Homebrew PCBs

Cheers,

My resist is green and I have found that 9 minutes is getting close.
Some areas are really good with well defined tracks, some areas are still
lost in the green haze.
More practice I guess.

Daryl.


----- Original Message ----- 
From: "Leon Heller" <leon.heller@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Tuesday, April 04, 2006 8:20 PM
Subject: Re: [Homebrew_PCBs] Making the PCB


> ----- Original Message ----- 
> From: "LogicResearch" <logicresearch@...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Tuesday, April 04, 2006 8:22 AM
> Subject: [Homebrew_PCBs] Making the PCB
>
>
>> Ok,
>>
>> Now I have my chemicals and PCB etc, it's time to experiment with making
>> the
>> boards.
>>
>> I'm using photo resist and developer etc - should I just experiment with
>> times or does somebody have a good suggestion.
>
> The development is easy, just make sure you have the right concentration
> and
> you can see when the resist has been removed - it turns purple in the
> solution. It only takes about 30 seconds or so for me with NaOH.
>
> For the UV exposure you need to experiment. Best way is to use a technique
> like the test strip used in photography and make a test pattern. Put the
> pattern and PCB in the UV exposure unit and move a cardboard mask across
> every minute and see what exposure gives the best results. I use 13
> minutes
> but I've only got two tubes and they are quite far from the glass.
>
> Leon
> --
> Leon Heller, G1HSM
> leon.heller@...
> http://www.geocities.com/leon_heller
>
>
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