Homebrew PCBs

It's very uniform and highly collimated, but is it strong enough?

It is referenced in the links, but take a look at 

http://www.prototrains.com/etch1/etch1.html
http://www.prototrains.com/etch2/etch2.html

The etch2 page has a comment about use of the sun. Based on that I
think the sun should work just fine.


--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:

>
> 
> It's very uniform and highly collimated, but is it strong enough?
>

You Have Got To Be Kidding!!!

Roland F. Harriston, PD


DJ Delorie wrote:

>
>
> It's very uniform and highly collimated, but is it strong enough?
>
>

"javaguy11111" <javaguy11111@...> writes:
> http://www.prototrains.com/etch1/etch1.html
> http://www.prototrains.com/etch2/etch2.html

Thanks!

Exactly!

How is this supposed to work when i need to make a board at midnight? ;-)

Anyone got the figures on moonlight exposure times?

ST

On Jan 28, 2008 5:38 AM, Roland F. Harriston <rolohar@...> wrote:

> You Have Got To Be Kidding!!!
>
> Roland F. Harriston, PD
>

"How is this supposed to work when i need to make a board at midnight? ;-)"

Take a flight to the otherside of the planet ....

I used something like 10 minutes which was, I guess to long time. Then of course it was mid winter with a very low set sun.

Magnus

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

On Mon, 28 Jan 2008 10:39:37 +0100, you wrote:

>Exactly!
>
>How is this supposed to work when i need to make a board at midnight? ;-)
>
>Anyone got the figures on moonlight exposure times?

Time to dawn plus the normal exposure times for dim sunlight.

Harvey

>
>ST
>
>
>On Jan 28, 2008 5:38 AM, Roland F. Harriston <rolohar@...> wrote:
>
>> You Have Got To Be Kidding!!!
>>
>> Roland F. Harriston, PD
>>

Probably.

One could make an exposure meter which integrates up with the same
sensitivity as the resist.

I'll stick to toner transfer, with the weather like it is now i'd have
too many delays ;-)

ST

On Jan 28, 2008 4:59 PM, Harvey White <madyn@...> wrote:
> On Mon, 28 Jan 2008 10:39:37 +0100, you wrote:
>
> >Exactly!
> >
> >How is this supposed to work when i need to make a board at midnight? ;-)
> >
> >Anyone got the figures on moonlight exposure times?
>
> Time to dawn plus the normal exposure times for dim sunlight.
>
> Harvey

Frankly Stefan, is the Toner Transfer Method (TTM) working as good as any other kind of method? I have a laser printer but also on rare occassions a little sunlight ....
I tried to iron topner transfer on a piece of aluminium sheet and that worked .. almost, but I do not want to throw a way lots of PCBs ...

Magnus

  ----- Original Message ----- 
  From: Stefan Trethan 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Monday, January 28, 2008 5:27 PM
  Subject: Re: [Homebrew_PCBs] Sunlight as a UV source?


  Probably.

  One could make an exposure meter which integrates up with the same
  sensitivity as the resist.

  I'll stick to toner transfer, with the weather like it is now i'd have
  too many delays ;-)

  ST

  On Jan 28, 2008 4:59 PM, Harvey White <madyn@...> wrote:
  > On Mon, 28 Jan 2008 10:39:37 +0100, you wrote:
  >
  > >Exactly!
  > >
  > >How is this supposed to work when i need to make a board at midnight? ;-)
  > >
  > >Anyone got the figures on moonlight exposure times?
  >
  > Time to dawn plus the normal exposure times for dim sunlight.
  >
  > Harvey


   

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

It is very rare that i have to re-do a transfer, certainly less than
5%. Even then it is not a matter of throwing out the board, just
removing the toner and repeating the transfer. The most trouble i
currently have is with the printer. It makes dark lines on the paper
and in other areas there is only light toner. Probably need to replace
the toner and drum unit, but it is so expensive i might as well get
another printer ;-)

ST

On Jan 28, 2008 6:06 PM, Huggermugger <yahell@...> wrote:
> Frankly Stefan, is the Toner Transfer Method (TTM) working as good as any other kind of method? I have a laser printer but also on rare occassions a little sunlight ....
> I tried to iron topner transfer on a piece of aluminium sheet and that worked .. almost, but I do not want to throw a way lots of PCBs ...
>
> Magnus
>

----- Original Message ----- 

From: "DJ Delorie" <dj@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Monday, January 28, 2008 4:40 AM
Subject: [Homebrew_PCBs] Sunlight as a UV source?


>
> It's very uniform and highly collimated, but is it strong enough?

Depends where you are. I've hear of people using it successfully in 
California but I don't think it will work very well in the UK.

Leon
--
Leon Heller
Amateur radio call-sign G1HSM
Yaesu FT-817ND and FT-857D transceivers
Suzuki SV1000S motorcycle
leon355@...
http://www.geocities.com/leon_heller

--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
> 
> It's very uniform and highly collimated, but is it strong enough?
>
I may have got lucky a couple of years ago. I used an old overhead 
projector with the original lamp installed as the exposure lamp / box. 
I placed the transparency on the projector, then the presentised 
circuit board and finally a book to hold it all down. I think I exposed 
the circuit board for 30 seconds and developed it. It came out perfect. 
I did learn a speck of dust also gets exposed into the pattern but an 
Xacto knife rimmed that away easily.

The first PC Board one I did using the Overhead projector, I had too 
much developer and saw the pattern develop then wash away. 

Gary K8IZ