostPosted: Fri Sep 30, 2011 2:26 am    Post subject: Reply with quote Add User to Ignore List

if euro compatible i'm in for a few.
_________________
sounds
drawings
free music
Back to top
View user's profile Send private message
J3RK
Super Deluxe Wiggler


Joined: 22 Dec 2009
Last Visit: 27 Feb 2015

Posts: 3796
Location: Seattle

PostPosted: Fri Sep 30, 2011 2:29 am    Post subject: Reply with quote Add User to Ignore List

Right now the board is around 3x3" or so. After I get the mixer area laid out, I will see if I can compact it further. I will test on 12v, but can't think of any reason it shouldn't work. Depending on what happens in the mod space, I'll see if I can add a pin header for Euro power.
Back to top
View user's profile Send private message
ATOM
Common Wiggler


Joined: 31 Aug 2008
Last Visit: 28 Feb 2015

Posts: 211
Location: Norway

PostPosted: Fri Sep 30, 2011 7:04 am    Post subject: Reply with quote Add User to Ignore List

I take 4.

ATOM

_________________
http://atommodular.blogspot.com/

"One day we will be improved"
Back to top
View user's profile Send private message
Display posts from previous:   
 MUFF WIGGLER Forum Index -> Music Tech DIY
Goto page 1, 2, 3 ... 25, 26, 27  Next [all]
Page 1 of 27
Powered by phpBB © phpBB Group