Nat needed a PCB recently, so we decided to see if we could make good use of the PCB etching equipment we have in the hackspace. It’s a fairly simple process, print a positive on some laser-printer-acetate, stick it to a pre-sensitised PCB, expose it to UV, dip it in developer, then dip it in etchant.
At least, we thought it was that simple. We had a couple of failed attempts before we got a good board. We couldn’t agree on the correct time for exposure and development. On our third attempt, with two minutes in the light box and about thirty seconds in the developer solution, we got a decent image.
Now we really should have rubber gloves for this next bit, but we couldn’t find any. Fortunately we did have a pair of thick plastic carrier bags for handling the etching chemicals.
After allowing plenty of time in the etchant, agitating it for extra speed, we finally got a good looking PCB out.
Some of the tracks needed a little bit of fixing up afterwards, but this was just a quick test board. If this works, there will be two more done properly.
Now that we know how best to use the kit we have, if you have a project that requires a home-made PCB then why not come along and let us lend a hand?