Does anyone have any advice on routing some high speed signals on flex PCBs? I'm looking at jlcpcb because of the low cost but I'm having difficulty getting impedances to be decent.

My requirements are:

• 45 ohm single ended impedance (maybe? Def doable)
• 90 ohm differential impedance (usb spec)
• 5A current on power pins

But if we look at the capabilities: https://jlcpcb.com/capabilities/flex-pcb-capabilities

• 2 layer
• substrate thickness (PI) = 25 um
• 1 oz pour thickness = 35 um
• min trace width/spacing = 4/4 mil = 0.101/0.101 mm
• ε = 3.3

Is this feasible with this stackup? I'd like to do a 1 oz pour because of power traces, but there's also 0.5 oz (18um) and 0.33 oz (12um).

For the differential signals, when I'm doing impedance calculations, I can get to roughly 70 ohms using W=100um, S=200um. I don't think this is good enough. I think I can get away using a 0.33 oz pour but then I'm worried about the power pins.

And for the power traces, I'm needing 2.2mm, which is reasonable for the pins on a USB-C connector. But if I try using the 0.5 oz or 0.33 oz pour, it gets to be 4.2 mm and 6.3 mm, which seems impossible given the pins are tiny and very closely spaced together. Even with vias to the bottom layer, this seems problematic.

Anyone have any advice here? This is just for a hobby project, so I'm really not looking to change fabs because of costs.

I'm looking to try out i2p but I'm having trouble getting it going.

I have a docker-compose container going with this docker-compose.yml:

version: "3.5"
services:
    i2p:
        image: geti2p/i2p
        ports:
            - 4444:4444
            - 127.0.0.1:6668:6668
            - 7657:7657
            - 54321:12345
            - 54321:12345/udp
        volumes:
            - ./i2pconfig:/i2p/.i2p
            - ./i2ptorrents:/i2psnark
        restart: always
        environment:
            - IP_ADDR=0.0.0.0
            - JVM_XMX=1024m

The container starts up and the log outputs:

$ docker logs i2p-i2p-1 
Starting I2P
[startapp] Running in container
[startapp] setting reachable IP to container IP 0.0.0.0
Starting I2P 2.4.0-0

But when I try to access the console, I'm seeing:

$ curl localhost:7657
curl: (56) Recv failure: Connection reset by peer

Is there anything else that I need to do here?

I'd like some feedback on this community's moderation. Do you feel it's too relaxed? Too strict? Feel free to voice your thoughts in a comment below!

I've tried to be very "hands-off" and mostly let the community decide what's acceptable by voting. I don't usually remove content unless either I receive several reports or if it's a clear violation of the rules/code of conduct. I don't know if this is the best path to take though.

When I came into my office this morning, I found that my boss moved his resin printer into my office and the setup reeks of solvent (it smells like a hundred uncapped expos). Are these fumes fine? Or am I gonna end up with half a melted brain by the end of the week?

This isn't our instance but I'm wondering if we can block the user (bot) spamming this community: https://lemmy.ml/c/clojure

User: https://clj.social/users/planet/

Has anyone had any luck requesting items?

I normally shop at a Costco near my home but my family resides in another part of our state and they go to a different one. I've noticed that their Costco gets way cooler items (jagarico, black thunder candy, like air puffcorn, etc) and I'm tempted to try and request some of them. How do I get these at my store?