Homebrew PCBs

PANTUM here now waiting to be hacked.

SOIC is definitely doable.
This is a PIC16F629
http://www.learnmorsecode.com/laminator/etch/testetch5070.jpg
http://www.learnmorsecode.com/laminator/etch/testetch5077.jpg
http://www.learnmorsecode.com/laminator/etch/index.html

I sort of think of SOIC as a novelty.
Nothing in my hobby electronics world mandates SOIC.
Nothing SOIC has replaced anything DIP here because DIP is obsolete and 
unavailable.

I only show and tell SMT to educate the kids..... and intrigue the 
adults with
007 James Bond transmitters.... KNIGHTSMITE in a mint can.



On 12/09/2016 11:35 PM, 'Tony Smith' ajsmith1968@... 
[Homebrew_PCBs] wrote:
>
> Probably the best hobbyist method these days is to modify a cheap 
> printer to do direct printing as pioneered by Mark Lerman 
> (spelling?).  That didn\u2019t seem possible but he proved us wrong.  The 
> only consumable is acetone which other toner methods needs anyway.
>
> Laser & paint might be even easier but I\u2019ve yet to try it.
>
> I\u2019ve been finding for fine pitch work it\u2019s easier to buy those 
> adapters, solder the SMD part to that and them soldering that to the 
> main board is easier.  Packs of those are pretty cheap these days.  
> You convert the SMD into through hole so the main board is simpler. As 
> usual YMMV.
>
> Tony
>
> *From:*Homebrew_PCBs@yahoogroups.com 
> [mailto:Homebrew_PCBs@yahoogroups.com]
> *Sent:* Saturday, 10 December 2016 2:59 PM
> *To:* Homebrew_PCBs@yahoogroups.com
> *Subject:* Re: [Homebrew_PCBs] IS GREEN TRF the same thing as Heat 
> Transfer Foil Pigment Laser Toner Foil
>
>
>
> The goal was to figure out if the touchup pen can be omitted from the 
> process.
> Its hard to see to do the touchup.
>
> And as far as return on investment goes......
> IF it works with the craft TRF then that works out to less than a dime 
> of TRF per PCB.
>
>
>
> On 12/09/2016 10:18 PM, 'Tony Smith' ajsmith1968@... 
> <mailto:ajsmith1968@...> [Homebrew_PCBs] wrote:
>
>     I don\u2019t think the foil is going to add much that touching up with
>     a pen won\u2019t already.
>
>     The foil will probably lessen the edge quality (ragged edges) and
>     possibly spread the traces when run through the laminator again.
>
>     I\u2019m a bit dubious about the return on investment there.  I
>     remember this stuff from years ago.
>
>     Anyway, no harm trying.  Less harm if it\u2019s someone else trying it!
>
>     Tony
>
>     *From:*Homebrew_PCBs@yahoogroups.com
>     <mailto:Homebrew_PCBs@yahoogroups.com>
>     [mailto:Homebrew_PCBs@yahoogroups.com]
>     *Sent:* Saturday, 10 December 2016 1:53 PM
>     *To:* Homebrew_PCBs@yahoogroups.com
>     <mailto:Homebrew_PCBs@yahoogroups.com>
>     *Subject:* Re: [Homebrew_PCBs] IS GREEN TRF the same thing as Heat
>     Transfer Foil Pigment Laser Toner Foil
>
>
>
>     Because the toner is not 100 percent etch resistant.
>     The toner leaks. Not a lot,  a pin hole here and there.. a tracing
>     gap ..... imperfections.
>     The toner transfer isn't always perfect for me..... close... real
>     close to perfection.....
>     but not perfect every time.
>     http://www.learnmorsecode.com/laminator/pic/PIC16F628PROTO8d.jpg
>
>     So I have taken up the procedure of going over the toner with a
>     sharpie permanent marker...
>     then found EDDING 404 MUCH better than the sharpie.....
>     and getting excellent etchings:
>     http://www.learnmorsecode.com/pic/line/IMG_5156a.JPG
>
>
>     So now we have this problem solved by an arts and crafts type of
>     transfer method
>     that is known to STICK TO TONER quite well.
>     I have not used it yet but intend to learn if the cheap 100 foot
>     craft toner reactive foil will
>     deposit an acid resistent layer.
>     It would save me the task of tracing the toner.
>     One thing to note about all this testing on my stuff is that I'm
>     not manufacturing anythign to sell.
>     I'm just documenting what works for me to share with the
>     kids....scouts....newbies......
>     and I'm not making real tiny SMT projects.....
>     much of my traces are 1/8th inch and nothing real critical here.
>      BUT
>     its nice to learn how this CAN be done smaller.....
>     and I don't think its possible to hand trace SMT toner traces
>     without screwing them up.
>     So if TRF foils do this sealant task then that would be real nice
>     to learn.
>
>     And yes... I had that same thought about foil... metal...
>     etching......
>     so I bought the notsoshiny stuff to play with...thinking its just
>     the pigment we want to stick to the toner.
>
>
>     ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>     FROM :https://www.circuitspecialists.com/pcb-trf-green.html
>     This Green foil has a special adhesive coating ("sizing") applied
>     underneath the pigment color. When the foil and toner image are
>     subjected to high heat and pressure, the color permanently fuse to
>     just the toner image.
>     The interesting thing about toner (from a laser printer or
>     photo-copier) is that it is madeup of about 55% pulverized
>     plastic. So, by covering a toner printed image previously
>     transferred to the copper board, and applying heat & pressure to
>     it, the foil encapsulate the toner. In effect, the black toner
>     turns either Green or White. We use these two foils for two
>     different purposes.
>     GreenTRF is used to seal the toner "circuit image" after it has
>     been transferred to the circuit board.
>     Toner is a very porous material. If left alone and the board was
>     etched, you'd wind up with pitted surfaces or even hairline breaks
>     from cracks that were too small to see with the naked eye.
>     GreenTRF solves this problem by completely encapsulating the toner
>     image in one easy step. An absolute "must have" for producing
>     quality boards.
>     Film for colorizing and sealing black toner used as an "etch resist".
>     8" wide, 15 feet long.
>     +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
>
>
>     On 12/09/2016 09:06 PM, 'Tony Smith' ajsmith1968@...
>     <mailto:ajsmith1968@...> [Homebrew_PCBs] wrote:
>
>         Why bother putting foil over toner if the toner already works
>         as a resist?
>
>         Shiny though!
>
>         I wonder if it\u2019s conductive\u2026
>
>         Tony
>
>
>         I see there is this:
>         Heat Transfer Foil Pigment Laser Toner Foil 8"x100' Roll OR
>         4"x100' Roll US Made
>         so
>         I bought the 4 inch X 100 foot roll for $15 just to try it out.
>         Instructions all over the YOUTUBE say how to apply it to toner
>         artwork with an iron or laminator
>         so this looks to me like it might work for etching.
>
>
>
>
>
>
>
>
>         On 12/09/2016 10:56 AM, Rob roomberg@...
>         <mailto:roomberg@...> [Homebrew_PCBs] wrote:
>
>             I tried nail polish. I got what looked like crackle paint
>             hairline webs in the final copper traces.....
>             looked almost like ice crystals.... seemed to have shrunk
>             when it dried and then allowed acid to etch where it shrunk.
>             Considering all nail polish is not created equal there may
>             be a better etch resist nail polish. I am not the
>             guy to test all of them.
>
>             At $9 ....seems the price of 15 feet of GREEN TRF is cheep
>             enough to warrant experimenting with it.
>
>
>
>
>
>             On 12/09/2016 04:25 AM, Kevin Byrne kbyrne10@...
>             <mailto:kbyrne10@...> [Homebrew_PCBs] wrote:
>
>                 Yea but my Green TRF gets perfect copper traces no
>                 pits, no joke. Green trf under pieces of steel after?
>                 Would it work? My old way was cheep nail polish a
>                 cheep artist brush and direct etch. Nail polish
>                 remover to remove nail polish after acid bath. That
>                 could be done cheep by just going to dollar store for
>                 supplies and no more pits for your art work on copper.
>                 Kevin
>
>                 ------------------------------------------------------------------------
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