# CEM3340/AS3340 - POT question

**URL:** <https://lookmumnocomputer.discourse.group/t/cem3340-as3340-pot-question/602>\
**Category:** DIY STUFF\
**Created:** [April 12, 2020, 4:54pm UTC](https://lookmumnocomputer.discourse.group/t/cem3340-as3340-pot-question/602 "2020-04-12T16:54:00Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![fredrik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/fredrik/32/682_2.png) [@fredrik](https://lookmumnocomputer.discourse.group/u/fredrik)\
**Post date:** [April 12, 2020, 11:24pm UTC](https://lookmumnocomputer.discourse.group/t/cem3340-as3340-pot-question/602/15 "2020-04-12T23:24:52Z")

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Ok, looked at various LMNC schematics and the stripboard one does indeed leave it unconnected, the #1222 performance one uses proper voltage dividers (centre note is 0-12 V, fine tune is 0-1 V) and the Fartbox has a switch between GND and unconnected!? Hmm, need to go look at that PCB, I think.

EDIT: Turns out the switch is what’s called “sphnc tight/loose” on the Fartbox, or robot (🤖) vs. human (🧔) according to the video. The stripboard is a bit more sanitized, and calls it “low end on/off” which is pretty much what it does – as you move from unconnected to GND, and on to −12 V, the further down you can tune things with this control. Your choice 😃

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