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 Forum index » DIY Hardware and Software » Jürgen Haible designs
Variable Slope Filter / Phaser
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interested?
yes
88%
 88%  [ 37 ]
no
11%
 11%  [ 5 ]
Total Votes : 42

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The Bad Producer



Joined: Mar 08, 2009
Posts: 255
Location: The Manhole

PostPosted: Sat Apr 13, 2013 3:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've just pulled my module, and reverse engineered it (still can't believe I have no idea what I did there!)

I've drawn a diagram of the switch connections, hope it makes sense, the labelling for the contacts might be incorrect, but you'll get the idea!

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Actually I wonder if it is right, seems to make sense I think...

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sduck



Joined: Dec 16, 2007
Posts: 442
Location: Nashville
Audio files: 5

PostPosted: Sat Apr 13, 2013 6:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes, I think that about nails it! Completely bypasses the mix pot when in the filter position. Good work!
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The Bad Producer



Joined: Mar 08, 2009
Posts: 255
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PostPosted: Sun Apr 14, 2013 2:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Actually, after playing around with it last night in more of a 'test' mode - rather than using it for music - I reckon you could do without the switch if you wanted, there doesn't seem to be any difference between pot full wet and switch on...
It IS useful as a performance on/off switch though, and for that reason alone I would include it...

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Boerge



Joined: Sep 02, 2009
Posts: 41
Location: Germany

PostPosted: Tue Jun 11, 2013 12:21 pm    Post subject: Adjustment Reply with quote  Mark this post and the followings unread

Hi all,

trying to adjust the Varislope Filter I run into problems. I followed the steps on Jurgens website, but the only voltage I could adjust was the -7.5 Volts on R82, the other points never reach this voltage, for example the voltage on R71 doesnt go lower than ca. -3 Volts. I changed the three LM13700 and also the TL072 (U12), but no change. On pin 1 of U12 I measure ~10 Volts, can anybody confirm this? I had the cutoff pot not connected, the LFO depth pot in ccw position and the CV inputs shorted to GND.

regards

Boerge

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sduck



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PostPosted: Mon Jun 17, 2013 7:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

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