Protel Bits to AP Circuits Atoms

by Ben Resner (benres@media.mit.edu)

Now that you've created your PCB it's time to take the leap from bits to atoms.  Here's a step by step guide to preparing the board for AP Circuits.  If this is your first time, give yourself up to 1 - 2 hours for this process.  As you become more experienced, it'll take about ten minutes.

A few Protel notes:

Add Corner Marks

In addition to having you specify the board size, AP Circuits requests corner marks be placed in the corners of the board.  Place corner marks as you would any top layer trace.  If you have a keepout layer, simply place the corner marks over the keepout layer.  The keeput layer simply defines the boundaries of the circuit board.  If you use autoroute, all traces are constrained to be inside the keepout layer.

Run Hole Size Editor

Install the Hole Size Editor (holesizeeditorforprotel99se.exe in \\milliserver\resenv\software\Protel99SE).  You'll have to quit Protel to do this.  Run the hole size editor by selecting "Hole Size Editor" from the "Edit" menu while PCB document is active.  You want to be sure you're only using "free" holes from AP Circuits.  If you use non-free hole sizes, they charge you $$$.  AP Circuits gives enough free hole sizes there's no reason to stray, especially for a prototyping board.  Free hole sizes, as well as other info about holes can be found at:  http://www.apcircuits.com/resources/technologies/drills.html

Note the hole size is not the size of the hole you will get.  You're actually specifying the drill size.  Plating the hole reduces it's size.  AP Circuits recommends adding .01" to the dimensions of all components to make sure they'll fit in the hole.  They should have used the words "drill size" instead of "hole size".  I agree with AP Circuits that .042" is a very versatile hole size for things like resistors, LEDs and DIP sockets.

The hole size editor simply reports the number of each sized hole.  Unfortunately it doesn't tell you which holes are which size.  It's up to you to figure that out.

Create NC Drill File

Create Gerber Files

Check Your Work

Create Output Files

Send to AP Circuits

Now it's time to run AP Client.  Download and install APCLIENT.ZIP from AP Circuits.  If it's your first time, you'll be asked about billing and shipping info, and whether you want to use a Fedex account number, or just have the Fedex cost added to the bill.

You're all set.  Use the built-in FTP functionality to send you completed file directly to AP Circuts.