Re: Need help reproducing a PCB

[Jim Brain via cctalk]

On 5/10/2017 6:02 PM, wrco...@wrcooke.net wrote:

In EAGLE I am having very good luck with:


 * Getting some nice B versions of the scans (Thanks everyone, but
   especially Paul)
 * importing them into EAGLE under layer 200 and 201 (reversing bottom
   layer)
 * setting layers to some light colors (pale yellow and pale green are
   my choices)
 * moving them so they line up (not perfect, but I tried)
 * Move all of the PCB footprints to match up with holes
 * Turn off top layer
 * start routing bottom layer (tedious, but not too hard)
 * repeat for top layer


A pic of progress:

https://s6.postimg.org/vkffvf8sh/Capture.png


--
Jim Brain
br...@jbrain.com  
www.jbrain.com

Re: Need help reproducing a PCB

[Jim Brain via cctalk]

On 5/10/2017 11:29 AM, Alexandre Souza via cctalk wrote:

Anders, mind sharing which method you use to redraw a PCB? I have lots of
interest in this subject.
I know the question was not directed at me, but since I am doing exactly 
this, I can offer my perspective.


 * I first scanned the files
 * Then, I reversed the back and cropped so both pics were the same
   size and orientation
 * I then used a photo manipulation app to create two "layers" and put
   the two images in a layer each
 * I then created a new layer and set the brush to small
 * I then created a schematic of the unit in EAGLE, putting all of the
   parts in the schematic in the general location as they were on the board
 * I the started tracing over the layers, turning on or off the top
   layer to see and trace the bottom layer.
 * Once I found two connections, I added the connection in EAGLE schematic
 * Repeat until all traces are covered with a brush stroke
 * I then had a really horrid looking schematic
 * The next step was to clean up the schematic
 * Next, I laid out the PCB according to the original, placing all of
   the parts in the same place.
 * Now, I intend to trace the metal into the PCB design.  I figure if
   there any discrepency, then I can fix the schematic and I will have
   more confidence that the design is correct.
 * The last step is to get a PCB manufactured, and see if the design
   still works.

Jim

Re: Need help reproducing a PCB

[Jim Brain via cctalk]

On 5/10/2017 10:23 AM, Doug Ingraham wrote:

If this is a one off all you need to do is print the negatives
I think my main problem right now is getting true negatives.  The scans 
I took don't immediately yield sharp negatives, and so photo editing is 
needed to create that.


Once that happens, this (or other options) are very possible.

Re: Need help reproducing a PCB

[Anders Nelson via cctalk]

Hey Alex,

I haven't re-traced a PCB but I would probably do the same thing Jim is
suggesting - import a graphic into my CAD program and trace it over with
metal. EAGLE has lots of scripts available to import graphics, DXFs and do
other completely different things. You can also write your own!

I'll be able to try converting his scans to 2-color, then he can import
them using his scripts. I won't have tim to do the tracing with metal
though.

=]

--
Anders Nelson

+1 (517) 775-6129

www.erogear.com

On Wed, May 10, 2017 at 9:29 AM, Alexandre Souza <
alexandre.tabaj...@gmail.com> wrote:

> Anders, mind sharing which method you use to redraw a PCB? I have lots of
> interest in this subject.
>
>
> 2017-05-10 13:20 GMT-03:00 Anders Nelson via cctalk  >:
>
>> Hey Jim,
>>
>> I can probably do this for you but I'm pretty busy for the moment. What's
>> your desired timeline? I've been using EAGLE since 2005 so I'm familiar.
>>
>> =]
>>
>> --
>> Anders Nelson
>>
>> +1 (517) 775-6129
>>
>> www.erogear.com
>>
>> On Wed, May 10, 2017 at 8:23 AM, Doug Ingraham via cctalk <
>> cctalk@classiccmp.org> wrote:
>>
>> > If this is a one off all you need to do is print the negatives on
>> > transparency material with a laser printer.
>> > The laser printers tend to have a little more opacity than ink jets do
>> but
>> > I have done this with an ink jet
>> > printer as well.  I also once plotted directly on the bare copper with a
>> > sharpie and had it turn out ok.
>> >
>> > Align the negatives on the sensitized board stock.
>> > Expose.
>> > Develop.
>> > Etch.
>> > Drill
>> > Solder in your feed throughs.
>> > Put the parts on the board.
>> > Debug
>> >
>> > If on the other hand you want to make even 5 boards you would be better
>> off
>> > with your approach.
>> >
>> > Best wishes!
>> >
>> > --
>> > Doug Ingraham
>> > PDP-8 SN 1175
>> >
>>
>
>

Re: Need help reproducing a PCB

[Alexandre Souza via cctalk]

Anders, mind sharing which method you use to redraw a PCB? I have lots of
interest in this subject.


2017-05-10 13:20 GMT-03:00 Anders Nelson via cctalk :

> Hey Jim,
>
> I can probably do this for you but I'm pretty busy for the moment. What's
> your desired timeline? I've been using EAGLE since 2005 so I'm familiar.
>
> =]
>
> --
> Anders Nelson
>
> +1 (517) 775-6129
>
> www.erogear.com
>
> On Wed, May 10, 2017 at 8:23 AM, Doug Ingraham via cctalk <
> cctalk@classiccmp.org> wrote:
>
> > If this is a one off all you need to do is print the negatives on
> > transparency material with a laser printer.
> > The laser printers tend to have a little more opacity than ink jets do
> but
> > I have done this with an ink jet
> > printer as well.  I also once plotted directly on the bare copper with a
> > sharpie and had it turn out ok.
> >
> > Align the negatives on the sensitized board stock.
> > Expose.
> > Develop.
> > Etch.
> > Drill
> > Solder in your feed throughs.
> > Put the parts on the board.
> > Debug
> >
> > If on the other hand you want to make even 5 boards you would be better
> off
> > with your approach.
> >
> > Best wishes!
> >
> > --
> > Doug Ingraham
> > PDP-8 SN 1175
> >
>

Re: Need help reproducing a PCB

[Anders Nelson via cctalk]

Hey Jim,

I can probably do this for you but I'm pretty busy for the moment. What's
your desired timeline? I've been using EAGLE since 2005 so I'm familiar.

=]

--
Anders Nelson

+1 (517) 775-6129

www.erogear.com

On Wed, May 10, 2017 at 8:23 AM, Doug Ingraham via cctalk <
cctalk@classiccmp.org> wrote:

> If this is a one off all you need to do is print the negatives on
> transparency material with a laser printer.
> The laser printers tend to have a little more opacity than ink jets do but
> I have done this with an ink jet
> printer as well.  I also once plotted directly on the bare copper with a
> sharpie and had it turn out ok.
>
> Align the negatives on the sensitized board stock.
> Expose.
> Develop.
> Etch.
> Drill
> Solder in your feed throughs.
> Put the parts on the board.
> Debug
>
> If on the other hand you want to make even 5 boards you would be better off
> with your approach.
>
> Best wishes!
>
> --
> Doug Ingraham
> PDP-8 SN 1175
>

Re: Need help reproducing a PCB

[Doug Ingraham via cctalk]

If this is a one off all you need to do is print the negatives on
transparency material with a laser printer.
The laser printers tend to have a little more opacity than ink jets do but
I have done this with an ink jet
printer as well.  I also once plotted directly on the bare copper with a
sharpie and had it turn out ok.

Align the negatives on the sensitized board stock.
Expose.
Develop.
Etch.
Drill
Solder in your feed throughs.
Put the parts on the board.
Debug

If on the other hand you want to make even 5 boards you would be better off
with your approach.

Best wishes!

-- 
Doug Ingraham
PDP-8 SN 1175

Re: Need help reproducing a PCB

[Systems Glitch via cctalk]

Mile High Test/Gardien Services in Colorado will scan boards for you and give 
you ready-to-go Gerbers. It cost around $250 to have an OSI sized 2-layer board 
scanned (8x10 inches).

Thanks,
Jonathan

On Tue, 9 May 2017 22:46:08 -0500
Jim Brain via cctalk  wrote:

> I am trying to reproduce a PCB design, and I have removed all the ICs, 
> scanned the boards, and am trying to draw it up in EAGLE.  But, it would 
> much easier if I could import the actual PCB as a bitmap under my PCB 
> layout, to ensure I have have everything in the right place.
> 
> Sadly, my graphics manipulation skills are suboptimal, and I am 
> wondering if there is anyone on the list that could take my scans and 
> convert them into 2 color bitmaps of the correct size such that I could 
> import.  When I tried to convert, the difference between light green and 
> dark green essentially removed most of the traces.
> 
> Jim
> 
> 
> -- 
> Jim Brain
> br...@jbrain.com
> www.jbrain.com
> 

Need help reproducing a PCB

[Jim Brain via cctalk]

I am trying to reproduce a PCB design, and I have removed all the ICs, 
scanned the boards, and am trying to draw it up in EAGLE.  But, it would 
much easier if I could import the actual PCB as a bitmap under my PCB 
layout, to ensure I have have everything in the right place.


Sadly, my graphics manipulation skills are suboptimal, and I am 
wondering if there is anyone on the list that could take my scans and 
convert them into 2 color bitmaps of the correct size such that I could 
import.  When I tried to convert, the difference between light green and 
dark green essentially removed most of the traces.


Jim


--
Jim Brain
br...@jbrain.com
www.jbrain.com