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 Forum index » DIY Hardware and Software » Jürgen Haible designs
Trapezoid VCA anybody?
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Would you buy a Jh Trapezoid VCA PCB?
no - only interested in the original EMS circuit (this is not goint to happen - sorry)
2%
 2%  [ 1 ]
yes - if it emulates the behaviour of the EMS circuit, and doesn't need component selecting
97%
 97%  [ 40 ]
Total Votes : 41

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Harry_W



Joined: Dec 01, 2011
Posts: 55
Location: Erlangen/Germany

PostPosted: Mon Jan 23, 2012 10:29 am    Post subject: Reply with quote  Mark this post and the followings unread

emdot_ambient wrote:
I haven't seen anything lately on what's happening with JH's estate. I suspect it will take a while before they figure out what to do with his electronics stuff.


The Haible family recently had to clear the apartment where Jurgen had been living for the last 6-7 months before he died. By agreement with the family, I helped a bit and took all of the unpopulated PCBs to my home (about several hundred pieces). Now I am going to take a kind of inventory, for legal reasons and for giving an overview to the family about Jurgen's "heritage".

Unfortunately, no sales of PCBs or any other modular stuff (there is still the PolyKorg PS-3200 clone left...) will take place until all legal questions are answered. This may take some time. I will see, but I cannot tell you right now if there are Trapezoid PCBs left or not. It's so much stuff...

Regards,
Harry
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Davedatt



Joined: Jan 12, 2012
Posts: 5
Location: Portland OR.

PostPosted: Tue Jan 24, 2012 1:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Please let us know when they are available again. Jurgen did an amazing job of emulation without copying the VCS3. A true genius. BTW folks. The VCA is amazing sounding.

Dave
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MR-808



Joined: Sep 30, 2010
Posts: 28
Location: Portland, OR

PostPosted: Tue Jan 24, 2012 2:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Davedatt wrote:
Little bit concerned about the soft off time, after about 3:00 o'clock I am in a manual time mode. Or at least I got tired of waiting for a re-trigger.


I was able to adjust one of mine to turn on at about 9.75 (out of 10), but the trim was really sensitive around the sweet spot. The other one is about the same as yours, but I think it's due to not having a good 10-turn pot installed. I bet I'll be able to get them to go into manual mode @ 10 once I get some better tweak pots.

Last edited by MR-808 on Tue Jan 24, 2012 2:57 am; edited 1 time in total
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MR-808



Joined: Sep 30, 2010
Posts: 28
Location: Portland, OR

PostPosted: Tue Jan 24, 2012 2:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Oh, BTW, here's a pic of the panel Dave & I cooked up, with some MOTM panels for comparison. The alignment of the bottom jacks is a little off, the "VCA IN 2" should be "VCA CV", the "TG SHIFT" should be scaled -5 to +5, and the "AUDIO TRIGGER" should be "SWITCH TRIGGER". Oh, and the black paint isn't quite as black as the MOTM paint. It ain't perfect, but I'm pretty darned happy with it. Please cut us some slack - it's our very first custom panel! ;)


TZG.JPG
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TZG.JPG


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vtl5c3



Joined: Sep 08, 2006
Posts: 423
Location: PDX
Audio files: 13

PostPosted: Tue Jan 24, 2012 9:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Looks really nice!
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emdot_ambient



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

PostPosted: Tue Jan 24, 2012 11:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, it looks pretty awesome!

Do you have an electronic version of the front panel design of it you could share? It looks like a good jumping off point for the ones I'll eventually build (I've got 2 in my inventory).

_________________
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MR-808



Joined: Sep 30, 2010
Posts: 28
Location: Portland, OR

PostPosted: Tue Jan 24, 2012 7:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks! Here's an FPD with the legends fixed - hope it's useful!


Trapezoid Generator revised.fpd
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emdot_ambient



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

PostPosted: Wed Jan 25, 2012 2:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

Cool, thanks! I'll end up messing around with it to suit my needs but this'll really help. Cheers!
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chrisp



Joined: Jan 14, 2010
Posts: 6
Location: Athens,Greece

PostPosted: Wed May 07, 2014 10:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

could someone help me with this project.....?

the trapezoid don't do anything.

the led is always on, and only the trapezoid pot working

have anyone the same symptoms?

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chrisp



Joined: Jan 14, 2010
Posts: 6
Location: Athens,Greece

PostPosted: Fri Jun 13, 2014 1:52 am    Post subject: Reply with quote  Mark this post and the followings unread

OK finally I found the problem!!! The main problem it was a bad soldering at D5 but on the way i found also and on other parts the same problems.

now I 'm on trimming stage

Many thanks to Dave Brown for his help and the mathematical description !!
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