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 Forum index » DIY Hardware and Software » Developers' Corner
New module design: dual VCF
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Grumble



Joined: Nov 23, 2015
Posts: 1174
Location: Netherlands
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PostPosted: Mon Apr 18, 2016 2:16 am    Post subject: New module design: dual VCF
Subject description: Using puscaf MAX261 and AD9833 DDS
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I use two analog devices AD9833 for clock generation for the programmable universal switched capacitive filters MAX261.
The AD9833 must be the hardest part to solder in this build.


IMG_20160418_110853.jpg
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Remember: the perfboard holes are 0.1" apart...
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Grumble



Joined: Nov 23, 2015
Posts: 1174
Location: Netherlands
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PostPosted: Mon Apr 18, 2016 2:53 am    Post subject: Reply with quote  Mark this post and the followings unread

The preliminary diagram, no values filled in and it will evolve while building.


schematics 2VCF.JPG
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LFLab



Joined: Dec 17, 2009
Posts: 493
Location: Rosmalen, Netherlands

PostPosted: Wed Apr 20, 2016 11:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Dat is interessant! Hoe klinkt ie?

Pretty good! So how hard is it to solder that ic, a lot tighter than soic8?
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Grumble



Joined: Nov 23, 2015
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PostPosted: Wed Apr 20, 2016 12:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

How does it sound? Dunno, am soldering and designing the board.
I have already built a similar filter on my noise module and the soundfile of the noise module is here
The distance from center leg to the next is in the AD9833 0.5mm, while the SOIC has 1.27mm, so yes, soldering is quite tedious. Luckely I have an old stereo preparation microscope to do this kind of work.
I will build the filter on the board and than breadboarding the controls for testing purposes.
Each MAX261 has two filters on board, and the idea is to have the first used as a low pass filter and its output fed into the next and from the second filter section to use the low pass and band pass filter and make some kind of cross over and also add the original signal (the amplification of one section is -1x so two in series makes a 1x amplification, so in phase with the input exept near the center frequency of the filter).
So, I don't know how the end result will be schematics and sound wise...


soic.jpg
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This is about the same scale
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Grumble



Joined: Nov 23, 2015
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Location: Netherlands
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PostPosted: Sat Apr 23, 2016 1:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

I have been programming the filter, and here are the first results.
Now the face plate and the wiring...


sqaure fast response.wav
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Download
 Filename:  sqaure fast response.wav
 Filesize:  4.75 MB
 Downloaded:  560 Time(s)


square sweep filter high q.wav
 Description:

Download
 Filename:  square sweep filter high q.wav
 Filesize:  3.04 MB
 Downloaded:  539 Time(s)


square sweep filter low q.wav
 Description:

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 Filename:  square sweep filter low q.wav
 Filesize:  5.93 MB
 Downloaded:  556 Time(s)


square sweep filter mid q.wav
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 Filename:  square sweep filter mid q.wav
 Filesize:  2.93 MB
 Downloaded:  544 Time(s)


noise change q.wav
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 Filename:  noise change q.wav
 Filesize:  5.68 MB
 Downloaded:  513 Time(s)

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Grumble



Joined: Nov 23, 2015
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PostPosted: Sat Apr 23, 2016 1:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

Very Happy


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Blue Hell
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Joined: Apr 03, 2004
Posts: 23378
Location: The Netherlands, Enschede
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PostPosted: Sun Apr 24, 2016 12:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nice! I like your non-standard approach to design of musical circuits.
_________________
Jan
also .. could someone please turn down the thermostat a bit.
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Grumble



Joined: Nov 23, 2015
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PostPosted: Sun Apr 24, 2016 3:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you!
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Cfish



Joined: Feb 24, 2016
Posts: 477
Location: Indiana

PostPosted: Sun Apr 24, 2016 8:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

Very nice. And that's no easy soldering job even with a stereo microscope. I tried a little basic SMT once, finally took it to a customer of mine who did it roboticly. Was cool to see that, but I think your solder job looks just as good.
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Grumble



Joined: Nov 23, 2015
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PostPosted: Mon Apr 25, 2016 1:22 am    Post subject: Reply with quote  Mark this post and the followings unread

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Wink
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