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Another Wacky Idea for Making Circuit Boards

D

D from BC

Jan 1, 1970
0
Getting photoresist chemicals...ugh...That's not on every store
shelf.. :)
Of course there are presensitized PCB's..
And there's the toner transfer methods..
And there's EDM, routing and sandblasting.

How about using UV adhesive... :p

I could spread UV adhesive on a PCB...
Then put a transparency on top with the PCB pattern and then put a
heavy glass plate on top of that.
Expose to UV..
Rince in _________.
Etch
Then strip the board with _______.

I don't know the blanks yet..

UV glue is about $30.00US/25cc. (Hughes) or $8.00US/2cc on Ebay

Can I get rich? $$$ :)
D from BC
 
Getting photoresist chemicals...ugh...That's not on every store
shelf.. :)
Of course there are presensitized PCB's..
And there's the toner transfer methods..
And there's EDM, routing and sandblasting.

How about using UV adhesive... :p

I could spread UV adhesive on a PCB...
Then put a transparency on top with the PCB pattern and then put a
heavy glass plate on top of that.
Expose to UV..
Rince in _________.
Etch
Then strip the board with _______.

I don't know the blanks yet..

UV glue is about $30.00US/25cc. (Hughes) or $8.00US/2cc on Ebay

Can I get rich? $$$ :)
D from BC


How many PCBs could you have made at Olimex by now? With the time and
money you spent tilting at windmills? Just curious.

You could print glue with an inkjet-type printer and coat in copper
pigment powder available at good artist supply houses. Still won't
give you plated through holes or even a garantee of alignment between
the layers. But I'd like to hear about what you'd do with copper
pigment.
(PS test to see if it's really copper by tossing it into a flame.
Green is the color you want)
 
R

Robert Baer

Jan 1, 1970
0
D said:
Getting photoresist chemicals...ugh...That's not on every store
shelf.. :)
Of course there are presensitized PCB's..
And there's the toner transfer methods..
And there's EDM, routing and sandblasting.

How about using UV adhesive... :p

I could spread UV adhesive on a PCB...
Then put a transparency on top with the PCB pattern and then put a
heavy glass plate on top of that.
Expose to UV..
Rince in _________.
Etch
Then strip the board with _______.

I don't know the blanks yet..

UV glue is about $30.00US/25cc. (Hughes) or $8.00US/2cc on Ebay

Can I get rich? $$$ :)
D from BC
How about the old-fashioned el-cheapo way: eggwhite sensitized with
potassium dichromate?
Develop with the universal solvent: water...
 
J

John Larkin

Jan 1, 1970
0
How about the old-fashioned el-cheapo way: eggwhite sensitized with
potassium dichromate?
Develop with the universal solvent: water...

Cool. Negative exposure, gold plate the traces, strip resist, and use
the gold as etch resist for the copper. Make pot au creme with the egg
yolks.

John
 
D

D from BC

Jan 1, 1970
0
How about the old-fashioned el-cheapo way: eggwhite sensitized with
potassium dichromate?
Develop with the universal solvent: water...

I've never heard of that..Does it work well?
Also...I think powdered eggwhite exists and would that work?
D from BC
 
D

D from BC

Jan 1, 1970
0
I've never heard of that..Does it work well?
Also...I think powdered eggwhite exists and would that work?
D from BC

I did a little GoogleFu on this and found that gelatine can be used.
Wikipedia mentions animal protein.
D from BC
 
D

D from BC

Jan 1, 1970
0
Very cool! See for the albumen photo process:
http://www.alternativephotography.com/process_albumen_paper.html

Piece of cake, so to speak.

also:
http://www.patentstorm.us/patents/4707433-description.html

Cheers,
James Arthur


I looked at:
http://www.patentstorm.us/patents/4707433-description.html
Casein is mentioned and I believe that's what's in Elmers white glue..
So maybe Elmers white glue + cancer causing potassium dichromate =
negative type photoresist... Wonderful! :)
When I was a kid..that cow on the label was always a mystery to me..
Cow bone glue.. :p

It's kinda like the potassium dichromate is the reverse of sunblock :)
UV SPF -40 for extra burn :p
(note the negative sign.)
D from BC
 
J

Jonathan Kirwan

Jan 1, 1970
0
I looked at:
http://www.patentstorm.us/patents/4707433-description.html
Casein is mentioned and I believe that's what's in Elmers white glue..
So maybe Elmers white glue + cancer causing potassium dichromate =
negative type photoresist... Wonderful! :)
When I was a kid..that cow on the label was always a mystery to me..
Cow bone glue.. :p

It's kinda like the potassium dichromate is the reverse of sunblock :)
UV SPF -40 for extra burn :p
(note the negative sign.)
D from BC

All this reminds me of using potassium dichromate and sulfuric acid to
make "chemist's cleaning solution," which I'd use to clean glassware.
Wonderful stuff. To dispose, I'd have to reduce to chromium-III with
sulfite salts and then neutralize that stuff with sodium bicarbonate
or hydroxide (exothermic.)

Jon
 
R

Rich Grise

Jan 1, 1970
0
I looked at:
http://www.patentstorm.us/patents/4707433-description.html Casein is
mentioned and I believe that's what's in Elmers white glue.. So maybe
Elmers white glue + cancer causing potassium dichromate = negative type
photoresist... Wonderful! :) When I was a kid..that cow on the label was
always a mystery to me.. Cow bone glue.. :p

Actually, Elmer was Elsie's "husband" in the Borden's Milk logo. Their
"daughter" was Beulah.
....
Just did a quick search, and apparently there is no such thing as
"Borden's Milk" any more, just archival stuff. )-;
....
Did a little more in-depth search, for images this time, hoping to see a
logo, and imagine my surprise - Elmer's glue is made by Borden!
http://www.officedepot.com/textSearch.do?uniqueSearchFlag=true&Ntt=elmer's+glue

Cheers!
Rich
 
R

Robert Baer

Jan 1, 1970
0
D said:
I've never heard of that..Does it work well?
Also...I think powdered eggwhite exists and would that work?
D from BC
Powdered eggwhite works just as well.
The problems are that the "shelf life" of sensitized board is maybe a
week or two, and the surface is sensitive to scratching (it is soft
eggwhite).
This "trick" has been around since at least the 1970's.
 
D

D from BC

Jan 1, 1970
0
Powdered eggwhite works just as well.
The problems are that the "shelf life" of sensitized board is maybe a
week or two, and the surface is sensitive to scratching (it is soft
eggwhite).
This "trick" has been around since at least the 1970's.

I'll keep an eye out for some potassium dichromate.. I think I can get
it at photo supply shops..It might be pricy from the local chemical
distributor..

....well this thread is about to fizzle out..
I'd like to lastly mention that nobody made fun of the obvious flaw
that UV glue would glue the transparency to the PCB..
It might be very difficult to remove!

....but maybe some spray PAM or spray silicone on the transparency
might help..
D from BC
 
R

Rich Grise

Jan 1, 1970
0
...well this thread is about to fizzle out.. I'd like to lastly mention
that nobody made fun of the obvious flaw that UV glue would glue the
transparency to the PCB.. It might be very difficult to remove!

Maybe going through all these gyrations is fun for you, but it sounds like
a PITA to me.

I like the idea of printing the artwork on my dot-matrix, xeroxing it onto
coated paper, and ironing it onto the board. The only chemical involved is
the etchant, and you don't have to be in the dark to prepare the resist. :)

Cheers!
Rich
 
R

Robert Baer

Jan 1, 1970
0
Rich said:
Maybe going through all these gyrations is fun for you, but it sounds like
a PITA to me.

I like the idea of printing the artwork on my dot-matrix, xeroxing it onto
coated paper, and ironing it onto the board. The only chemical involved is
the etchant, and you don't have to be in the dark to prepare the resist. :)

Cheers!
Rich
There have been a few XEROX and other printers that hav a flat
(paper) pass-thru, and accept fairly thick "paper".
AFAIK all of those are useable for *direct* printing of the pattern
onto the PCB.
Some of the first lazer copy machines were like that, and Lexmart
"recently" (2-5 years ago?) had one like that.
 
E

Ecnerwal

Jan 1, 1970
0
Robert Baer said:
There have been a few XEROX and other printers that hav a flat
(paper) pass-thru, and accept fairly thick "paper".
AFAIK all of those are useable for *direct* printing of the pattern
onto the PCB.
Some of the first lazer copy machines were like that, and Lexmart
"recently" (2-5 years ago?) had one like that.

As I've said before, old flatbed pen plotters, with a resist ink pen
also worked well for direct printing of resist. Plot, dry, etch.
 
Y

YD

Jan 1, 1970
0
Maybe going through all these gyrations is fun for you, but it sounds like
a PITA to me.

I like the idea of printing the artwork on my dot-matrix, xeroxing it onto
coated paper, and ironing it onto the board. The only chemical involved is
the etchant, and you don't have to be in the dark to prepare the resist. :)

Cheers!
Rich

Dot-matrix? How's the resolution with it? Do you print expanded and
reduce the copy? I recall having done that with some artwork stuff at
a time when laser-printers were affordable only to the rich and
wealthy.

Personally I run photo-paper through my laser-printer and then do the
thermal transfer thing. Takes a bit of experimenting with different
brands and types but now I've found a good combination that lets me
successfully do 0.1 mm (4 mil) traces. Not that I use such fine pitch
for anything but lettering, standard is 0.4 mm (15 mil). Bit of a PITA
to remove but the result compensates.

- YD.
 
D

D from BC

Jan 1, 1970
0
Dot-matrix? How's the resolution with it? Do you print expanded and
reduce the copy? I recall having done that with some artwork stuff at
a time when laser-printers were affordable only to the rich and
wealthy.

Personally I run photo-paper through my laser-printer and then do the
thermal transfer thing. Takes a bit of experimenting with different
brands and types but now I've found a good combination that lets me
successfully do 0.1 mm (4 mil) traces. Not that I use such fine pitch
for anything but lettering, standard is 0.4 mm (15 mil). Bit of a PITA
to remove but the result compensates.

- YD.

Toner transfer ...ugh.. :p
I ordered dry-film photoresist to put an end to that....
D from BC
 
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