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 Forum index » DIY Hardware and Software
Mr. Haible's OB-Xa sound mod for OB-8
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j.dilisio



Joined: May 19, 2009
Posts: 186
Location: baltimore

PostPosted: Sat Oct 20, 2012 3:44 pm    Post subject:  Mr. Haible's OB-Xa sound mod for OB-8
Subject description: anyone else try this? Not working for me.
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I just tried the OB-8 mod as described here..
http://machines.hyperreal.org/manufacturers/Oberheim/OB-8/mods/OB-8.mod.txt
.. but rather than opening up the sound what I got was muted low frequencies.
It looks so simple. A resistor and a capacitor in series- in parallel to another resistor.. and this is supposed to offset the 22Hz highpass.

I don't really understand the electronics enough to know if he might have made a mistake listing a value or not.
Has anyone else had good results from this mod?

Thanks,
J

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j.dilisio



Joined: May 19, 2009
Posts: 186
Location: baltimore

PostPosted: Sun Dec 09, 2012 6:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

I never did get this to work but I did successfully manage Jurgen's multimode filter mod..
http://www.jhaible.de/hjob8mod.html
.. and it rocks! I would highly recommend this to any OB-8 owners.
The high pass filter really opens up a new sonic spectrum for this instrument.

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radek tymecki



Joined: Mar 22, 2009
Posts: 76
Location: PL

PostPosted: Mon Dec 10, 2012 12:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

i've managed to do audio mod and there was a diffrence to me! i did it on one board and compared 2 voiceboards. the one with mod had low freq boost

i always wanted to make a multimode modification but i was afraid I could not handle Sad i was speaking bout it with Juergen but suddenly he passed away... Sad

do You have photos how did You performed multimode filter mod?
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j.dilisio



Joined: May 19, 2009
Posts: 186
Location: baltimore

PostPosted: Mon Dec 10, 2012 8:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sure, I can post a picture although this picture lays it out pretty clear..
http://www.jhaible.de/hjob8mmf.gif
Here's a photo of Jeurgen's modifications..
http://www.jhaible.de/ob8/jh_ob8_voice.jpg

I'd like to see a photo of your bass boost modification too when you get a chance.
I must be doing something wrong.

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radek tymecki



Joined: Mar 22, 2009
Posts: 76
Location: PL

PostPosted: Tue Dec 11, 2012 1:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

i'll be back in poland in one week i think. now i'm in NL. then i'll take the photos Smile

can u post some audio examples?
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j.dilisio



Joined: May 19, 2009
Posts: 186
Location: baltimore

PostPosted: Thu Dec 13, 2012 10:31 am    Post subject: Reply with quote  Mark this post and the followings unread

I uploaded a few photos of the filter mod here..
http://jdilisio.com/ob8/

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

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j.dilisio



Joined: May 19, 2009
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Location: baltimore

PostPosted: Thu Dec 13, 2012 10:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Here's a demo of the four filter modes. I just calibrated the resonance so that it's a little higher than specified. You'll hear this on the 2-pole and highpass modes.
2-pole > 4-pole > 6dB > highpass

http://jdilisio.com/ob8/OB-8Filters.mp3

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radek tymecki



Joined: Mar 22, 2009
Posts: 76
Location: PL

PostPosted: Sat Dec 15, 2012 2:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

oh man! this shit rocks!

tomorrow i'll try to look after spare 4052 and try to mod ob8!

anyway... i'll keep ya informed in progress!
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j.dilisio



Joined: May 19, 2009
Posts: 186
Location: baltimore

PostPosted: Sat Dec 15, 2012 2:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

Here are a few tips..
-You don't have to cut the traces to the cx21 capacitors. Just cut or desolder the leg leaving enough of the lead so that you can solder a connection to it later.
-It is much easier to make the connection to pin 14 of ux07 before you mount the chip and solder pins 8 and 16.
Good luck.

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radek tymecki



Joined: Mar 22, 2009
Posts: 76
Location: PL

PostPosted: Sat Dec 22, 2012 10:38 am    Post subject: Reply with quote  Mark this post and the followings unread

i've noticed that you dont have to solder a wire to pin 14. you can also solder it info hole after desoldered cap. anyway i'm in a half way. one of 4052's got damaged and i have to buy new one. then i'll be able to finish it Smile

anyway. do you know how to calibrate arpeggiator? mine acts weird. when i press a note - C for example, ob8 arpeggiates it and later changes transposition etc
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radek tymecki



Joined: Mar 22, 2009
Posts: 76
Location: PL

PostPosted: Sat Dec 22, 2012 12:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

i just finished this mod! KICKS ASS!
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j.dilisio



Joined: May 19, 2009
Posts: 186
Location: baltimore

PostPosted: Sun Dec 23, 2012 1:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

Cheers! You should check out the arpeggiator section in the manual. It's pretty complex. You can program up to 5 transpositions.

Post a photo of your bass boost mod when you get a chance.

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radek tymecki



Joined: Mar 22, 2009
Posts: 76
Location: PL

PostPosted: Sun Dec 23, 2012 1:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

tomorrow i'll make hi res pictures. these were made using my cell. anyway as far as i can remember i changed 4 resistors and made a network... another resistor and 47+10 nf cap.

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

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

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



Joined: May 19, 2009
Posts: 186
Location: baltimore

PostPosted: Wed Jan 02, 2013 6:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

I just realized I was using 120ohm resistors instead of 120k Wink
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radek tymecki



Joined: Mar 22, 2009
Posts: 76
Location: PL

PostPosted: Thu Jan 03, 2013 8:10 am    Post subject: Reply with quote  Mark this post and the followings unread

haha Smile good eye man!

is it working for you now?
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radek tymecki



Joined: Mar 22, 2009
Posts: 76
Location: PL

PostPosted: Thu Jan 03, 2013 1:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

ps. do you want to build polymod?
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j.dilisio



Joined: May 19, 2009
Posts: 186
Location: baltimore

PostPosted: Sat Jan 05, 2013 10:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

It's working now! The difference is more subtle than I expected but definitely noticeable.

I'm interested in the polymod but I'd like to hear a sample of how it sounds. I get the feeling I wouldn't have much use for it.

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