Electronics > KiCad

Trimmer resistors pin not connected?

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Doctorandus_P:

--- Quote from: Benta on August 20, 2023, 09:08:09 pm ---Guys, you are into practical implementation again.
This about schematic symbols.

--- End quote ---

Huh?
Schematic symbols do not live in a vacuum. And besides, from the opening post:


--- Quote from: Moriambar on August 20, 2023, 09:30:05 am ---When I'm going to the pcb though, I have this worrysome warning:
...  And in fact I have no connection for Pin 3, making my trimpot useless, I guess.

--- End quote ---

And the "missing" connection for pin 3 is also from a PCB footprint.

https://xkcd.com/386/

Moriambar:
Guys I basically checked my chosen PCB footprint and the component datasheet: everything is fine and dandy.
Pin 1 is connected and pin 2 is connected too (wiper). I know it's best practice to connect the wiper with one of the other pins, but I don't care, the important thing is that it IS a trimpot and resistance will be trimmed.

OTOH: is there a way to connect the third pin to the wiper for good measure without changing the schematic?

Thanks!

langwadt:

--- Quote from: Moriambar on August 21, 2023, 06:13:36 am ---Guys I basically checked my chosen PCB footprint and the component datasheet: everything is fine and dandy.
Pin 1 is connected and pin 2 is connected too (wiper). I know it's best practice to connect the wiper with one of the other pins, but I don't care, the important thing is that it IS a trimpot and resistance will be trimmed.

OTOH: is there a way to connect the third pin to the wiper for good measure without changing the schematic?

Thanks!

--- End quote ---

you can make a copy of the foot print and change pin3 to also be pin2

Moriambar:

--- Quote from: langwadt on August 21, 2023, 06:41:29 am ---
--- Quote from: Moriambar on August 21, 2023, 06:13:36 am ---Guys I basically checked my chosen PCB footprint and the component datasheet: everything is fine and dandy.
Pin 1 is connected and pin 2 is connected too (wiper). I know it's best practice to connect the wiper with one of the other pins, but I don't care, the important thing is that it IS a trimpot and resistance will be trimmed.

OTOH: is there a way to connect the third pin to the wiper for good measure without changing the schematic?

Thanks!

--- End quote ---

you can make a copy of the foot print and change pin3 to also be pin2

--- End quote ---

Wow, nice and simple. I would've never thought about it, thanks!

John B:
Kicad doesn't have every part you need. I would create a schematic symbol and footprint pair and name them accordingly so you know what part they match.

I would only change the footprint so that pads/plated holes have the same number if they are electrically connected.

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