Homebrew PCBs

Hi ,The picture of the lamp in the instructions looks like a sunlamp (UV) 
type of lamp by the shape. There is no description as to what the film is 
sensitive to, every resist I have seen used over the last 30 years has been 
UV sensitive.
Don VK3YV
----- Original Message ----- 
From: "pixelcanvas" <pixelcanvas@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Saturday, October 11, 2008 12:50 PM
Subject: [Homebrew_PCBs] Re: Dry film woes, maybe the developer is at fault?


> --- In Homebrew_PCBs@yahoogroups.com, "warrenbrayshaw"
> <warrenbrayshaw@...> wrote:
>>
>> "pixelcanvas"  wrote:
>> >
>>
>> > The stuff I'm testing is this:
>> > http://www.es.co.th/Detail_eng.asp?Prod=WARA%2DDRYFILM
>> >
>> > I get it locally (I live in Bangkok), and unfortunately the
>> > instructions are in Thai... my girlfriend helped me out with it but I
>> > still think there may be something wrong with them...
>> >
>>
>> As this appears to be Wara product try the manufacturers web site to
>> confirm your translation was correct.
>>
>> http://www.warapcb.com/dryfilm.php
>>
>> All the best
>
> Yes, the translation is correct, but I have serious dubts about it's
> usefulness. For example it does say to use a 100W light bulb for 15
> minutes to expose the film, and I know for a fact that is way too
> little time. So I think I should take those instructions with a pretty
> large grain of salt...
>
> Harvey, I think what you are saying about the bottom of the film not
> being exposed may be correct.
> I'm going to try to get an UV light, and expose a test board at
> different times, I'll place a piece of cardboard over it and move it
> to the side every 15 minutes or so to expose more of the board. Then
> I'll see what exposure time works best.
>
> Thanks  lot for the suggestions so far.
>> Warren
>>
>
>
>
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>
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