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Old 21st December 2002, 02:21 AM   #11
BrianL is offline BrianL  United States
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Rounded traces for extremely high RF and microwaves.

Even op-amps with GHz. gain-bandwidths don't need rounding.

45 degree corners are nice from etching standpoint and
aesthetics.
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Old 21st December 2002, 07:40 AM   #12
ALW is offline ALW  United Kingdom
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Default Mark,

One question - you did start from a schematic in Eagle didn't you?

One should always do this for several reasons, it gives you nice documentation for future use, and it makes the PCB layout far easier, since the connections (or netlist) are transferred to the layout, reducing the chance for mistakes and errors in connection.

Andy.

P.S. Rounded traces are rarely used at RF, usually one is working with stripline / microstrip transmission lines, where mitreing the corners is the accepted approach to negating the impedance change when a track changes direction.

Depending upon the speed of your signals it can become necesssary to think about such things with op-amps, if only from an EMC perspective.

With audio it's rarely a problem, if you bandwidth limit input signals (as you should).
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Old 21st December 2002, 01:08 PM   #13
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Default On Part Sizes

The first time you use the part sizes the specifications are a little overwhelming. I did the following: Draw a circuit design of just capacitors, just resistors, just diodes, just DCDC blocks, just AMP connectors etc -- keep each as a separate design file in a separate folder within your CAD library, then print the layouts and keep them in a notebook.

After a while, you will get to standardize your purchases and know from memory that you bought 10nF/50v bypass caps from Mouser and they are KERK04X3R2_5 or that a LM317LZ is going to be...

I would not suggest starting out with 10 mil traces for your first home-made boards. 20 mil is fine. When you reduce the trace size other factors such as exposure time, development time, etch time become more critical. and all you need is one small bubble to screw up a path.

As someone else has suggested you might want to edit the pads on IC's and other devices -- but keep these modified devices in a separate folder, or modify the description when you save, i.e. don't over-write the original design.
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Old 21st December 2002, 01:28 PM   #14
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Quote:
Originally posted by MWP
One thing to remeber is to try and not have 90° bends in tracks... only 45°.
90° can cause the tracks to be over etched in the corners.
This is only important is the traces are very small, < 15-10 mil but I think it looks nicer if 90 degree corners are avoid.
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Old 21st December 2002, 01:32 PM   #15
Electrons are yellow and more is better!
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Mark Hayenga, your pcb is starting to look pretty good and I think your project is "lagom" (not too small and not too big) to start with.
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