# 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:** 1\ **Showing post:** 9
**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:… --- _[View the full topic](https://lookmumnocomputer.discourse.group/t/what-is-this-schematic-symbol-please/3897)._