Thanks for that Nigel, I'm gonna go with the 9v batteries for now, dont wanna start messing with mains power when I dont understand it properly.
Just wanna check a few values on parts as I cant get the exact ones mentioned in the schedule.
The bridge recitifer, you said I can do without it, but i'd still prefer to put something in there. Closest I seem to be able to get is a 100V 1A one (1B4B42 DIL 1A). Is this suitable and does it effect any other parts? Is this recitifer basically doing what the 1N4004 diodes seem to do in other designs?
With the voltage regulators, 78L05 is cool, I can get that at 100mA. For the 78L08 though, closest I can get is 7808, which is the 1A version. If I understand correctly this shouldnt matter though, it just means it can regulate the voltage up to 1A current, is that right?
I think probably the most confusing part is the capacitors. There are just so many types and values for the damn things.
If I go with the Electrolytic RB I can get a 220uF at 50V.
For the 100nF (or 0.1uF) I'm a bit stuck on what to get. I can get a 'greencap' at 100vdc, a 50vdc monolithic, a 35v tantalum, or a 50v RBLL low leakage electrolytic. Dont really understand the differences with these, there are too many .
I think thats just about it.. All help is appreciated
Lee