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 Forum index » DIY Hardware and Software
dual 281 project [build related stuff only!]
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RSFC



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

PostPosted: Thu Mar 17, 2011 9:44 am    Post subject: Reply with quote  Mark this post and the followings unread

please do.
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e-grad



Joined: Sep 12, 2008
Posts: 142
Location: Berlin

PostPosted: Thu Mar 17, 2011 10:40 am    Post subject: Reply with quote  Mark this post and the followings unread

RSFC wrote:
please do.

Seconded.
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mph



Joined: Aug 25, 2007
Posts: 66
Location: France

PostPosted: Thu Mar 17, 2011 1:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

So here it is:
http://ubuntuone.com/p/iBO/

please note that this BOM is intented for 2 pcbs (to build the full Quad Function Generator).

Also I may have made some mistakes as I have not built it yet ( I'm in the ordering process for this module). This is based mainly on the V3 BOM published by Topp on his website.
Let me know if you find some errors (and sorry in advance if it's the case).

Cheers
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e-grad



Joined: Sep 12, 2008
Posts: 142
Location: Berlin

PostPosted: Fri Mar 18, 2011 7:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Awsome! Thanks!
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ericcoleridge



Joined: Jan 16, 2007
Posts: 885
Location: NYC

PostPosted: Fri Mar 18, 2011 11:36 am    Post subject: Reply with quote  Mark this post and the followings unread

e-grad wrote:
mph wrote:
what are the componments labelled "L+" and "L-"?
Are they ferrite beads, or 10ohm resistors?

I prefer beads but you can use 10 ohm or 22 ohm resistors as well.

Basically even a link will work.


Where do you guys source ferrite beads; I used to have a bunch of them, but I can't remember from where they came. The one's that I always see when I look are one's that are just beads, with out leads attached (?) What anyone uses leadless beads for, I don't know.
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mph



Joined: Aug 25, 2007
Posts: 66
Location: France

PostPosted: Sat Mar 19, 2011 3:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

Well, I don't know if it helps you, but I've bought some in a small shop in France:
http://www.gotronic.fr/catalog/hf/self.htm

the VK200 ferrite beads are at the end of this page.
Maybe the specs will help to find a sub?
"VK200:
Self d'arrêt et de découplage VHF.
Impédance: >700 ohms à 180 MHz.
Inductance: 10 µH.
Matériau: 4B1.
Diamètre: 6 mm.
Longueur: 10 mm."
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rosch



Joined: Oct 03, 2009
Posts: 159
Location: germany

PostPosted: Sat Mar 19, 2011 6:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

there are some at mouser, but haven't ordered there.
actually i've bought some fairrite beads on ebay, from somewhere in the US. i'm not sure about the right values, but it works, apparently.
i also have some beads without leads, just the hole. i haven't tried them yet, as i'm not sure if the wire put through has to be isolated or can be just blank wire.
at least the wired beads didn't show continuity between the body and the wire.
maybe someone else knows about that?
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e-grad



Joined: Sep 12, 2008
Posts: 142
Location: Berlin

PostPosted: Sun Mar 20, 2011 8:26 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm using these beads: 623-2743002112LF [= Mouser part #]
http://de.mouser.com/ProductDetail/Fair-Rite/2743002112/?qs=X2DWwR3nihDJfxeTNAhF3w%3d%3d
http://de.mouser.com/catalog/643/1006.pdf
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beautyofdecay_



Joined: Aug 14, 2009
Posts: 38
Location: Netherlands

PostPosted: Mon Mar 21, 2011 12:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm using these from Mouser: 667-EXC-ELSA35V.

Also seem to work fine.

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snebenan



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

PostPosted: Wed Mar 30, 2011 12:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the BOM mph,

Just to be clear, the CD4016B. that would be the same as a CD4016BE right?

And the same question goes for CD4001B, CD4001BE is OK?

This is probably obvious things for most pepole, but I still find IC naming to be very confusing Embarassed
//s
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mph



Joined: Aug 25, 2007
Posts: 66
Location: France

PostPosted: Wed Mar 30, 2011 2:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

I think they are the same as I have found no differences between the datasheets.
The "E" may signify that the chip is ROHS compliant or something like that.
Also look for the PDIP 14 package.
So the TI chip is the CD4016BE; but the On Semi is labelled MC14016B...
Same story for the CD4001B.
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snebenan



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

PostPosted: Wed Mar 30, 2011 11:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ok, I'm still confused by the naming but now I know i buying the right stuff Laughing
Thanks agin mph
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beautyofdecay_



Joined: Aug 14, 2009
Posts: 38
Location: Netherlands

PostPosted: Thu Apr 07, 2011 2:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Just a few pics of my 281 prototype, Buchla style.

Before ordering a professionally made panel I made a panel out of 3mm thick scrap wood to check out if everything would fit on and behind the panel. The panel design was made in Front Panel Designer and printed on paper.

I made a custom bracket to mount the PCBs so I wouldn't have to drill additional holes in the front panel.
The total depth behind the panel (power cable included) is about 9 cm (3.5").

Looking at it I think I will drill some extra holes in the bracket to allow easier routing of wires to the PCBs.

Although I built a Klee sequencer I am a bit hesitant to start wiring this... Wink

Maybe it gives you some ideas of how to mount everything to your own panel.


buchla281_prototype2.jpg
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Buchla 281 prototype
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buchla281_prototype2.jpg



buchla281_prototype1.jpg
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Buchla 281 prototype
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buchla281_prototype0.jpg
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Buchla 281 front panel prototype
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buchla281_prototype0.jpg



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cbm



Joined: Oct 25, 2005
Posts: 381
Location: San Francisco

PostPosted: Thu Apr 07, 2011 3:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

I may be alone in this, but I have a problem with actually putting "Buchla & Associates" on the front panel. To me, that moves it from the realm of tribute, into the realm of forgery.
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beautyofdecay_



Joined: Aug 14, 2009
Posts: 38
Location: Netherlands

PostPosted: Thu Apr 07, 2011 4:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Chris,

You may be right about that.
This is just a prototype printed on a piece of paper. Now I think about it, I will remove the name from the final panel.

What I wanted to show however was the mounting of the PCBs to the panel Wink

Regards, Andre.

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TekniK



Joined: Aug 10, 2008
Posts: 1062

PostPosted: Thu Apr 07, 2011 11:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

Looks great beauty,what will cost you more or less a proffesional made panel,if i may ask?
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beautyofdecay_



Joined: Aug 14, 2009
Posts: 38
Location: Netherlands

PostPosted: Fri Apr 08, 2011 10:55 am    Post subject: Reply with quote  Mark this post and the followings unread

The panel in the picture would cost 135 Euros at Schaeffer. A bit too much for my taste.

I'm looking into local/national companies who can do silk screened panels but do not know any pricing yet.

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reve



Joined: Feb 23, 2008
Posts: 147
Location: USA

PostPosted: Fri Apr 22, 2011 1:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

So hey, I'm going to have to put in an order of resistors somewhere because I'm straight out of metal films in some common values.

Buuuuut I still have gobs of 5% carbons laying about. I'm curious what you guys think about using 5%ers in the 281 project? Any particular places I should use tighter tolerance parts?

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SynthDIY Synthpop -> http://www.reverbnation.com/photovoltaik
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toppobrillo



Joined: Dec 10, 2005
Posts: 766
Location: oakland, ca
G2 patch files: 1

PostPosted: Sat Apr 23, 2011 9:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

use the 5% resistors anywhere you like if you got em. 49.9Ks aren't available in 5% though.
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reve



Joined: Feb 23, 2008
Posts: 147
Location: USA

PostPosted: Tue Apr 26, 2011 11:17 am    Post subject: Reply with quote  Mark this post and the followings unread

toppobrillo wrote:
use the 5% resistors anywhere you like if you got em. 49.9Ks aren't available in 5% though.


Thanks, topp!

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emdot_ambient



Joined: Nov 22, 2009
Posts: 669
Location: Frederick, MD

PostPosted: Wed Apr 27, 2011 7:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

OK.......why are there pads between the 49.9K resistors to the top left and right of the 4016, and the 49.9K and 1K* below them?

Inquiring minds and all that...

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zthee



Joined: Feb 20, 2008
Posts: 413
Location: Stockholm

PostPosted: Mon May 02, 2011 7:49 am    Post subject: Reply with quote  Mark this post and the followings unread

emdot_ambient wrote:
OK.......why are there pads between the 49.9K resistors to the top left and right of the 4016, and the 49.9K and 1K* below them?

Inquiring minds and all that...


Isn't it a via? The trace switches from the top to the bottom.

Don't have the board in front of me...

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emdot_ambient



Joined: Nov 22, 2009
Posts: 669
Location: Frederick, MD

PostPosted: Mon May 02, 2011 8:22 am    Post subject: Reply with quote  Mark this post and the followings unread

zthee wrote:
emdot_ambient wrote:
OK.......why are there pads between the 49.9K resistors to the top left and right of the 4016, and the 49.9K and 1K* below them?

Isn't it a via? The trace switches from the top to the bottom...

Ah...yeah, could very well be. Just thought they were a bit big for that, I thought usually vias were smaller, though there's no reason they'd have to be. I saw somewhere (was it MOTM kits or Oakley?) suggested you solder vias to make sure there's a good solid connection. Probably not necessary.

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zthee



Joined: Feb 20, 2008
Posts: 413
Location: Stockholm

PostPosted: Mon May 02, 2011 8:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Double checked it now. It's not a via. Smile

Seems like an experimental thing to connect pin 1 to pin 4?

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emdot_ambient



Joined: Nov 22, 2009
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PostPosted: Mon May 02, 2011 9:20 am    Post subject: Reply with quote  Mark this post and the followings unread

I.e. it's still a dunno
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