On Sat, 23 Feb 2013 10:41:43 -0000, you wrote:
>I don't think so, I think the wavelength is wrong, exposure won't work or won't work properly.
You used Germicidal (bare) lamps with the old Kodak KPR chemistry, a
negative resist.
Current positive films need near UV and longwave UV (IIRC).
NEVER LOOK AT A GERMICIDAL LAMP DIRECTLY
Never look at it except through a red filter that does not pass UV at
all. The wavelength breaks apart proteins in your eyes (and germs)
and can severely damage or destroy your sight.
You can find the specs on what your resist needs, and find UV or the
like fluorescents to do the same. The UV leds are still a bit
dangerous, so do not look at them directly, but they are not as nasty.
Harvey
>
>Never mind that they are much more dangerous for your eyes etc!!
>
>I've been using UV LEDs. Seem to work just fine...
>
>
>
>--- In Homebrew_PCBs@yahoogroups.com, Hari Hendaryanto <hari.h@...> wrote:
>>
>
>> back to topic, can i use germicidal UV tl? the one that has transparent
>> tube.
>>
>> TIA
>>
>> regards
>> hari
>>
>> about exposure box i've made, my friend built the box for me, i've just do
>> On 2/23/2013 6:19 AM, Harvey White wrote:
>> >
>> > On Fri, 22 Feb 2013 09:13:43 -0700, you wrote:
>> >
>> > >Hari,
>> > >
>> > >I am fascinated with the ATTiny85 (computer system on a chip and cost
>> > under
>> > >$1) but refuse to take the leap until I can find a really cool
>> > application.
>> > >Recently I thought I had one but then realized I could do the same
>> > function
>> > >with a 25 cent quad op amp and a few passive components. The cost was
>> > half
>> > >of the ATTiny :-(
>> >
>> > Exposure timer. Exposure timer (if it has an a/d) with sensitivity to
>> > exposure.
>> >
>> > Do it because it's neat. You're talking about a 50 cent difference
>> > (but not really) in hardware cost, but you're talking versatility.
>> >
>> > It's a hobby, do it because it can be fun. That's what hobbies are
>> > for, to allow you to spend the money without really having to justify
>> > it.... (just the total expenditure).
>> >
>> > Harvey
>> >
>> > >
>> > >Rick
>> > >
>> > >-----Original Message-----
>> > >From: Homebrew_PCBs@yahoogroups.com
>> > <mailto:Homebrew_PCBs%40yahoogroups.com>
>> > [mailto:Homebrew_PCBs@yahoogroups.com
>> > <mailto:Homebrew_PCBs%40yahoogroups.com>]
>> > >On Behalf Of Hari Hendaryanto
>> > >Sent: Friday, February 22, 2013 9:09 AM
>> > >To: Homebrew_PCBs@yahoogroups.com
>> > <mailto:Homebrew_PCBs%40yahoogroups.com>
>> > >Subject: Re: [Homebrew_PCBs] DIY pcb exposure box UV tl
>> > >
>> > >
>> > >Hi rick,
>> > >
>> > >New url is okay. I'll check if it's(or equivalent) available on my local
>> > >suplier
>> > >
>> > >Yes you were right about how people build things. It's just a matter of
>> > >personal taste.;)
>> > >
>> > >Reason why I'm using proc, because I already have it and not using for
>> > >anything.
>> > >
>> > >Thanks for your response
>> > >Regards
>> > >Hari
>> > >
>> >
>> >
>>
>>
>>
>> [Non-text portions of this message have been removed]
>>
>