There is no such thing as a brass pcb.
People etch thin sheets of brass for making models. For example:
http://www.etched-brass.scale-train.com/EBNFARMWINDMILL_windmill-3.php-Sebastien Bailard
RepRap.org - self-reproducing 3D printer project
On Thursday 01 March 2007 09:47, otc_friend wrote:
> Can you describe what makes brass pcb different from copper pcb? I'm
> wondering if I should switch to brass material. How good is soldering?
>
> regards -
> Henry
>
> www.ehydra.dyndns.info
>
>
> -----Ursprüngliche Nachricht-----
> Von: "garydeal" <garydeal@...>
> An: <Homebrew_PCBs@yahoogroups.com>
> Gesendet: Dienstag, 27. Februar 2007 11:48
> Betreff: [Homebrew_PCBs] Re: cheap UV light sources?
>
> | I use a 500 watt halogen "work light" from the hardware store, $10
> | including an extra bulb stashed in the handle. I also use this chinese
> | dry-film resist (ebay, $40 for way more than I can use before it dies)
> | fed through a $25 laminator from walmart, using the procedures noted at
> | thinktink.com. My contact frame is an old glass-faced photo contact
> | printer, a couple bucks at a thrift store but generally available cheap
> | on fleabay.
> |
> | With the UV-filtering glass and guard assembly flopped out of the way I
> | get a good exposure in about four minutes at ~18 inches. I also avoid
> | eyeball exposure, I figure that UV filter is there for a reason.
> |
> | I generally only do brass, not copper pcb, and I have a darkroom so I can
> | go from a good dark inkjet print to litho film without too terrible much
> | trouble. I ∗have∗ used an inkjet print as the mask (oil the paper with
> | vegetable oil, let soak a while, then keep wiping until dry-ish), takes
> | about twice the exposure and requires testing - produces slightly rough
> | edges. I'm going to need to make a pcb or two soon, so I expect this
> | experience will come in handy.
> |
> | -Gary
> |
> | > Can someone please recommend a UV lighting source which:
> | > - is cheap
> | > - has consistent UV output
> | > - is readily available, or easily made up from items from general
> | > hardware stores
> | > - gives good results with low exposure time (preferably 5-10 mins,
> | > I'm not keen on 30 minutes)
> |
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> |
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