Silk screen markings for positive and ground power rails

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#1
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A little while back Johnathan Oxer from Practical Arduino did a review of my 28 Pin AVR Development Board. In the review he mentioned that the silk screen markings for the power rails were counter intuitive. I'm currently working on the next version of this board and want to determine whether his thoughts are universal.

Can you please take the time to answer this simple poll question. Look at the photos below and indicate which makes the most sense.

Oh, for those who are interested, the review can be found at http://www.youtube.com/watch?v=jypURMc8bow

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There should be a "neither" option to the poll. Why not just stick a "+" and a "-" in there somewhere? I think some people decided on this about 50 years ago.

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I've never seen it indicated using either of those methods. Something like +5V and Gnd are typically used.

Leon

Leon Heller G1HSM

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I voted for Option A.

Note, however, that some boards have the opposite interdigitation of the two rail sets at the other end of the board, making it a moot point.

If you were to change the way you have done it, you stand the chance of really messing up the folks who supported you and bought board Version I, if you reverse it now!

The silk screen labels: +5V & Gnd, should help either way.

JC

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leon_heller wrote:
I've never seen it indicated using either of those methods. Something like +5V and Gnd are typically used.

I don't think I explained myself well.

Consider the case where you have a PCB with 2 connection points. One marked "+" and the other marked "-". Now you connect a blue wire to each of these connection point.

You could tell which was positive or negative by tracing back to the PCB, but it would be a pain. You could also draw a bunch of "+" and "-" symbols along the wire to help. But if you used a red and black wire, it is a totally different ball game. You cam immediately tell which one is which. This is what I'm trying to achieve when marking the power buses.

I'm thinking though that it might be useful te supplement the existing markings with a "+" and "-".