Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Steve" <alienrelics@y...> 
wrote:
> --- In Homebrew_PCBs@yahoogroups.com, "kaytea2k" <kaytea2k@y...> 
wrote:
> > --- In Homebrew_PCBs@yahoogroups.com, "Dave Mucha" 
<dave_mucha@y...> 
> > wrote:
> > > --- In Homebrew_PCBs@yahoogroups.com, "kaytea2k" 
<kaytea2k@y...> 
> > > wrote:
> > > > Anyone up for making a simple PCB (layout & board) from a 
simple 
> 
> > it is pretty simple design-wise.  An input, a timer, a memory, 
and a 
> > processor.  Albeit I haven't tested it, but that is why I brought 
it 
> > to forum.
> 
> You dropped your reply smack in the middle of the quoted text. Makes
> it rather difficult to read. ;'/
> 
> If this needs to be tested still, why not head over to the
> Electronics_101 list and ask for help there?
> 
> http://groups.yahoo.com/group/electronics_101
> 
> There's not much point in having someone make a PCB for you if it
> isn't tested yet. It does not look like a complete schematic on 
quick
> inspection.
> 
> Steve, the moderator


This is what I was saying in my post.  Many on-line schematics are 
only partial.


The best way to do something is to breadboard it to see if and how 
the circuit works and what is needed.

To post a link and then hope someone will read the schematic, layout 
a board, troubleshoot it and then make you a board is asking for a 
great deal of work as well as a lot of responsibility.

To lay out a board from a schematic and select/verify parts you can 
be looking at a couple hours.

to lay out a board from that an eleminate any potential problems with 
stray voltages and spurious signals may take another couple hours.

So, to read a schematic and layout a board could easily be a couple 
hundred dollars.  And there is no gurantee that the schematic will 
actually work.

To review the engineering behind the circuit can be simple like the 
power supply of the very first posted schematic, or it can be more 
than a few hours.  In monitary terms, another couple hundred bux.

If you have a tested board and have the schematic, most of us can do 
a rather fast copy and paste into schematic program and make a board. 

The tried and true method is to breadboard the circuit.  That way, 
you know the chips, and that the circuit works.

THEN make a board.

A much cheaper way is to buy perf board at radioshack and mount your 
stuff on that.


Dave