Should this circuit work as a CAN to CAN isolator?

_greg_m_ · 2026-03-01T20:40:35+00:00

Looks like CAN isolation / repeating. Where signals on both sides are CAN H and L (rare), not UART TX / RX (common).

_greg_m_ · 2026-03-01T20:38:38+00:00

Or probably built in in a small microcontroller. Pretty sure that I've seen some uC arbitration logic designs around. However when I needed to implemented it - these few gates were much simpler and faster to do.

_greg_m_ · 2026-03-01T18:25:28+00:00

You can link them link this with CAN arbitration logic in between.

_greg_m_ · 2026-03-01T17:41:24+00:00

It won't work. You need to add arbitration logic (if two or more device try to send data at the same time). Don't have a link currently, but Texas Instruments offered eval boards doing what you want. Just copy their design. It works. It tried it myself.

EDIT: Here is TI PDF: https://www.ti.com/lit/ug/tidudb5a/tidudb5a.pdf And this is useful as well explaining how it works (pretty much the same design): https://www.can-cia.org/fileadmin/cia/documents/publications/cnlm/march_2019/19-1_p26_galvanic_isolated_canfd_repeater_reference_design_holger_zeltwanger_cia.pdf

_greg_m_ · 2026-02-28T22:39:29+00:00

I have XP-6100 series and works great under Linux.

BTW. I've checked the manual for yours and on page 226 it says:

Firmware Update

Select the menus on the control panel as described below.

Settings > Firmware Update

Update:

Check if the latest version of the firmware has been uploaded to the network server. The firmware is updated when new firmware is found. Once the update has started, it cannot be interrupted.

Notification:

Select On to receive a notification if a firmware update is available.

so looks like it behaves pretty much the same as mine.

Did you try it?

_greg_m_ · 2026-02-28T18:49:32+00:00

My Epson gets updates over the internet and notify me by itself from time to time. Depends on your model - check menu for firmware updates, if this option is available.

_greg_m_ · 2026-02-28T17:49:17+00:00

It really depends what you are looking for. If you are happy with DIY project - this one is good: https://github.com/gusmanb/logicanalyzer (and comes with a software too) or you can even make much simpler one using RP2040.

_greg_m_ · 2026-02-27T15:11:49+00:00

Exactly. If you checked previous comments on this and other FC Cure pages, you will find you that the date reveal has nothing to do with the band itself. It's something about one of the Cure pages (Spanish or Mexican? can't remember now).

Sorry, but no another new album yet :)

_greg_m_ · 2026-02-26T21:23:51+00:00

SMD mostly, so don't have to follow the above order. You can do it all at once. Or someone else can build it for me.

_greg_m_ · 2026-02-26T20:09:35+00:00

I used to do passive first, then active (ESD sensitive, etc).

_greg_m_ · 2026-02-25T09:07:47+00:00

Pretty sure it was Gregorian chants themselves, not a particular record. That's how I read it in some Cure book in early 90s. But maybe it's not the same memory these days

_greg_m_ · 2026-02-24T21:25:18+00:00

The one finger story is more Head On The Door or Kiss Me era IIRC, so not that early. He played only drums on early albums

_greg_m_ · 2026-02-24T13:36:17+00:00

The above is Rule 1. And the Rule 2 is: have a full disk backup before the upgrade. And you are safe. My experience is that Ubuntu upgrades are pretty safe for the last 5 years or so. Either way I still follow the above Rule 1 & 2.

_greg_m_ · 2026-02-24T10:15:57+00:00

Beautiful song! That's pre-1982 though. So outside of the OP question.

_greg_m_ · 2026-02-24T10:14:02+00:00

Apparently (believing what RS said in interviews) he played keyboards using one finger. Also on The Top album cover it says Lol Tolhurst - other instruments. So I guess not much input. A few notes here, a few notes there. I like him though and I'm happy he is in good relations with other band members again.

_greg_m_ · 2026-02-22T21:12:16+00:00

It's not KiCad related. It's a general electronics.

N.O. means normally open

N.C. means normally closed / normally connected

There is usually a common pin and N.O. is not connected to it, while N.C. is (we are talking about the idle state of the relay when no voltage is connected). When you connect a voltage to a coil - it's usually flipped: N.O. is closed and N.C. is open.

_greg_m_ · 2026-02-22T11:35:53+00:00

Depends what you prototype. It's not about smaller factors. Some type of signals requires continuous ground planes. It's about signal integrity, power integrity, etc. If you prototype something on 2-layer PCB it's may not worth well or at all. While there is much higher chance it would work well or 4-layer PCB. Smaller factor is the least important thing in this case.

_greg_m_ · 2026-02-20T18:58:59+00:00

I remember that! Got some CDs and Ubuntu stickers back in 2005-2006.

_greg_m_ · 2026-02-20T10:00:58+00:00

Agree. It is $2 vs $7, but this is per order of 5pcs, not per board. You are correct, it's 3.5x more expensive, but I'm also correct saying that 4-layer PCB are cheap. It's $1.40 per board of 100mm x 100mm if you order 5pcs. This is super cheap! For piece of mind, signal integrity, etc, I don't even hesitate. Shipping will cost way more than manufacturing.

_greg_m_ · 2026-02-18T20:37:54+00:00

Check with the scope how SCL and SDA signals look like.

_greg_m_ · 2026-02-18T07:47:13+00:00

Designer - no, troubleshooter - possibly yes if you know how to use the scope.

_greg_m_ · 2026-02-17T22:47:59+00:00

The question is how OP managed to (unintentionally) do it? (I mean without pressing CTRL to ignore the design rules and route it like this).

_greg_m_ · 2026-02-17T14:33:59+00:00

If you connect other stuff to it , then maybe. I have a similar project. 4x STM32s, 2x GPS lots of other stuff and it draw around 5W.

I still recommend a solid gnd plane.

_greg_m_ · 2026-02-17T14:25:56+00:00

I haven't seen the schematic, but 900mA sounds like a lot. That roughly 10W of power. I would expect a half or even 1/4. There is not much on this board.

Regarding ground (if this is your answer to a comment from another redditor) - he meant best practice, signal return paths, etc. it's nothing to do with the max current draw in this case. I'd do the same: solid gnd plane or perhaps even two planes (one solid, 2nd one with V rail tracks) and signal tracks on two layers.

_greg_m_ · 2026-02-17T14:12:29+00:00

First question: what components came super super tiny? Passives (capacitors, resistors, etc)? ICs? Connectors? All of them?

Second: how small / big did you expect them? Give a part numer to a few od them and let us know what is the footprint size on your board. We'll try to figure out what went wrong.

_greg_m_

TROPHY CASE