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From: kensmith@sunybcs.UUCP (Ken Smith)
Newsgroups: net.arch,net.micro
Subject: Re: Re: How to fab One-Of-A-Kind systems?
Message-ID: <1690@sunybcs.UUCP>
Date: Sun, 19-May-85 23:42:25 EDT
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Posted: Sun May 19 23:42:25 1985
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	Well, since most of the net has seemed to suggest wire-wrapping
you might like some pointers on how to go about it.  First, make reasonable
circuit schematics, and get a blueprint made.  Using the blueprint start
making connections using sockets and, for discrete parts get the pins that
you insert into the board and solder the discretes onto later. (The only
place these pins aren't necessary is when you have lots of resistors of
the same value in generally the same area, in which case it is easier to
just use another socket.)  Keep going for as long as you can at one shot,
this helps reduce the chances for errors.  Keep a diagram that shows which
parts are what (i.e. a layout diagram) so you can find them later.  Labels
also help (especially those labels for the back-side of sockets with the
pin numbers, though these get expensive).  Whether you start checking
while constructing the circuit or after it is all connected is up to you,
but do continuity checks on ALL connections, and (this is where the blue-
print comes in) use one of those high-lighting markers to mark all the
connections you have checked.  The continuity checks are important, it's
very possible to have breaks in the wires but the insulation is still
intact so it LOOKS connected.  A multi-meter that beeps for continuity
checks is nice, as are clip probes and those headers you can stick in
the socket that have pins on both sides.  When done solder in the discretes
and start to debug it...  I'm still relatively new to wire-wrapping so
there are probably many other things that make life easier that I haven't
tripped over yet, but this should get anyone interested started on the
right track.


-- 
-----
						Ken Smith
- Don't rattle my bars!