13 Sep
2005
13 Sep
'05
10:52 a.m.
DIY is fun, but try this site for pc boards.
$88. for quantity 2, double sided boards, 4 day turnaround
$122 for quantity 2, 4 layer boards, 4 day turnaround
Same price up to 85 sq. inches. High quality boards.
Just make sure you follow the rules for the "No touch" price, because they
send you exactly what your Gerbers contain.
|---------+----------------------------->
| | Roger Merchberger |
| | <zmerch at 30below.co|
| | m> |
| | Sent by: |
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| | |
| | 09/07/2005 12:58 |
| | PM |
| | Please respond to |
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| | On-Topic Posts |
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| To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org> |
| cc:
|
| Subject: Re: Homebrew Circuit Boards: Methods? Supplies?
|
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Rumor has it that Jeff Walther may have mentioned these words:
I imagine this topic has come up before, so my
apologies in advance.
Do folks have a recommendation for suppliers of circuit board making
materials, or a good source of such information?
I got my stuff at http://www.circuitspecialists.com/
Best prices & selection I could find and they have 1/16", 1/32" and
1/64"
thickness pre-sensitized photoresist boards. They even have "how-to" books
for beginners on making photoresist boards & whatnot.
http://www.circuitspecialists.com/prod.itml/icOid/7783 (Link to the
beginners book I mentioned - I bought it and it's a very good read.)
I have not yet had time to build the projects for which I purchased my
shiznit, but I should be able to before Xmas, so I'll know a lot more
soon... ;-)
I am not affiliated with the company other than being a (so far) satisfied
customer.
In fact, I have not been able to find precoated board
(photoresist coated)
in the .050" thickness. So I will either need to
use a liquid photoresist
or try a toner transfer system.
I dunno about 0.050", but would the 1/32" thickness be close enough?
(That's 0.03125" thickness, if you can believe the Winders calcaputer
applet ;-)
That raises other questions. Are the Toner Transfer
Systems reliable
No. Especially since the toner xfer systems were designed around toner that
melts around 300 deg. C... a lot of the 'microfine' toner printers melt
their toner a *lot* hotter than that, and don't get good adhesion to the
xfer sheets. (Most laser printers made in the last 5-8 years are all
microfine toner - anything 600dpi+ will be.) The last time I tried (5+
years ago) I used 10 sheets to *finally* get one that didn't require metric
buttloads of touchups with a resist pen.
If the TTS is not servicable, then I'll try the
liquid photoresist.
I'd say to try pre-sensitized... but that's just me.
Would it be better to simply spray on, or should I
try to rig a spinner?
Do the developer and/or stripper usually turn out to be some commonly
(cheaply) available chemical? I would prefer to avoid paying $6+ for a
small bottle if I can avoid it.
One kg of ammonium persulfate will make 4 liters of etchant, and it's
around $18 USD (not including shipping) - not sure if you'll be able to
find it much cheaper than that, but if you do, let everyone here know! ;-)
The other chemical used is ferric chloride.
Hope that helps,
Roger "Merch" Merchberger
--
Roger "Merch" Merchberger | A new truth in advertising slogan
SysAdmin, Iceberg Computers | for MicroSoft: "We're not the oxy...
zmerch at 30below.com | ...in oxymoron!"
14 Sep
14 Sep
4:18 p.m.
>>>> "Steven" == Steven R
Hutchins <Steven_R_Hutchins at Raytheon.com> writes:
Steven> DIY is fun, but try this site for pc boards. $88. for
Steven> quantity 2, double sided boards, 4 day turnaround $122 for
Steven> quantity 2, 4 layer boards, 4 day turnaround Same price up to
Steven> 85 sq. inches. High quality boards. Just make sure you
Steven> follow the rules for the "No touch" price, because they send
Steven> you exactly what your Gerbers contain.
Which site?
There are dozens of companies in that business. If you look in the
back of any issue of EE Times, Electronic Products, etc., you will
find the ads.
I personally have good experience with PCB Pool (for a 4-layer board,
not dense but with fine detail for surface mount parts). They are
interesting in that they can accept not just Gerber files, but also
Eagle CAD files, which are easier to work with if that's the tool
you're using. (And a limited version of Eagle CAD is available for
the download. It's pretty nice.)
A lot of those outfits will do the cutting with a router to produce
whatever board outline you need, which is good for stuff like SIMM
boards. Gold plated fingers may be an issue, though; I haven't seen
those. (Then again I wasn't looking for them.) Plain old tin plate
may be ok.
paul
4:27 p.m.
Paul Koning wrote:
I personally have good experience with PCB Pool (for a
4-layer board,
not dense but with fine detail for surface mount parts). They are
interesting in that they can accept not just Gerber files, but also
Eagle CAD files, which are easier to work with if that's the tool
you're using. (And a limited version of Eagle CAD is available for
the download. It's pretty nice.)
The only thing good about eagle is has a schematic package.
I am still looking for a free PCB and a free Schematic entry
program because that for me is bigger than eagle's demo size.
While waiting for PCB's now may be the time to evaluate some
programs before you create your sim's.
Ben alias woodelf
PS I remember somebody put a linux? system on a sim. If you can
find that page it may help you with your design.
4:55 p.m.
>>>> "woodelf" == woodelf
<bfranchuk at jetnet.ab.ca> writes:
woodelf> Paul Koning wrote:
> I personally have good experience with PCB Pool
(for a 4-layer
> board, not dense but with fine detail for surface mount parts).
> They are interesting in that they can accept not just Gerber
> files, but also Eagle CAD files, which are easier to work with if
> that's the tool you're using. (And a limited version of Eagle CAD
> is available for the download. It's pretty nice.)
woodelf> The only thing good about eagle is has a schematic package.
woodelf> I am still looking for a free PCB and a free Schematic entry
woodelf> program because that for me is bigger than eagle's demo
woodelf> size.
Sure. That wasn't a problem for me because I bought Eagle CAD way
back when, before they had the free version, so mine doesn't have the
limits. For that matter, if you spend some money that is still true.
I don't know about free layout tools, much less free autorouters. Are
there any? (The Eagle autorouter isn't all that good but it does get
the job done, and you can easily clean up its output if you think it
looks too ugly.)
paul
5:03 p.m.
On Wed, 14 Sep 2005, woodelf wrote:
The only thing good about eagle is has a schematic
package.
I am still looking for a free PCB and a free Schematic entry
program because that for me is bigger than eagle's demo size.
While I haven't had the chance to create a PCB with these, I've used
Xcircuit to draw schematics:
http://xcircuit.sourceforge.net/
It can export netlists to another free program, PCB, for board layout:
http://pcb.sourceforge.net/
as well as SPICE.
Mike Loewen mloewen at cpumagic.scol.pa.us
The B9 Robot Builders Club B9-0014 http://ripsaw.cac.psu.edu/~mloewen/B9/
Old Technology http://ripsaw.cac.psu.edu/~mloewen/Oldtech/
9:35 p.m.
New subject: Article from OCT 1992 Macworld
Anybody happen to have the OCT 1992 Issue of Macworld? Was wondering if you
can scan a few pages for me of an article on Accelerators starting on page
181.
Macworld -- Oct-92
a.. Accelerators -- pg. 181
a.. Performance/040 (33 MHz)
b.. Radius Rocket 33
c.. TokaMac II FX 33
9:46 p.m.
You might check out Target 3001. They have a free version, the only catch
is you must use their partner's PCB service. I used the service once,
excellent results, prices a bit on the high side. The cost for a paid
version that lets you do Gerber output is pretty reasonable.
http://www.ibfriedrich.com/english/index.htm
The only thing good about eagle is has a schematic
package.
I am still looking for a free PCB and a free Schematic entry
program because that for me is bigger than eagle's demo size.
While waiting for PCB's now may be the time to evaluate some
programs before you create your sim's.
Ben alias woodelf
PS I remember somebody put a linux? system on a sim. If you can
find that page it may help you with your design.
7049
days inactive
7050
days old
6 comments
6 participants
participants (6)
-
bfranchuk＠jetnet.ab.ca -
jp＠acm.org -
mloewen＠cpumagic.scol.pa.us -
pkoning＠equallogic.com -
Steven_R_Hutchins＠Raytheon.com -
teoz＠neo.rr.com