Homebrew_PCBs

Has anyone got any idea of the suitability of the scanner lamp for pcb exposure.
If ok I was planning on positioning the lamp further away from the glass and using reflectors to spread the light

Any help greatfully accepted
Dave

On 23/02/2013 16:49, dave_donlan wrote:

> Has anyone got any idea of the suitability of the scanner lamp for pcb
> exposure.
> If ok I was planning on positioning the lamp further away from the glass
> and using reflectors to spread the light

You need UV lamps (long wave for positive resist)!

Leon
--
Leon Heller
G1HSM

>
>
>You need UV lamps (long wave for positive resist)!
>
>Leon
>--
>Leon Heller
>G1HSM

405nm?
Cristian

> >You need UV lamps (long wave for positive resist)!
> >
> >Leon
> >--
> >Leon Heller
> >G1HSM
>
> 405nm?
> Cristian

About that, some boards need closer to 370nm. That's in the UVA band. The
germicidal ones are UVC (200nm-ish).

The UV LEDs you can buy are usually around 400nm or so, which is why they
work. I've seen shorter wavelength ones, but they were a bit $$$. Those
little nail polish curing lamps are probably the cheapest (off eBay).

Tony

Thanks all

--- In Homebrew_PCBs@yahoogroups.com, "Tony Smith" <ajsmith1968@...> wrote:
>
> > >You need UV lamps (long wave for positive resist)!
> > >
> > >Leon
> > >--
> > >Leon Heller
> > >G1HSM
> >
> > 405nm?
> > Cristian
>
>
> About that, some boards need closer to 370nm. That's in the UVA band. The
> germicidal ones are UVC (200nm-ish).
>
> The UV LEDs you can buy are usually around 400nm or so, which is why they
> work. I've seen shorter wavelength ones, but they were a bit $$$. Those
> little nail polish curing lamps are probably the cheapest (off eBay).
>
> Tony
>