Homebrew PCBs

On 12/05/2013 15:07, dave_donlan wrote:
> Hi guys
> I am using UV exposure method on clear acetate
>
> 15 secs exposure caustic soda developer about a 60 secs
>
> hydrochloric acid / peroxide etchant no bubbler just sloshing about but
> the problem is the protective layer is coming off after a few minuets of
> etching
>
> hydrochloric is 30%
> peroxide is 9%

Use a test strip with a range of exposure times to get the correct exposure.

Leon
-- 
Leon Heller
G1HSM