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 Forum index » DIY Hardware and Software » Klee sequencer
Klee Calibration Problem
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roborobert



Joined: Jan 15, 2013
Posts: 24
Location: austria

PostPosted: Sun Nov 03, 2013 5:39 am    Post subject: Klee Calibration Problem
Subject description: i'm getting only negative voltages on Pin1 U8
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Hey there,

i'm quite puzzled.
after having some great hours with my finished and nicely working klee i went back to the workbench to do the last bits and pieces...

adjusting R42 and R43 for 0V worked nicely. good.

while trying to adjust R34 - R38 for the desired 0,333V etc. i found that i'm only getting negative voltages... on each of the 8 stages - right voltage wrong polarity.
on the programming pots as well as on the voltage outputs, they show up positive again. so it seems i don't have a problem anymore... or do i?

did i maybe overread some important sentence like 'ignore the minus on your dvm' in a haste?

by the way - on first startup, i had a pair of Motorola MC14034BP inserted - they showed some flickering leds and then died, getting hot and smelling like burnt electronics - so i got a some CD4034BP from futurlec and then only had to solve the R20 inserted in the via instead of proper hole problem - from then on everything runs nicely.
maybe this is important.

many thanks for this great sequencer!
best wishes, rob
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eXisteNz



Joined: Jun 08, 2010
Posts: 48
Location: Italy

PostPosted: Sun May 04, 2014 4:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Hey do you worked it out? I'm experiencing your similar issue, i read only negative volage and if i try to rotate trimpot to reach positive voltage a then i Can reach only until -0,06 or -0,16...
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roborobert



Joined: Jan 15, 2013
Posts: 24
Location: austria

PostPosted: Tue May 06, 2014 7:10 am    Post subject: Reply with quote  Mark this post and the followings unread

no, i wasn't able to solve the problem.
i didn't care about the minus anymore since the outputs are performing as they should (positive voltages in the right range)
but i also still have problems reaching the right voltages on the scaled outputs - guess i have to change some corresponding resistor values (which is properly documented), but didn't get to it...

best, r
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elmegil



Joined: Mar 20, 2012
Posts: 2177
Location: Chicago
Audio files: 16

PostPosted: Tue May 06, 2014 9:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Actually the fact is the voltages are supposed to be negative. Threw me the first one I built too.
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eXisteNz



Joined: Jun 08, 2010
Posts: 48
Location: Italy

PostPosted: Tue May 06, 2014 11:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yeah while i was reading some of The Scott posts, he said that although The manual refer this voltages ad they're positive, these are NEGATIVE. It's an error. In fact it works fine! Smile
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roborobert



Joined: Jan 15, 2013
Posts: 24
Location: austria

PostPosted: Wed May 07, 2014 4:52 am    Post subject: Reply with quote  Mark this post and the followings unread

aha! good to know
do you remember where you found that post? not that it's so important, but maybe there's some more i havent figured out yet...

best,R
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eXisteNz



Joined: Jun 08, 2010
Posts: 48
Location: Italy

PostPosted: Wed May 07, 2014 5:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Oh well, Now i can't remember exactly, but i found it while i was searching for "calibration issues"...maybe it was on muffwiggler? I really can't remember! Sad
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roborobert



Joined: Jan 15, 2013
Posts: 24
Location: austria

PostPosted: Wed May 07, 2014 6:13 am    Post subject: Reply with quote  Mark this post and the followings unread

ok, thanks Smile
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jksuperstar



Joined: Aug 20, 2004
Posts: 2503
Location: Denver
Audio files: 1
G2 patch files: 18

PostPosted: Sun Jan 04, 2015 4:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

I just had this same "problem"...thankful this thread exists. I did have to trace through the schematics to realize there was a double inversion in the amplifier path.

Still, I ended up doing the calibration at Analog board J13, Pin 5 (the CV output for A). Positive voltage, and it accounts for the opamp after U8 called for in the calibration sequence.
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eXisteNz



Joined: Jun 08, 2010
Posts: 48
Location: Italy

PostPosted: Mon Jan 05, 2015 1:38 am    Post subject: Reply with quote  Mark this post and the followings unread

Good to know you found it useful, Smile have fun !!!
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sduck



Joined: Dec 16, 2007
Posts: 459
Location: Nashville
Audio files: 5

PostPosted: Thu Jan 08, 2015 7:38 am    Post subject: Reply with quote  Mark this post and the followings unread

It's all probably in the Build and Applications thread stickied above this. Yes, it's a large and daunting thread, but covers a lot of stuff, and is where questions like this should go also. I read the whole thing when I built mine, and keep up with it since then.
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