On 22/02/2012 05:10, tda7000 wrote:
> I didn't mention it before but I did a rudimentary test by covering the
> board with a credit card and exposing a little bit every minute for 7
> minutes (chose that time as I saw a site where someone who made a UV box
> with LEDs say 7 minutes was the maximum they could go before overexposure)
That was the technique I used with my UV exposure unit (tubes). It's
basically the same technique that was used by photographers for many
years, when using an enlarger.
Leon
--
Leon Heller
G1HSM