Re: First PCB


"ehsjr" <ehsjr@xxxxxxxxxxxxxxxx> wrote in message
news:RUyIf.6703$lG.2639@xxxxxxxxxxx
Abstract Dissonance wrote:
This is my first PCB,

http://www.geocities.com/abstract_dissonance/untitled.pdf

The first page is in color with some reference blocks I used so I knew
what components were what... the second is only the copper.

Anyone have any suggestions? I had to cram a lot of crap, IMO, into a
small space... much more than I wanted to but I didn't have much of a
choice.

Basicaly contains a dual split regulated power supply with a +12 and +5
fixed (that will be used to run another pcb board and a fan and for
general use).

V+ is the 317 and V- is the 337 while the 12 and 5 are the 78MXX series.
(I actually don't have a +5 ;/ I might have to try to fit a resistor in
there some how and use an LM317 as a fixed 5 ;/)

Anyways. The main thing I'm after is how the overall pcb design is... if
there are any major problems that I should not do that is obvious to
someone with more experience. Unfortunately(or maybe fortunately) I had
to "draw" all the stuff by hand so it was kinda tough. I tried to use
those "automated" programs but it seemed like more of a hassle for a
simple job.

Two notes, the larger pads are either for the variable resistors or
input/output... except for the one next to the cap in the center which is
actually used for another cap that will be sitting on top of the first
cap and I will run some wires down to those pads... just didn't have
enough room(I think) to do all that with another large 1in cap in there.
I also didn't use any vias or jumpers cause I didn't really needed them
and thought it would look messy(although it would have been nice to get
all my outputs grouped together but its impossible the way I have it.

Thanks,
Jon

Drilling: a dremel in a drill press made for
the Dremel and ball end dental burrs. The
burrs are *vastly* superior to drill bits.


Are these the little drill bit like things that have different shapes at the
end and look like iron bits or something?

I was thinking about trying to do it by hand at first and see how that went
;/ Then try to make a simple press... and then order one later.




Etching: do *not* get ferric cloride on anything.
It *will* stain. Agitate while etching and keep
the solution warm with a hot plate. If you are
going to do a lot more in thr future, get an etching
tank made for the purpose that has a heater and an
air bubbler.


I got that. I made a glass tank that has a heater and bubbler in it. I
tried to make it thin so I wouldn't have to use so much etchant in it to do
smaller boards.. Not as thin as I like but hopefully will do the job.


Ed

Thanks,
Jon


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