# What is this schematic symbol please? **URL:** \ **Category:** DIY STUFF\ **Created:** [August 17, 2021, 5:58am UTC](https://lookmumnocomputer.discourse.group/t/what-is-this-schematic-symbol-please/3897 "2021-08-17T05:58:46Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![popflier](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/popflier/32/80_2.png) [@popflier](https://lookmumnocomputer.discourse.group/u/popflier)\ **Post date:** [August 17, 2021, 5:58am UTC](https://lookmumnocomputer.discourse.group/t/what-is-this-schematic-symbol-please/3897/1 "2021-08-17T05:58:46Z")
Can someone please tell me what this schematic symbol is? I thought maybe it was a polyfuse or a variable potentiometer but I can’t find anything in kicad like this that has 3 points to connect to. ![InkedAudio_S_R_schematic_LI](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/d/7/d7386867de8868d1fb4be4a2671766e59608ee45.jpeg) ---
**Author:** ![TimMJN](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/timmjn/32/15227_2.png) [@TimMJN](https://lookmumnocomputer.discourse.group/u/TimMJN)\ **Post date:** [August 17, 2021, 6:16am UTC](https://lookmumnocomputer.discourse.group/t/what-is-this-schematic-symbol-please/3897/2 "2021-08-17T06:16:12Z")
That’s a trim pot! Though judging from this schematic, it’s used as a regular potentiometer. ---
**Author:** ![twinturbo](https://avatars.discourse-cdn.com/v4/letter/t/8baadc/32.png) [@twinturbo](https://lookmumnocomputer.discourse.group/u/twinturbo)\ **Post date:** [August 17, 2021, 8:48am UTC](https://lookmumnocomputer.discourse.group/t/what-is-this-schematic-symbol-please/3897/3 "2021-08-17T08:48:46Z")
R\_POT\_TRIM is what is in Kicad ---
**Author:** ![popflier](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/popflier/32/80_2.png) [@popflier](https://lookmumnocomputer.discourse.group/u/popflier)\ **Post date:** [August 18, 2021, 5:31am UTC](https://lookmumnocomputer.discourse.group/t/what-is-this-schematic-symbol-please/3897/4 "2021-08-18T05:31:54Z")
I am not seeing any other potentiometer in this schematic so I think that you’re right @TimMJN in that they are using this as a regular potentiometer since I know this circuit has 2 potentiometers in it. I just have never seen one with 3 connection points and the arrow like this before. @twinturbo I did look up the R\_POT\_TRIM in kicad (see image) but it doesn’t look anything like this other symbol. So it’s confusing to me. How would I connect these to this trim potentiometer symbol? Would I connect the numbers listed in green on the image to the numbers in the symbol? ![InkedScreenshot 2021-08-17 23.25.08_LI](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/d/6/d66a516849f4b98d6486511ffeb48b3336dc4865.jpeg) ---
**Author:** ![TimMJN](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/timmjn/32/15227_2.png) [@TimMJN](https://lookmumnocomputer.discourse.group/u/TimMJN)\ **Post date:** [August 18, 2021, 5:34am UTC](https://lookmumnocomputer.discourse.group/t/what-is-this-schematic-symbol-please/3897/5 "2021-08-18T05:34:45Z")
> [@popflier](#): > > How would I connect these to this trim potentiometer symbol? Would I connect the numbers listed in green on the image to the numbers in the symbol? Since this is an attenuator, the other way around. Pin 1 on the potentiometer symbol is the fully counterclockwise or 0 position. So you want that one to connect to GND. Cheers! ---
**Author:** ![popflier](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/popflier/32/80_2.png) [@popflier](https://lookmumnocomputer.discourse.group/u/popflier)\ **Post date:** [August 18, 2021, 5:41am UTC](https://lookmumnocomputer.discourse.group/t/what-is-this-schematic-symbol-please/3897/6 "2021-08-18T05:41:27Z")
Are you saying like this then? ![InkedScreenshot 2021-08-17 23.25.08_LI2](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/b/5/b5c83aecb250a682d5c46239a3fdbe4513f17905.jpeg) ---
**Author:** ![TimMJN](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/timmjn/32/15227_2.png) [@TimMJN](https://lookmumnocomputer.discourse.group/u/TimMJN)\ **Post date:** [August 18, 2021, 5:42am UTC](https://lookmumnocomputer.discourse.group/t/what-is-this-schematic-symbol-please/3897/7 "2021-08-18T05:42:30Z")
Yep, looks good to me! ---
**Author:** ![popflier](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/popflier/32/80_2.png) [@popflier](https://lookmumnocomputer.discourse.group/u/popflier)\ **Post date:** [August 18, 2021, 5:48am UTC](https://lookmumnocomputer.discourse.group/t/what-is-this-schematic-symbol-please/3897/8 "2021-08-18T05:48:14Z")
Great! Thank you Tim! 🙂 ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [August 18, 2021, 8:00am UTC](https://lookmumnocomputer.discourse.group/t/what-is-this-schematic-symbol-please/3897/9 "2021-08-18T08:00:42Z")
> [@Schematics (understanding and drawing them)](https://lookmumnocomputer.discourse.group/t/schematics-understanding-and-drawing-them/1011/25): > > To enrich the [Glossary](https://lookmumnocomputer.discourse.group/t/glossary-wiki/528) links a little Potentiometer : > [@Schematics (understanding and drawing them)](https://lookmumnocomputer.discourse.group/t/schematics-understanding-and-drawing-them/1011/29): > > It’s the symbol for a “variable resistor,” which (for low power requirements (\*)) is realized as a potentiometer with one lead connected to the wiper and the other to one of the ends. It’s common to connect the wiper to the other end while you’re at it: but that’s mostly to avoid dangling leads (and if you use PCB-mounted potentiometers, you want to solder all pins for physical stability). (in this circuit, the resistance controls how quickly the 2.2u capacitor discharges) \*) EDIT:…