I have a barrel jack on my project and wanted a confirmation that 5V and GND are correct. You can see in the image the connections. I guess I can leave 3 unconnected right?
Another question is, I am providing 3.3 V from Raspberry Pi through a header to control an IC but at the sane time using also 5V from an external supply (this is getting on PCB through the Barrel). For the B.CU I made a filled zone with GND. Wondering if it is a good idea (good practice) to have a 5V (or 3.3 V) filled zone on the F.CU
OK, but what is your KiCad question ? this is a KiCad forum not a general electronics forum . . . there are other forums better suited to general electronics questions.
No one can give you that confirmation. The footprints for connectors are one of the most error prone area’s of PCB design. From very small differences in pitch for example 0.6mm and 0.635mm for SOIC, to problems such as this with mapping symbol pins to footprint pads. The only solution is to verify it yourself. Either with the actual connector, or from a datasheet.
In bigger companies, it’s common to have people dedicated to library maintenance for the PCB program. From making custom footprints, to verifying symbols and footprints match (which then go into a verified database), and managing ordering and such.
These days barrel jack power is centre positive so it looks like you will reverse power your circuit and let the magic smoke out of the chips. But don’t you have a multimeter to measure these things? This is nothing to do with PCBs though so consider this bonus information.
Thank you all so much for the replies and the extra info. What was not clear to me was what the symbols mean. Please ignore also the GND label as it comes from another component. So I understand now that the bold line, connector 1 implies the + connection and 2, 3 are GND. I will check with multimeter, I was just thinking of ordering the PCB panelized and wanted to make sure it is compliant with any Barrel Jack. To summarize I have pin 1 connected to 5V and then pins 2 & 3 connected to GND and to each other.
That can never happen. Barrel jacks come in many different sizes, and even when you use the most common (2.1mm / 5.5mm) version, different manufacturers of those barrel jacks have different PCB footprints. If at all possible, you first order the connectors, and then do a test fitting before you order the PCB’s to make sure your combination will work.
Barrel sockets will have to be soldered separately as they are often THT parts and also fairly tall. This will cost you. You’re better off soldering this yourself.
Edit: I incorporated a barrel socket into a recent project. I bought the sockets and measured one with calipers after receiving them, then confirmed that one of the footprints in the standard library matched the sockets I had. And I also measured the voltage on the pins with it connected to a power supply. You should always double check the details if you don’t want to waste time and money manufacturing unworkable boards.
