[chbot] PCBs update

[David Closey]

Russell

What a Fantastic method 
Sorry I also missed the talks this month
I have played with all sorts of methods over the years including dry film of late 

Although commercial PCB’s are quite affordable now 
It is very satisfying to be able to knock up a prototype from idea to board in a weekend 
I’m definitely going to try the method you describe

What is the source of the photo resist ??
I had a quick google "PER-20” but nothing popped up


David Closey 




> On 22/10/2020, at 17:43, Volker Kuhlmann <list57 at top.geek.nz> wrote:
> 
> On Thu 22 Oct 2020 08:57:56 NZDT +1300, Russell & Heather Phillips wrote:
> 
> [...]
> 
> That sounds all very interesting. Sorry I missed the talk.
> 
> Would you be able to give some dimensions of details that can be
> achieved with this method?
> 
> It looks very similar to what we did in the
> 1980s at home, although without machinery like lathes. We dropped
> iron(III)chloride for etching in favour of sodiumhydroxide (I think, not
> totally sure any more now). It's also possible we added a little
> hydrochloric acid. It was less of a mess than ironchloride and perhaps a
> little safer.
> 
> Recently I heard some artists warn that etching metal with those kind of
> chemicals does eventually erode your teeth. That might be plausible when
> breathing the vapours and having a dry mouth, so ventilation and
> drinking (not the etching solution) might be wise.
> 
> Volker
> 
> -- 
> Volker Kuhlmann
> http://volker.top.geek.nz/	Please do not CC list postings to me.
> 
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