Toner transfer followed by ferric chloride etch. Most of the tracks are 10 mils with the occasional 15 and 20. It’s just a simple I2C IO expander that’s going to be a part of a very large circuit.
I made [this](https://imgur.com/a/IwlPzQj) pcb using a milling machine, the tracks are all 10 mils and the passives are 0603. There’s also a few ICs that are rather small too. The hardest part was routing everything on a single layer, was a fun puzzle.
I have learned not to make neighboring pin bridges, even if they’re perfectly understood and proper for the circuit, at least on the first revision of a board. Too much hassle in case you need to do some green wiring or other changes. Make it loop out and back, not underneath a package, if you have room.
Toner transfer followed by ferric chloride etch. Most of the tracks are 10 mils with the occasional 15 and 20. It’s just a simple I2C IO expander that’s going to be a part of a very large circuit.
[Reminded me something](https://cdn.shopify.com/s/files/1/1879/3511/files/3_6cda57e3-2cff-4762-8650-d76c3c05bce3.png?v=1538706183)
I made [this](https://imgur.com/a/IwlPzQj) pcb using a milling machine, the tracks are all 10 mils and the passives are 0603. There’s also a few ICs that are rather small too. The hardest part was routing everything on a single layer, was a fun puzzle.
I have learned not to make neighboring pin bridges, even if they’re perfectly understood and proper for the circuit, at least on the first revision of a board. Too much hassle in case you need to do some green wiring or other changes. Make it loop out and back, not underneath a package, if you have room.
Looks quite good. Good job.