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 Forum index » DIY Hardware and Software » Jürgen Haible designs
Living VCOs
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Would you prefer one PCB with 3 VCOs a la JH-5A, or 1 VCO per PCB with more features
One PCB with Oscillator Driver and 3 VCO cores (like JH-5A - cheap!)
60%
 60%  [ 62 ]
1 PCB = 1 VCO (with many waveforms and inputs)
39%
 39%  [ 40 ]
Total Votes : 102

Author Message
saint gillis



Joined: Apr 21, 2012
Posts: 53
Location: Brussels

PostPosted: Thu Jun 07, 2012 6:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanx for your precious help! Although the result seems very satisfying I m sure it can be tweaked again by really qualified people, I ll tell you if I see collateral damages using syncro Smile
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saint gillis



Joined: Apr 21, 2012
Posts: 53
Location: Brussels

PostPosted: Sun Jul 08, 2012 9:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hello!
Just to tell that I m using it very often and it really works very well! Very Happy
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bennethos



Joined: Apr 18, 2009
Posts: 31
Location: Belgium

PostPosted: Mon Dec 31, 2012 8:09 am    Post subject: waveshaper Reply with quote  Mark this post and the followings unread

Hey guys,

I would like to include some other waveshapes besides the default Pulse & saw.

Which one would you guys consider ?

thx
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saint gillis



Joined: Apr 21, 2012
Posts: 53
Location: Brussels

PostPosted: Tue Jan 01, 2013 7:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello! I've not tried myself to add waveforms, but maybe you can find some great infos on Bill & Will's page, if you haven't seen it before..
http://www.dragonflyalley.com/constructionJHLivingVCO.htm
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The Peasant



Joined: Nov 13, 2009
Posts: 90
Location: Sunny Alberta
Audio files: 1

PostPosted: Tue Jan 01, 2013 11:16 am    Post subject: Reply with quote  Mark this post and the followings unread

There is a schematic for adding triangle and sine outputs on page 12 of this thread and a stripboard layout for that on page 17.

Take care,
Doug

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The Bad Producer



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

PostPosted: Tue Jan 01, 2013 3:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

I added that circuit (thanks Peasant!) and it works really well, couldn't imagine the VCO's without the other waves!
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MarcMooga



Joined: Jan 31, 2013
Posts: 1
Location: Bremen

PostPosted: Thu Jan 31, 2013 6:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi,

I am also about to finish the great sounding Living VCOs and I would like to add that Hard Sync feature.

My knowledge level is limited, but I am trying to improve day by day.
Here is my drawing... it would be great if anybody can confirm:

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

Thank you! Smile

regards,
Marc
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saint gillis



Joined: Apr 21, 2012
Posts: 53
Location: Brussels

PostPosted: Wed Feb 13, 2013 3:35 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello Marc!
I don't have an original PCB made by the great Jurgen himself so I can't check myself if everything is correct, but it looks like there is a mistake where I ve put a red cross :
Posted Image, might have been reduced in size. Click Image to view fullscreen.

This part of the additional circuit should be connected on R20 resistor as you can see here (not on IC3's pin2) :

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



Joined: May 18, 2012
Posts: 6
Location: Santa Cruz, CA

PostPosted: Sat May 18, 2013 2:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

Any news about the availability of PCBs for this project? I'm very eager to build one.
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sonicwarrior



Joined: Dec 22, 2005
Posts: 227
Location: Cologne, Germany

PostPosted: Sun May 19, 2013 2:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Nope, the existing PCB's can't be sold due to legal issues that are still unsolved.
=> http://electro-music.com/forum/post-369475.html#369475
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Luka



Joined: Jun 29, 2007
Posts: 1002
Location: Melb.

PostPosted: Tue May 21, 2013 3:26 am    Post subject: Reply with quote  Mark this post and the followings unread

there is a veroboard layout for it here

http://electro-music.com/forum/topic-56066.html

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bIG joB heAd



Joined: Jul 11, 2013
Posts: 1
Location: France

PostPosted: Thu Jul 11, 2013 5:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello,
i bought a filled PCB of a living VCO a few days ago.
I did the modifications to power it in +/-12V and it works like a charm and now i'd like to add the waveshapers but i'm a little confused about a few things.
As i understand, the waveshapers have an amp stage for each waveform so i can plug the outputs jacks directly there and use the spare amps on the driver section to amplify the pulse out.
Do i need to change some resistor values to adapt the waveshapers to 12V?
Thanks for any help Wink
Flavien
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evengravy



Joined: Aug 10, 2013
Posts: 2
Location: ireland

PostPosted: Sat Aug 10, 2013 4:10 am    Post subject: schematic error? Reply with quote  Mark this post and the followings unread

The schematic shows R40 trimmer referenced to +vb (+15v) and -vb (-15v) but the reference designator clearly has it referenced to GND and not -vb

can someone with more knowledge than I help? I'd like to build it on stipboard but the layout is also referenced to -vb and I cant be sure it's correct


R40 GND.jpg
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R40 GND.jpg


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sduck



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

PostPosted: Sat Aug 10, 2013 6:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

On the actual pcb, those connections are to ground, not -v
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evengravy



Joined: Aug 10, 2013
Posts: 2
Location: ireland

PostPosted: Sun Aug 11, 2013 10:34 am    Post subject: thanks Reply with quote  Mark this post and the followings unread

Thanks a lot for clearing that up, think I've got it cracked now can't wait to try it out!
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oldenjon



Joined: May 18, 2012
Posts: 6
Location: Santa Cruz, CA

PostPosted: Fri Aug 23, 2013 1:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

Does anyone know if keeping the values of all resistors at 1% tolerance is critical in this circuit? Aside from the matched resistors of course.
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