Hi
Thank you for all of the replies and thanks Vanepp for the relay fzpz files, they really helped.
I have been experimenting with Fritzing and am making progress. I have found that unless I have a large PCB, the “auto route” function has some problems with the number of connections between the 74HC595 - ULN2803A chips and the 4 relays on each board.
I have had a go at rearranging the components and manually routing the connections in the PCB view; so far it looks ok.
However, because this is my first attempt at designing a PCB I am a little unsure, it would be helpful to hear some views from more experienced people, is it possible to post the file and get some feedback on my design - layout?
Thanks again for the help.
Regards