Starfighter

Starfighter, 6 months ago

Typst

You can use their online web-editor (similar to OverLeaf for LaTeX) or download the open-source engine and run it locally (there are extensions available for many text editors).

Compared to LaTeX I find it much more comfortable to work with. It comes with sane, modern defaults and doesn’t need any plugins just to generate a (localized) bibliography or include links.

Since Typst is very young compared to LaTeX I’m sure that there are numerous docs / workflows that can’t be reproduced at the moment but if you don’t need some special feature I’d recommend giving it a shot.

Starfighter, 9 months ago

It is my understanding that the ULN2003A (U4 and U5) has integrated flyback diodes. From the datasheet:

Each consists of seven NPN Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads.

Good call on that ground plane. I’ll scoot the relays a little bit to the right. That should resolve the issue.

Thanks for your feedback! :)

Starfighter, 9 months ago

The main reason for splitting up the relays into two sets is that with 10A traces the connector pins would violate minimum separation distances. I would have to get even larger connectors. The ones in the design have 5 mm pitch.

I’m assuming the original board also did this for the same reason although their board is set up for 8 motors split into sets of 4.

I’ve also had some trouble sourcing a 10A fuse suited for inductive loads but I’m sure I could find one with some more time.

The whole board is on its own house circuit fused with a 16A breaker.