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 Forum index » DIY Hardware and Software » YuSynth
Min/Max inconsistencies
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roglok



Joined: Aug 28, 2010
Posts: 159
Location: uptown

PostPosted: Wed Oct 03, 2012 5:20 am    Post subject: Min/Max inconsistencies Reply with quote  Mark this post and the followings unread

Hi Yves,

I am planning to build your Min/Max processor, but I have noticed some inconsistencies. R16 and R37 are labelled as 50K in the schematics, but 100K on the board and in the BOM. Which is correct? Also, will this run on +/-12V without changes?

Many thanks!
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wmonk



Joined: Sep 15, 2008
Posts: 486
Location: Enschede, the Netherlands
Audio files: 13

PostPosted: Wed Oct 03, 2012 10:43 am    Post subject: Reply with quote  Mark this post and the followings unread

There are two parallel 100K resistors on the boards. So you can either insert one 50K, or two 100K in parallel (means it makes a resistor of 50K).
See also the note on the YuSynth page.

http://yusynth.net/Modular/EN/MINMAX/index.html

Cheers,
Woody

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roglok



Joined: Aug 28, 2010
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PostPosted: Wed Oct 03, 2012 12:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Woody. I did read the notes and I'm aware of the parallel resistor trick. However, the BOM lists six 50K resistors, in the schematics it's a total of eight.

I'm specifically referring to R16 and R37. If you look closely at the component layout image, you'll notice that R16 and R37 are only a single 100K, not two in parallel...


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yusynth



Joined: Nov 24, 2005
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PostPosted: Wed Oct 03, 2012 1:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes the second 100K (in parallel) must be soldered under the PCB (track side).
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roglok



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PostPosted: Thu Oct 04, 2012 2:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Yves!

I've built a single version on stripboard. Works like a charm on 12V. I have not normalised the inputs to GND since my jacks are not switched. However, the positive and negative rectification still works well with the second input floating. Is there a specific reason why you are grounding them or just to be safe from eventual bleed/crosstalk?

Thank Yu for sharing this great little circuit! respect
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yusynth



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PostPosted: Thu Oct 04, 2012 4:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes it's just for security.
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roglok



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PostPosted: Thu Oct 04, 2012 5:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Ok, cool! So I'm going to keep the wires short... Very Happy
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marfoski



Joined: Jan 26, 2011
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PostPosted: Thu Oct 04, 2012 5:52 am    Post subject: Reply with quote  Mark this post and the followings unread

yusynth wrote:
Yes the second 100K (in parallel) must be soldered under the PCB (track side).


Yves,
I wonder if that makes any difference. I've built this module without those supplemental resistors (and I believe that many others did just the same) and I didn't notice anything wrong.
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yusynth



Joined: Nov 24, 2005
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PostPosted: Thu Oct 04, 2012 7:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes it makes a difference if you want to have a true min/max function and if you use this module to combine CVs it can be annoying but if you use only this module to produce distorsions in sound this not really important
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marfoski



Joined: Jan 26, 2011
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PostPosted: Thu Oct 04, 2012 10:06 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you, Yves!
Honestly, until now I've used the module only for audio, so your explanation is welcome. I've just done the mod and it works flawlessly. Perhaps it would be worth to amend your site accordingly. Anyway we're all in debt with you for your splendid work. Very Happy
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roglok



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PostPosted: Thu Oct 04, 2012 10:09 am    Post subject: Reply with quote  Mark this post and the followings unread

marfoski wrote:
Anyway we're all in debt with you for your splendid work. Very Happy


Ohm...
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yusynth



Joined: Nov 24, 2005
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PostPosted: Thu Oct 04, 2012 4:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yes I should amend this page and I will asap.
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