Thank you to everyone who gave suggestions. I've tried them and found Eagle the best for my needs, so thanks again for the invaluable advice.
I'm now ready to start making my PCB, but I'm having trouble with the photo-resist and developing procedure.
I'm trying to get the correct exposure time by sticking a piece of photo-resist board under my UV lamp and then trying to develop it, increasing exposure time by degrees until the PCB develops. However, it just isn't developing in the solution, even when I can see a remarkable colour change to the photo-resist on the board (if I put something across it, the photo-resist is still green beneath, whereas it's very copper pinkish in exposed areas).
I'm using my wife's face tanning UV thing to expose. It has four UV tubes and I'm using it horizontally held about 3 inches above the board.
I've tried exposure times from 90 secondss to 10 minutes with no luck - I stick the PCB in the developer for just over the recommended 30 seconds and nothing happens, the photo-resist is still in place. The developer is newly bought and mixed correctly today.
I've got no idea about usual exposure times, all I know is what I read on a few sites where proper PCB UV exposure boxes were used, and they said 90 seconds was about enough.
Am I doing something very wrong, can anyone please shed some light on this?
Many thanks again,
James
I'm now ready to start making my PCB, but I'm having trouble with the photo-resist and developing procedure.
I'm trying to get the correct exposure time by sticking a piece of photo-resist board under my UV lamp and then trying to develop it, increasing exposure time by degrees until the PCB develops. However, it just isn't developing in the solution, even when I can see a remarkable colour change to the photo-resist on the board (if I put something across it, the photo-resist is still green beneath, whereas it's very copper pinkish in exposed areas).
I'm using my wife's face tanning UV thing to expose. It has four UV tubes and I'm using it horizontally held about 3 inches above the board.
I've tried exposure times from 90 secondss to 10 minutes with no luck - I stick the PCB in the developer for just over the recommended 30 seconds and nothing happens, the photo-resist is still in place. The developer is newly bought and mixed correctly today.
I've got no idea about usual exposure times, all I know is what I read on a few sites where proper PCB UV exposure boxes were used, and they said 90 seconds was about enough.
Am I doing something very wrong, can anyone please shed some light on this?
Many thanks again,
James