Homebrew PCBs

----- Original Message ----- 
From: "Harvey White" <madyn@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Monday, October 20, 2008 8:05 PM
Subject: Re: [Homebrew_PCBs] Dry film- negative resist... First attempt 
failure


> On Mon, 20 Oct 2008 15:19:41 -0000, you wrote:
>
>>Hi guys,
>>
>>I tried my first photo process board this weekend and the process
>>failed completely.  I am using the dry film, negative resist from MG
>>chemicals.
>
> Negative resist?  I'm familiar with the positive resist on precoated
> boards.
>>
>>The failure was in the developing of the resist.  While developing,
>>all the resist washed off.  It was developed as I could see the
>>traces in the resist, but faintly.
>>
>>The developer solution was a best guess on dilution so this is
>>probably my main failure point.
>>
>
> probably not.  For the positive resist it's about 10:1 water to
> developer.

I use 12g NaOH to 1l of water.

Leon
--
Leon Heller
Amateur radio call-sign  G1HSM
Yaesu FT-817ND transceiver
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http://www.geocities.com/leon_heller