>> The easiest way is to use a MAX232 driver chip. It's a dual RS232 powered
>You could use the suggested solution of using the MAX232 which is available
>from digi-key for $0.90each in quantities of 1.
For receive only from a GPS, I find an opto-isolator and a couple
resistors is even cheaper/easier than the max232. I used 4n35
because I had a few sitting around, and it worked fine at 4800 bps.
>To build a printed circuit board by going to www.expresspcb.com and
>downloading and using their tools (Windoz only unfortunately). The cost of
>that would be $51 dollars or $17 each.
I've had good experience with expresspcb's miniboard service. You get
exactly 3 boards of 2.5 x 3.8 boards for $51 + shipping, no matter what
is on the board. IIRC, shipping was about $8, so about $60 per order
or about $20 per board.
Last time I used them, I packed eight circuits onto a single board,
and then cut them apart with a dremel tool. Either the max232 or the
opto-isolator circuit is small enough that this kind of thing would
be practical. The only drawback I found is dealing with the dust you
get from cutting the board.
Mark S.
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