pretty clean. Some pinholing and a few trace blooms but very
respectable. The trace blooms are due to too much pressure, by the
way. With an iron, it's very very hard to avoid.
I'm suprised that the pulsar process has pinholes. Guess it's just
toner transfer with pricey paper.
--- In
Homebrew_PCBs@yahoogroups.com, "lcdpublishing"
<lcdpublishing@y...> wrote:
> Hi all,
>
> WOW, what a difference a little bit of practice makes and a new
> etching tank. I posted images of my latest attempt in the files
> section - root directory.
>
> NewEtching.jpg
>
> Process outline...
>
> Designed in PCB Wizard
> Printed on Pulsar paper using HP laserjet 6p
> Transferred with iron, two 15 second pressings @ 360 degrees F
> Etched in ferric Chloride, warm, with air bubbles.
> Wiped off toner with Acetone
>
> And that is what you see. Next up, I will try the tinning process
> using solder paste as outlined here about a week or so ago.
>
> I am amazed at how much better these came out compared to my
> previous attempts.
>
> The change in transfer was shorter pressing time (was about 90
> seconds or more) and perhaps a bit less heat, didn't measure temp
> last time. Also, made sure to re-position iron during pressing so
> as to make sure the steam vent hole areas would be re-pressed with a
> different part of the iron sole.
>
> I used ferric chloride last time, but in a small tray with gentle
> rocking for agitation. This time, the tank is much larger 1/2
> gallon and am using fish tank bubblers for agitation.
>
> Chris