Homebrew_PCBs

hi guys,

just to make sure i'm on the right track, while i'm waiting for my dry
film, i wanna ask some favour. i'm deploying compact PCB uv exposure box
( not 100% done yet) . as you can see in this url.

http://img17.imageshack.us/img17/4035/tebet2013022200232.jpg

is the UV lamp i'm using the right type. i bought cheap (~ $3 each) 2 UV
lamps from local hardware/electrical store. it doesn't have any
technical specification,.just black light tube.

thanks in advance

regards

hari

Hari,

VERY fancy exposure box.

Being a minimalist, I bought two of these

http://www.walmart.com/ip/Lights-of-America-24-Fluorescent-Blacklight-Fixtur
e/16879944

for about $12 each including tax. I bolted a thin bar across the top of each
side to yoke the two fixtures together. Then I put the assembly on 2.5" tall
spacers. Works fine for me. I expose my pre-coated boards for 8 minutes,
develop in under 20 seconds, and etch in warm ferric chloride in under 10
minutes.

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Hari Hendaryanto
Sent: Friday, February 22, 2013 6:48 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] DIY pcb exposure box UV tl

hi guys,

just to make sure i'm on the right track, while i'm waiting for my dry film,
i wanna ask some favour. i'm deploying compact PCB uv exposure box ( not
100% done yet) . as you can see in this url.

http://img17.imageshack.us/img17/4035/tebet2013022200232.jpg

is the UV lamp i'm using the right type. i bought cheap (~ $3 each) 2 UV
lamps from local hardware/electrical store. it doesn't have any technical
specification,.just black light tube.

thanks in advance

regards

hari






------------------------------------

Be sure to visit the group home and check for new Links, Files, and Photos:
http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links

hi, rick thanks for your quick response

On 2/22/2013 9:06 PM, Rick Sparber wrote:
>
> Hari,
>
> VERY fancy exposure box.
>
it's just a wooden box with avr(atmega8535L) module to set the timer,
LOL :D

>
> Being a minimalist, I bought two of these
>
> http://www.walmart.com/ip/Lights-of-America-24-Fluorescent-Blacklight-Fixtur
> e/16879944
>
this link not work for. it's said " product not found"

> for about $12 each including tax. I bolted a thin bar across the top
> of each
> side to yoke the two fixtures together. Then I put the assembly on
> 2.5" tall
> spacers. Works fine for me. I expose my pre-coated boards for 8 minutes,
> develop in under 20 seconds, and etch in warm ferric chloride in under 10
> minutes.
>
what about reflector and what kind of material suitable for it? is it
needed?

>
> 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 6:48 AM
> To: Homebrew_PCBs@yahoogroups.com <mailto:Homebrew_PCBs%40yahoogroups.com>
> Subject: [Homebrew_PCBs] DIY pcb exposure box UV tl
>
> hi guys,
>
> just to make sure i'm on the right track, while i'm waiting for my dry
> film,
> i wanna ask some favour. i'm deploying compact PCB uv exposure box ( not
> 100% done yet) . as you can see in this url.
>
> http://img17.imageshack.us/img17/4035/tebet2013022200232.jpg
>
> is the UV lamp i'm using the right type. i bought cheap (~ $3 each) 2 UV
> lamps from local hardware/electrical store. it doesn't have any technical
> specification,.just black light tube.
>
> thanks in advance
>
> regards
>
> hari
>



[Non-text portions of this message have been removed]

Hari,

The line broke. Try this

<http://www.walmart.com/ip/Lights-of-America-24-Fluorescent-Blacklight-Fixtu
re/16879944>

We all have different reasons to make things. If you wish to use a processor
to set the exposure time, I think that is wonderful. I recently spent a few
hours building a punch that could have been bought at Staples for $4. It is
a hobby so there is no need to justify the effort.

I have no enclosure and no reflectors. Just two bare bulbs hung 2.5" above
the board being exposed.

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Hari Hendaryanto
Sent: Friday, February 22, 2013 7:12 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] DIY pcb exposure box UV tl

hi, rick thanks for your quick response

On 2/22/2013 9:06 PM, Rick Sparber wrote:
>
> Hari,
>
> VERY fancy exposure box.
>
it's just a wooden box with avr(atmega8535L) module to set the timer, LOL
:D

>
> Being a minimalist, I bought two of these
>
> http://www.walmart.com/ip/Lights-of-America-24-Fluorescent-Blacklight-
> Fixtur
> e/16879944
>
this link not work for. it's said " product not found"

> for about $12 each including tax. I bolted a thin bar across the top
> of each side to yoke the two fixtures together. Then I put the
> assembly on 2.5" tall spacers. Works fine for me. I expose my
> pre-coated boards for 8 minutes, develop in under 20 seconds, and etch
> in warm ferric chloride in under 10 minutes.
>
what about reflector and what kind of material suitable for it? is it
needed?

Just outta curiosity, does that Lights of America fixture
produce RFI? (I.e., radio interferrence).

Thanks,
Charlie

On Fri, 22 Feb 2013 07:06:52 -0700 "Rick Sparber" <rgsparber@...>
writes:

Hari,

VERY fancy exposure box.

Being a minimalist, I bought two of these

http://www.walmart.com/ip/Lights-of-America-24-Fluorescent-Blacklight-Fix
tur
e/16879944

for about $12 each including tax. I bolted a thin bar across the top of
each
side to yoke the two fixtures together. Then I put the assembly on 2.5"
tall
spacers. Works fine for me. I expose my pre-coated boards for 8 minutes,
develop in under 20 seconds, and etch in warm ferric chloride in under 10
minutes.

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com
[mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Hari Hendaryanto
Sent: Friday, February 22, 2013 6:48 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] DIY pcb exposure box UV tl

hi guys,

just to make sure i'm on the right track, while i'm waiting for my dry
film,
i wanna ask some favour. i'm deploying compact PCB uv exposure box ( not
100% done yet) . as you can see in this url.

http://img17.imageshack.us/img17/4035/tebet2013022200232.jpg

is the UV lamp i'm using the right type. i bought cheap (~ $3 each) 2 UV
lamps from local hardware/electrical store. it doesn't have any technical
specification,.just black light tube.

thanks in advance

regards

hari

------------------------------------

Be sure to visit the group home and check for new Links, Files, and
Photos:
http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links




[Non-text portions of this message have been removed]

I suspect it generates as much RFI as any fluorescent fixture. I use it in
my shop which has 1 KW of fluorescent fixtures. They make it near impossible
to play a radio. Fortunately, I don't listen to radio in my shop.

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Missouri Guy
Sent: Friday, February 22, 2013 8:21 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] DIY pcb exposure box UV tl

Just outta curiosity, does that Lights of America fixture produce RFI?
(I.e., radio interferrence).

Thanks,
Charlie

On Fri, 22 Feb 2013 07:06:52 -0700 "Rick Sparber" <rgsparber@...>
writes:

Hari,

VERY fancy exposure box.

Being a minimalist, I bought two of these

http://www.walmart.com/ip/Lights-of-America-24-Fluorescent-Blacklight-Fix
tur
e/16879944

for about $12 each including tax. I bolted a thin bar across the top of each
side to yoke the two fixtures together. Then I put the assembly on 2.5"
tall
spacers. Works fine for me. I expose my pre-coated boards for 8 minutes,
develop in under 20 seconds, and etch in warm ferric chloride in under 10
minutes.

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com
[mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Hari Hendaryanto
Sent: Friday, February 22, 2013 6:48 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] DIY pcb exposure box UV tl

hi guys,

just to make sure i'm on the right track, while i'm waiting for my dry film,
i wanna ask some favour. i'm deploying compact PCB uv exposure box ( not
100% done yet) . as you can see in this url.

http://img17.imageshack.us/img17/4035/tebet2013022200232.jpg

is the UV lamp i'm using the right type. i bought cheap (~ $3 each) 2 UV
lamps from local hardware/electrical store. it doesn't have any technical
specification,.just black light tube.

thanks in advance

regards

hari

------------------------------------

Be sure to visit the group home and check for new Links, Files, and
Photos:
http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links




[Non-text portions of this message have been removed]



------------------------------------

Be sure to visit the group home and check for new Links, Files, and Photos:
http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links

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

-------Original Message-------
From: Rick Sparber [rgsparber@...]
Date: Fri, Feb 22, 2013
To: [Homebrew_PCBs@yahoogroups.com]
Reply To: [Homebrew_PCBs@yahoogroups.com]
Subject: RE: [Homebrew_PCBs] DIY pcb exposure box UV tl

Hari,

The line broke. Try this

http://www.walmart.com/ip/Lights-of-America-24-Fluorescent-Blacklight-Fixtu
re/16879944>

We all have different reasons to make things. If you wish to use a processor
to set the exposure time, I think that is wonderful. I recently spent a few
hours building a punch that could have been bought at Staples for $4. It is
a hobby so there is no need to justify the effort.

I have no enclosure and no reflectors. Just two bare bulbs hung 2.5" above
the board being exposed.

Rick

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 :-(

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Hari Hendaryanto
Sent: Friday, February 22, 2013 9:09 AM
To: Homebrew_PCBs@yahoogroups.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

Sound interesting, may I see your schematic if you don't mind

Thanks
Hari

-------Original Message-------
From: Rick Sparber [rgsparber@...]
Date: Fri, Feb 22, 2013
To: [Homebrew_PCBs@yahoogroups.com]
Reply To: [Homebrew_PCBs@yahoogroups.com]
Subject: RE: [Homebrew_PCBs] DIY pcb exposure box UV tl

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 :-(

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Hari Hendaryanto
Sent: Friday, February 22, 2013 9:09 AM
To: Homebrew_PCBs@yahoogroups.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

Hari,

I sent a picture and text via private email. It is a bit OT.

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Hari Hendaryanto
Sent: Friday, February 22, 2013 9:22 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] DIY pcb exposure box UV tl

Sound interesting, may I see your schematic if you don't mind

Thanks
Hari

-------Original Message-------
From: Rick Sparber [rgsparber@...]
Date: Fri, Feb 22, 2013
To: [Homebrew_PCBs@yahoogroups.com]
Reply To: [Homebrew_PCBs@yahoogroups.com]
Subject: RE: [Homebrew_PCBs] DIY pcb exposure box UV tl

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 :-(

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Hari Hendaryanto
Sent: Friday, February 22, 2013 9:09 AM
To: Homebrew_PCBs@yahoogroups.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



------------------------------------

Be sure to visit the group home and check for new Links, Files, and Photos:
http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links

I was afraid of that....
I suspect the "Lights of America" fixtures use an electronic ballast
instead of an inductor/transformer/standard ballast and no filtering
to keep the RF junk out of the AC line. Not good.

Anyway, end of this thread.

Charlie

On Fri, 22 Feb 2013 08:37:55 -0700 "Rick Sparber" <rgsparber@...>
writes:

I suspect it generates as much RFI as any fluorescent fixture. I use it
in
my shop which has 1 KW of fluorescent fixtures. They make it near
impossible
to play a radio. Fortunately, I don't listen to radio in my shop.

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com
[mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Missouri Guy
Sent: Friday, February 22, 2013 8:21 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] DIY pcb exposure box UV tl

Just outta curiosity, does that Lights of America fixture produce RFI?
(I.e., radio interferrence).

Thanks,
Charlie

On Fri, 22 Feb 2013 07:06:52 -0700 "Rick Sparber" rgsparber@...>
writes:

Hari,

VERY fancy exposure box.

Being a minimalist, I bought two of these

http://www.walmart.com/ip/Lights-of-America-24-Fluorescent-Blacklight-Fix
tur
e/16879944

for about $12 each including tax. I bolted a thin bar across the top of
each
side to yoke the two fixtures together. Then I put the assembly on 2.5"
tall
spacers. Works fine for me. I expose my pre-coated boards for 8 minutes,
develop in under 20 seconds, and etch in warm ferric chloride in under 10
minutes.

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com
[mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Hari Hendaryanto
Sent: Friday, February 22, 2013 6:48 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] DIY pcb exposure box UV tl

hi guys,

just to make sure i'm on the right track, while i'm waiting for my dry
film,
i wanna ask some favour. i'm deploying compact PCB uv exposure box ( not
100% done yet) . as you can see in this url.

http://img17.imageshack.us/img17/4035/tebet2013022200232.jpg

is the UV lamp i'm using the right type. i bought cheap (~ $3 each) 2 UV
lamps from local hardware/electrical store. it doesn't have any technical
specification,.just black light tube.

thanks in advance

regards

hari

------------------------------------

Be sure to visit the group home and check for new Links, Files, and
Photos:
http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links

[Non-text portions of this message have been removed]

------------------------------------

Be sure to visit the group home and check for new Links, Files, and
Photos:
http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links




[Non-text portions of this message have been removed]

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@yahoogroups.com]
>On Behalf Of Hari Hendaryanto
>Sent: Friday, February 22, 2013 9:09 AM
>To: Homebrew_PCBs@yahoogroups.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
>

Harvey,

I failed to mention that this particular project is not just part of my
hobby. Someone else is trying to make some money with it. So cost does
matter in this particular case.

Rick

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Harvey White
Sent: Friday, February 22, 2013 4:19 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] DIY pcb exposure box UV tl

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@yahoogroups.com]
>On Behalf Of Hari Hendaryanto
>Sent: Friday, February 22, 2013 9:09 AM
>To: Homebrew_PCBs@yahoogroups.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
>



------------------------------------

Be sure to visit the group home and check for new Links, Files, and Photos:
http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links

On Fri, 22 Feb 2013 16:33:56 -0700, you wrote:

>Harvey,
>
>I failed to mention that this particular project is not just part of my
>hobby. Someone else is trying to make some money with it. So cost does
>matter in this particular case.

Ah, then cost trumps cute unless you can make sexy trump cost.

No problem

Harvey

>
>Rick
>
>-----Original Message-----
>From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
>On Behalf Of Harvey White
>Sent: Friday, February 22, 2013 4:19 PM
>To: Homebrew_PCBs@yahoogroups.com
>Subject: Re: [Homebrew_PCBs] DIY pcb exposure box UV tl
>
>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@yahoogroups.com]
>>On Behalf Of Hari Hendaryanto
>>Sent: Friday, February 22, 2013 9:09 AM
>>To: Homebrew_PCBs@yahoogroups.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
>>
>
>
>
>------------------------------------
>
>Be sure to visit the group home and check for new Links, Files, and Photos:
>http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>

harvey's opinions also true, i spent ~ $50 just for hot air rework
station, because i'm starting dealing using smd part :D ( that was fun)
about the exposure, i asked my friend to make the box (free of charge),
i do the electronics and coding part.( that was fun too)

i think the cost does not matter for me, for my hobby, as long it's not
draining my wallet and at reasonable price, lol.
but it worth to try cheap solution too. i love to try something new. it
all can be fun for me. :)

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]

I don't think so, I think the wavelength is wrong, exposure won't work or won't work properly.

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]
>

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]
>>
>

So germicidal works on negative photoresist and won't work on positiv 20 nor dry film. "need near UV and longwave UV (IIRC)." If I'm understanding this correctly this is mean "near visible light wavelength" right?

Thanks

Hari

-------Original Message-------
From: Harvey White [madyn@...]
Date: Sat, Feb 23, 2013
To: [Homebrew_PCBs@yahoogroups.com]
Reply To: [Homebrew_PCBs@yahoogroups.com]
Subject: Re: [Homebrew_PCBs] Re: DIY pcb exposure box UV tl

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...
>

On Sat, 23 Feb 2013 15:21:55 +0000, you wrote:

>So germicidal works on negative photoresist and won't work on positiv 20 nor dry film. "need near UV and longwave UV (IIRC)." If I'm understanding this correctly this is mean "near visible light wavelength" right?

As I understand it, you're right.

I used the germicidal lamps with the KPR chemistry (negative resist
and relatively nasty stuff) many years ago.

I needed (and got) 6500 degree K lamps for the MG chemicals
presensitized positive resist boards.

I've used blacklight fluorescents (mine had the filter) with the same
MG chemicals/injectorall precoated boards.

As always, you need to make a test exposure strip or expose through a
stepped density filter used to make enlargers work.

Not sure that an enlarger timer would work all that well (the ones
with photocells), but I use an enlarger timer to control the exposure.
Rather convenient.

Harvey

>
>Thanks
>
>Hari
>
>-------Original Message-------
>From: Harvey White [madyn@...]
>Date: Sat, Feb 23, 2013
>To: [Homebrew_PCBs@yahoogroups.com]
>Reply To: [Homebrew_PCBs@yahoogroups.com]
>Subject: Re: [Homebrew_PCBs] Re: DIY pcb exposure box UV tl
>
> 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...
>>
>
>
>------------------------------------
>
>Be sure to visit the group home and check for new Links, Files, and Photos:
>http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>