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 Forum index » DIY Hardware and Software
LM4250 VCF rev5 PCB EURORACK/FRAC run
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haxster



Joined: Feb 01, 2006
Posts: 244
Location: MONTEREY PARK, CA 91754
G2 patch files: 2

PostPosted: Thu Jan 06, 2011 9:14 pm    Post subject: LM4250 VCF rev5 PCB EURORACK/FRAC run Reply with quote  Mark this post and the followings unread

NEW REV 6 IN EFFECT. IF YOU WANT ONE GO POST IN THIS THREAD:

http://www.electro-music.com/forum/topic-48995.html
----------------------------------------------------------------------------
This is REV5 old thread........
I revised another version of this circuit on pcb. I made it even easier to build and it can be self mounted. I added some screw holes in case you did not want to use the pcb mount parts. I designed this to be as pro as the other companies out there.
The power connector is in EURORACK format.
The core circuit did not change. I did get rid of the Pre-amp. It was nice but I wanted to make it compact. The Bi-polar FM is still there.

Anyone who missed out on the last run please let me know if you would be interested in getting one. I am asking $17.00 with shipping included WORLDWIDE USPS.Posted Image, might have been reduced in size. Click Image to view fullscreen.

The switch is this kind:Posted Image, might have been reduced in size. Click Image to view fullscreen.

The onboard 3.5mm jack is this kind:Posted Image, might have been reduced in size. Click Image to view fullscreen.[url][/url]

Last edited by haxster on Fri Aug 05, 2011 11:04 am; edited 2 times in total
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haxster



Joined: Feb 01, 2006
Posts: 244
Location: MONTEREY PARK, CA 91754
G2 patch files: 2

PostPosted: Thu Jan 06, 2011 9:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

The other IDC looking connector location is where you solder wires going to your jacks: BP out, FM in, etc. I use an IDC connector to another JACK pcb eliminating wires altogether.
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snebenan



Joined: Oct 03, 2010
Posts: 13
Location: Sweden

PostPosted: Fri Jan 07, 2011 1:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Awesome!
I'm interested in two PCB's.
Do you want A PM with my details or how do you prefer to gather orders?
//s
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haxster



Joined: Feb 01, 2006
Posts: 244
Location: MONTEREY PARK, CA 91754
G2 patch files: 2

PostPosted: Fri Jan 07, 2011 6:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

I am waiting for about 15-20 pcb requests before I order them. everyone interested just post a reply how many you want and later I will remind all to gather the funds to make the order. The turn around is about 7-10 days for pcb arrival and shipping out.
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a100user



Joined: Oct 28, 2003
Posts: 147
Location: UK

PostPosted: Sat Jan 08, 2011 12:33 am    Post subject: Reply with quote  Mark this post and the followings unread

I'll take 1 please.

Cheers

David
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kollo



Joined: Jun 02, 2009
Posts: 19

PostPosted: Sat Jan 08, 2011 3:09 am    Post subject: Reply with quote  Mark this post and the followings unread

I'll take one as well!
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rosch



Joined: Oct 03, 2009
Posts: 162
Location: germany

PostPosted: Sat Jan 08, 2011 10:36 am    Post subject: Reply with quote  Mark this post and the followings unread

i'd like 1 also.
thanks!
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haxster



Joined: Feb 01, 2006
Posts: 244
Location: MONTEREY PARK, CA 91754
G2 patch files: 2

PostPosted: Sat Jan 08, 2011 1:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

I made a mouse BOM. This does not have LM4250 or ic sockets though. You need to get those elsewhere. Digikey carries LM4250.

This BOM also does not include the other (5) 3.5mm Jacks needed for the other inputs. You can use your own sources.

I really recommend to get the included 3.5mm jack in the BOM even though you might use this pcb for MOTM or 1/4" jacks. It serves as a strong pcb panel mount and you can use it to connect external 3.5mm gear. I have updated the pcb with another Audio In solder hole so if you were MOTM you can have a 1/4" jack also. On the picture above 'j6' has now become 'AIN1'

http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=5d03e5a824

Last edited by haxster on Mon Jan 24, 2011 1:23 pm; edited 1 time in total
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haxster



Joined: Feb 01, 2006
Posts: 244
Location: MONTEREY PARK, CA 91754
G2 patch files: 2

PostPosted: Sat Jan 08, 2011 1:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here is the general part list:

2011 LM4250 VCF PART LIST
----------------------------
IC:
(1) TL074
(2) LM4250

TRANSISTOR
(1) 2N2222A

CAPACITORS:
(2) 10UF 0.1" SPACING
(2) 100NF 0.2" SPACING (5.08mm)
(2) 2UF - 2.2UF NON POLAR CAP

TRIMMER:
(1) 100K MULTI-TURN TRIMMER

POTENTIOMETERS:
(1) 10kK LINEAR

(2) 100K LINEAR

RESISTORS:
(6) 1K
(7) 10K
( 8 ) 100K
(1) 150K
(2) 1M
(1) 27K
(2) 10R-22R PROTECTION
(2) 200K
(1) 3K
(1) 4K7
(2) 47K

CONNECTORS
-----------------
(1) IDC 16 PIN HEADER (8X2 DOUBLE ROW) 0.1" SPACING
THIS IS FOR EURORACK TYPE POWER CONNECTION.

OPTIONAL:
-----------------
(2) SPDT TOGGLE SWITCHES FOR REZ HACK SWITCHES. ONE SWITCH RELAXES THE NOTCH, THE OTHER PUSHES THE NOTCH A BIT MORE.
THE LOCATION FOR THIS IS LABELED H1,CMN,H2. YOU HAVE TO SOLDER WIRES TO SWITCHES IF YOU WANT TO USE THIS FEATURE.
THE CMN (COMMON) GOES TO BOTH SWITCHES CENTER PIN. H1 GOES TO ONE SWITCH, H2 GOES TO THE OTHER.

Last edited by haxster on Sat Jan 08, 2011 1:37 pm; edited 1 time in total
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haxster



Joined: Feb 01, 2006
Posts: 244
Location: MONTEREY PARK, CA 91754
G2 patch files: 2

PostPosted: Sat Jan 08, 2011 1:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

If this is your first DIY build and you own a EuroRack system I really recommend you try this out. You really can't mess up. It works at first power on, of coarse you have to turn the trimmer for proper Cutoff knob range. No measuring devices needed. It's adjusted by ear. Of coarse if you make a soldering mess and stuff the IC's wrong it will not work! Just be neat and patient.

Don't go mad trying to source the original UA Russian IC. The LM4250 has a flavor of it's own, respect it also. Just build and make noise.
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fluxmonkey



Joined: Jun 24, 2005
Posts: 696
Location: cleve

PostPosted: Sat Jan 08, 2011 4:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

i would take 2, thx
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RSFC



Joined: Sep 02, 2010
Posts: 63
Location: space lab

PostPosted: Sat Jan 08, 2011 8:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'll take 1
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Danno Gee Ray



Joined: Sep 25, 2005
Posts: 1342
Location: Telford, PA USA

PostPosted: Sat Jan 08, 2011 9:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm in for 1.
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LektroiD



Joined: Aug 23, 2008
Posts: 977
Location: Scottish Borders
Audio files: 2
G2 patch files: 2

PostPosted: Sat Jan 08, 2011 11:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

1 here please Wink
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(check out the new Electro-Funk LP)
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haxster



Joined: Feb 01, 2006
Posts: 244
Location: MONTEREY PARK, CA 91754
G2 patch files: 2

PostPosted: Mon Jan 10, 2011 9:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

I made the order today.

So far I have this list:

DEGO-SWEDEN (2)
gpmacklin - USA SF (2)
snebenan - Sweden (2)
a100user (1)
kollo -SWEDEN (1)
rosch -GERMANY (1)
fluxmonkey -USA CLEVELAND (2)
RSFC (1)
Danno Gee Ray -USA PA (1)
LektroiD (1)
reflux (1)
iopop3 (1)
RF (2)
hodad -USA Atlanta (1)
synchroton -USA (1)
Rivelen -France (1)
tazer - UK (1)
diablojoy -Australia (2)



Feel free to jump aboard there is still room for this first run Rev5.
I should have it in my hands next week. I will build and post till then. It's a really slick design. Suitcase worthy stuff.

Last edited by haxster on Thu Jan 20, 2011 10:02 pm; edited 6 times in total
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reflux



Joined: Aug 22, 2009
Posts: 3
Location: Orange, Ca

PostPosted: Mon Jan 10, 2011 11:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'll take 1, thanks
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iopop3



Joined: May 28, 2010
Posts: 95
Location: Malmö, Sweden

PostPosted: Tue Jan 11, 2011 2:10 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm interested in one board.

Do you have any schema available? The pcb is rather easy to follow, but if you have a schema please post.

Any special mods needed if running on 15v?
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haxster



Joined: Feb 01, 2006
Posts: 244
Location: MONTEREY PARK, CA 91754
G2 patch files: 2

PostPosted: Tue Jan 11, 2011 2:28 am    Post subject: Reply with quote  Mark this post and the followings unread

No mods needed for 15v operation. There is a trimmer that can adjust for both formats. I personally have tried both 12v and 15v with no problems.


POLIVOKS LM4250.sch
 Description:

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 Filename:  POLIVOKS LM4250.sch
 Filesize:  28.73 KB
 Downloaded:  184 Time(s)

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a100user



Joined: Oct 28, 2003
Posts: 147
Location: UK

PostPosted: Tue Jan 11, 2011 3:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Haxter,

Sorry if this is a dumb question but what applications can read sch files?

Thanks

David
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Dego



Joined: Apr 22, 2008
Posts: 139
Location: Sweden

PostPosted: Tue Jan 11, 2011 5:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Eagle can read it

http://filext.com/file-extension/SCH
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RF



Joined: Mar 23, 2007
Posts: 1493
Location: Northern Minnesota, USA
Audio files: 28

PostPosted: Tue Jan 11, 2011 5:57 am    Post subject: Reply with quote  Mark this post and the followings unread

I'd like 2 please!
_________________
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"I want to make these sounds that go wooo-wooo-ah-woo-woo.”
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a100user



Joined: Oct 28, 2003
Posts: 147
Location: UK

PostPosted: Tue Jan 11, 2011 6:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Dego

David
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haxster



Joined: Feb 01, 2006
Posts: 244
Location: MONTEREY PARK, CA 91754
G2 patch files: 2

PostPosted: Tue Jan 11, 2011 9:57 am    Post subject: Reply with quote  Mark this post and the followings unread

This free program is where i made it also:

http://www.expresspcb.com/expresspcbhtm/download.htm

I did not order the PCB's there, i just used the software Wink
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rosch



Joined: Oct 03, 2009
Posts: 162
Location: germany

PostPosted: Tue Jan 11, 2011 10:01 am    Post subject: Reply with quote  Mark this post and the followings unread

i can't open it with eagle.
it says something like there's invalid data in the file.
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haxster



Joined: Feb 01, 2006
Posts: 244
Location: MONTEREY PARK, CA 91754
G2 patch files: 2

PostPosted: Tue Jan 11, 2011 10:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Here is the hole cutout if you plan to build the filter exactly the way I designed it. meaning you used all the pcb mount parts.

Download this free program to see it and to print it out.
http://www.abacom-online.de/uk/html/dateien/demos/viewlayout50.exe

When you print it out, uncheck "S2" to hide the measurements if you want.


EURO PANEL LM4250.zip
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 Filename:  EURO PANEL LM4250.zip
 Filesize:  11.74 KB
 Downloaded:  185 Time(s)

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