Min/Max inconsistencies

roglok · Joined: Aug 28, 2010 Posts: 125 Location: uptown

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!

wmonk · Posted: Wed Oct 03, 2012 10:43 am Post subject:

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

roglok · Joined: Aug 28, 2010 Posts: 125 Location: uptown

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...

yusynth_minmax_comp_layout.jpg

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yusynth · Joined: Nov 24, 2005 Posts: 1166 Location: France

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

roglok · Joined: Aug 28, 2010 Posts: 125 Location: uptown

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

yusynth · Joined: Nov 24, 2005 Posts: 1166 Location: France

Yes it's just for security.

roglok · Joined: Aug 28, 2010 Posts: 125 Location: uptown

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

marfoski · Joined: Jan 26, 2011 Posts: 18 Location: Italy

yusynth · Joined: Nov 24, 2005 Posts: 1166 Location: France

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

marfoski · Joined: Jan 26, 2011 Posts: 18 Location: Italy

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

roglok · Joined: Aug 28, 2010 Posts: 125 Location: uptown

yusynth · Joined: Nov 24, 2005 Posts: 1166 Location: France

Yes I should amend this page and I will asap.