# Analog Output Attenuverters

**URL:** <https://lookmumnocomputer.discourse.group/t/analog-output-attenuverters/4821>\
**Category:** DIY STUFF\
**Created:** [March 27, 2022, 12:15am UTC](https://lookmumnocomputer.discourse.group/t/analog-output-attenuverters/4821 "2022-03-27T00:15:44Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\
**Post date:** [March 27, 2022, 12:15am UTC](https://lookmumnocomputer.discourse.group/t/analog-output-attenuverters/4821/1 "2022-03-27T00:15:44Z")

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This is a Kosmo format attenuverters module. Not much to say beyond that! There are three attenuverters. One has a switch to select 10 V input instead of the input jack. There are jacks for output of the sum and inverted sum of the three channels. Response to slider position is nonlinear, giving you finer control near the middle for setting small values.

Schematics, KiCad design files, Gerbers, docs here:

> **[GitHub - holmesrichards/attenuverters: Kosmo format attenuverters synth module](https://github.com/holmesrichards/attenuverters)**
>
> Kosmo format attenuverters synth module. Contribute to holmesrichards/attenuverters development by creating an account on GitHub.

 ![PXL_20220326_225457397.PORTRAIT](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/2/e/2ef05af796b6f9a5bdd71a2e0d9f701f4ad84cd3.jpeg)  
 ![PXL_20220326_232013945.PORTRAIT](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/3/d/3d9c94b528f55b53926649f6849e09caf62947ab.jpeg)

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**Author:** ![devicex](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/devicex/32/28_2.png) [@devicex](https://lookmumnocomputer.discourse.group/u/devicex)\
**Post date:** [March 27, 2022, 1:39am UTC](https://lookmumnocomputer.discourse.group/t/analog-output-attenuverters/4821/2 "2022-03-27T01:39:51Z")

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nice , you know if you have extras I am interested have to and to my Analog output rack 😉  
and as soon as I have some cash thanks to your YT video on ordering pcb’s I will give it a go .

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**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\
**Post date:** [March 27, 2022, 1:57am UTC](https://lookmumnocomputer.discourse.group/t/analog-output-attenuverters/4821/3 "2022-03-27T01:57:21Z")

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Yeah, I’ll have a few extras up on Tindie at some point.

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**Author:** ![d42kn355](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/d42kn355/32/273_2.png) [@d42kn355](https://lookmumnocomputer.discourse.group/u/d42kn355)\
**Post date:** [March 27, 2022, 3:54am UTC](https://lookmumnocomputer.discourse.group/t/analog-output-attenuverters/4821/4 "2022-03-27T03:54:55Z")

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I just wanna say @analogoutput - you have such beautifully clean schematics.  
🙂

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**Author:** ![antoine.pasde2](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/antoine.pasde2/32/326_2.png) [@antoine.pasde2](https://lookmumnocomputer.discourse.group/u/antoine.pasde2)\
**Post date:** [March 29, 2022, 5:39am UTC](https://lookmumnocomputer.discourse.group/t/analog-output-attenuverters/4821/5 "2022-03-29T05:39:33Z")

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Why don’t you use switched jacks and have all the inputs normaled to +10V ?

Edit: just saw your comment on the schematic. When completely attenuated a normaled input shouldn’t be a problem.

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<div class="post-metadata">

**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\
**Post date:** [March 29, 2022, 12:04pm UTC](https://lookmumnocomputer.discourse.group/t/analog-output-attenuverters/4821/6 "2022-03-29T12:04:55Z")

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A matter of preference of course. I just thought it seemed a cleaner user interface than having to remember to carefully center the slider on any channel not in use.

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<div class="post-metadata">

**Author:** ![antoine.pasde2](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/antoine.pasde2/32/326_2.png) [@antoine.pasde2](https://lookmumnocomputer.discourse.group/u/antoine.pasde2)\
**Post date:** [March 29, 2022, 4:12pm UTC](https://lookmumnocomputer.discourse.group/t/analog-output-attenuverters/4821/7 "2022-03-29T16:12:20Z")

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While trying to figure out how you achieve the higher precision towards zero, I noticed that on the PDF schematic there are two OUTSUM and two OUTSUM\_P but no OUTSUM\_N. That doesn’t seem right.  
I don’t know if the KiCad schematic is different as I am on my phone.

Edit: nevermind, I just saw the negating bar. Sorry I need more coffee.