Re: MAKING EXCELLENT PCBs using toner transfer


petertech99h
 

Hi all,
In the days 'BC' (before CAD) I used Red and Blue mylar layout tapes and black adhesive IC pad shapes scaled 2X to do double sided PCBs.  The artwork got sent out and photographed with filters to produce 2 production films, 1 top, 1 bottom, black pads showed up on both films, overlapping red and blue produced black traces on both sides.
In high school I did a double-sided PCB making 2 artworks over a drafted layout with layout targets just outside the board outline then image the board one side at a time with 2 plates of glass and the board and artworks sandwiched inside.
Is anyone interested how plate-thru holes are made? or is everyone up to speed on that?  It may be possible to do that at home too!

Lots of fun, still have the boards plus a spare!
Pete

On Tuesday, March 8, 2016 12:59 AM, "'Dennis Tillman' dennis@... [TekScopes]" <TekScopes@...> wrote:


  Hi Dave,
Me too. Plus OSHPark boards are gold coated which is very unusual and very prettyl!!!.
Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]
Sent: Monday, March 07, 2016 9:31 PM
To: TekScopes@...
Subject: Re: [TekScopes] MAKING EXCELLENT PCBs using toner transfer

I have been very happy getting boards made by OSHpark.com, who offer both two and four layer small quantity fabrication at a reasonable price.

I did buy the Pulsar kit, but only with the intention of using it for certain projects where I felt it would be more cost effective than using a fab (such as a large area board of which I only plan to make one copy).

Dave Casey

On 3/7/2016 10:34 PM, 'Dennis Tillman' dennis@... [TekScopes]
wrote:

Hi George, Dave, et al,
I made my own PC Boards back in the 1960s using a variety of methods
including photolithography, toner transfer, PC layout tape, and
special ink pens. The problem with all of these methods is you can
realistically only do single sided boards.

I worked out a way to do double sided boards but I first had to design
and build a very accurate jig to hold the boards and the photomasks in
perfect alignment under hot lights for several minutes. Even with all
that, there was still no way to do plated through holes. In most cases
I was clever enough to make the connections from one side of the board
to the other by carefully choosing where the via was located so it
corresponded to where a part would be placed. Then the lead from the
part or IC did double duty by acting as a via.

If you want to do a PC Board today it seems to me that a better use of
your time would be ExpressPCB which has free software. It is a
do-it-yourself solution to PCB layout but they can handle up to 4
layer boards with vias, and they do silk screen layers on the top, and
(I think) the bottom as well. A big plus is you can learn it quickly
but it doesn't do much more than board layout. The biggest drawback is
you have to buy your boards from them and you have to buy 4 boards at
a time. Prices are reasonable. (I have no financial connection with them).

Dennis Tillman W7PF

-----Original Message-----
Sent: Monday, March 07, 2016 5:52 PM
Subject: Re: [TekScopes] MAKING EXCELLENT PCBs using toner transfer

Their website is http://www.pulsarprofx.com

Regards,

Dave Casey

On 3/7/2016 7:13 PM, gmt1@... [TekScopes] wrote:

Hi Folks,
You can make PCB boards of the highest quality using the toner
transfer method.
The secret is to use Pulsar’s Transfer Paper and Pulsar’s Green TRF
Foil (both products made in the US) and a modified laminator .Pulsar
products are sold worldwide i gather.

Use Ferric chlorides etchant.
I have no connection with Pulsar (just a happy customer)

I struggled for years to make decent PCBs and this is by far the
best DIY system avaliable.
You can produce boards that match Photographic methods and make very
fine tracks.
All electronic enthusiast should be able to make there own PCBs and
produce there own TEK

extender boards relatively cheaply.
Not a lot of info on Pulsar,on the net, for some reason but i found
this excellent writeup from a local mob here in Australia see......
http://ultrakeet.com.au/write-ups/makepcbs
http://ultrakeet.com.au/write-ups/makepcbs
Regards
George












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Posted by: Dave Casey <dcasey@...>
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