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Subject: Re: [Homebrew_PCBs] Re: PCB design software

From: Stefan Trethan <stefan_trethan@...>
Date: 2003-05-13

thank you!

i examined the file with my splot viewer (which normally does everything like my plotter does it).

first obvious thing was that there are 2 images of the wanted layer plot one after the other.
the second is shifted upwards half the hight of the pcb.

this seems to me like a problem with some layer setting or so. but can also be easily removed by
deleting the hpgl commands.


to the holes:

you expected right, the holes are open, but not all.
the thick ground trace is closed all the way.
at the vcc trace there are all holes of the thick part closed and the upper right bridge pad also.

further all pins which are connected through this wire bridge are also "infected" and closed (the 3 pins
on top and the two on bottom.

it really seems the whole net is "infected" but the vcc on con16 is clear... strange..

may you have another look at your layers and look what you have made different with this traces?
have you done something "unusual" to make them wider???

all traces which are thicker then standard have closed holes.
only exception is the con16 vcc.

so this must somehow cause it.

regard
stefan



12.05.2003 23:26:57, "Leon Heller" <leon_heller@...> wrote:

>
>----- Original Message -----
>From: "Stefan Trethan" <stefan_trethan@...>
>To: <Homebrew_PCBs@yahoogroups.com>
>Sent: Monday, May 12, 2003 8:51 PM
>Subject: Re: [Homebrew_PCBs] Re: PCB design software
>
>
>> hmm i have two questions on that:
>>
>> a) does it keep the holes really open?
>> my orcad has also such a option but when i make hpgl export it simply does
>"negative" drawing (with
>> another pen in plotter) which "deletes" the center out. this is because
>this is done so with negative
>> areas in the apertures. it actually has two layers for each physical
>layer, on containing positive, one
>> negative information if you select "keep drill holes open".
>
>The HPGL output has a few problems when imported into GC-Prevue (I don't
>have a plotter) but the holes are there, as I expected.
>
>
>
>> if you have the software installed may you please take a simple pcb and
>make me a hpgl file with one
>> copper layer and the pads on it? this would be very great as i could see
>if it would work without having
>> all the trouble of getting it, installing, etc...
>> you may directly email it to stefan_trethan@... or upload it at yahoo
>if anyone else wants to see.
>> i would very appreciate this if possible....
>> please meke sure if you can provide the file there is at least one pad and
>one copper trace connected to
>> one pad (sometimes the hole in the pad is there but the trace "sticks" in
>there to the middle.
>
>I've sent the file to Stefan.
>
>
>>
>>
>> b) is there a way to get the software, lets call it "cheap", for private
>use ?
>
>
>You can download a demo, limited to 100 pins.
>
>It's quite expensive to buy ($1000 upwards). EasyPC (same company but
>different web site) is a lot cheaper, but less capable. It will also output
>HPGL.
>
>Leon
>--
>Leon Heller, G1HSM
>leon_heller@...
>http://www.geocities.com/leon_heller
>
>
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