Homebrew PCBs

On 29/08/2014 12:25, mattmoose1969@... [Homebrew_PCBs] wrote:
> Hi all,
>
> I am experiencing a problem when developing a UV-sensitive PCB type
> AA16, made by CIF, available from RS Components as stock number 159-6057.
>
> I mentioned this in my last post to this group, and have now made an
> exposure test from 1-10mins just to see more what's going on.
>
> My problem is that it is difficult to remove all of the exposed etch
> resist layer reliably, at almost every exposure level. I'm using Sodium
> Metasilicate universal developer, RS stock number 690-849, in a
> hand-agitated plastic developing tray.

How are you making the transparency? Does it have enough contrast?

Leon
-- 
Leon Heller
G1HSM