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PICList Thread
'UV Erase'
1998\10\13@085613 by Radboud Verberne

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face
Hi,

I've recently bought a windowed 16c62a. But with my mother's face solarium
it takes 3 hours to empty the PIC. I've mounted the PIC against one of the
four tubes which are 8 watt types. Why does this takes so long? Not the
right wavelength? Or because the UV-A and the UV-B are filtered out?

In the catalogus of Conrad (only in Holland and Germany) they sell 12volt 4
watt tubes for almost 20 dollars! A normal solarium type (8w) is only 11
dollars. why this great difference in pricing?

Greetz Radboud Verberne
PE1RUH

1998\10\13@104242 by paulb

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Radboud Verberne wrote:

> But with my mother's face solarium it takes 3 hours to empty the PIC.
> I've mounted the PIC against one of the four tubes which are 8 watt
> types.  Why does this takes so long?  Not the right wavelength?
> Or because the UV-A and the UV-B are filtered out?

 Sort of.  Actually, because the *UV-C* is filtered out.  Otherwise it
would do *even more* damage to your mother's face than it already is!
(No smiley; I'm not joking.)

> In the catalogues of Conrad (only in Holland and Germany) they sell
> 12volt 4 watt tubes for almost 20 dollars! A normal solarium type (8w)
> is only 11 dollars.  Why this great difference in pricing?

 It's called "marketing".  How many eraser tubes do they sell?  How
many solarium tubes?  What's it worth to have the tubes sitting on the
shelf for long periods of time?

 Hint; the larger tubes are often *cheaper* because they have more
common use in water sterilisers etc.  Specify the "germicidal", *non*-
filtered type.  You will likely find a 20W tube as cheap as a small one.
Some say you don't want that as you are making much more UV-C that you
must keep out of your eyes/ off your skin; I am merely mentioning cost
factors.
--
 Cheers,
       Paul B.

1998\10\13@123907 by Gustaf Tham

picon face
Hello Radboud,

Be glad it doesn't work, or your sunlamp would be an old quarz-lamp,
which is definitely not healthy for sunbathing, giving I think 256 nm
UVB.
If you look at your tubes they are probably marked UVA, or possibly UVAB.
It goes like this:

Visible:    400-800nm. Long waves = low energy.
Blacklite   Low energy part of UVA
UVA:        315-400nm Gives you a nice tan(after initiation with UVB)
UVB:        280-315nm Major component of sunlight - also most harmful.
UVC:        200-280nm Does not penetrate the atmosphere.

What you want for erasing EPROMS is UVC.   Often used is 253nm = 2537E,
I think that's the wavelength you get when excited mercury atoms return
to an unexcited state.  These lamps are clear, and you can see small
drops of mercury inside. You buy them as... Eprom erasers! Sorry.
For a low budget: I think an old quarz sunlamp would work.

If you start manufacturing circuit-boards you can use your UVA sunlamp
for exposure - here the recommended wavelength is 350-370nm.

Best regards,

Gustaf                            spam_OUTgusTakeThisOuTspamalgonet.se

RV> Hi,

RV> I've recently bought a windowed 16c62a. But with my mother's face solarium
RV> it takes 3 hours to empty the PIC. I've mounted the PIC against one of the
RV> four tubes which are 8 watt types. Why does this takes so long? Not the
RV> right wavelength? Or because the UV-A and the UV-B are filtered out?

RV> In the catalogus of Conrad (only in Holland and Germany) they sell 12volt 4
RV> watt tubes for almost 20 dollars! A normal solarium type (8w) is only 11
RV> dollars. why this great difference in pricing?

RV> Greetz Radboud Verberne
RV> PE1RUH

1998\10\14@114850 by Dr. Imre Bartfai

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On Tue, 13 Oct 1998, Radboud Verberne wrote:

> Hi,
>
> I've recently bought a windowed 16c62a. But with my mother's face solarium
> it takes 3 hours to empty the PIC. I've mounted the PIC against one of the
> four tubes which are 8 watt types. Why does this takes so long? Not the
> right wavelength? Or because the UV-A and the UV-B are filtered out?
>
> In the catalogus of Conrad (only in Holland and Germany) they sell 12volt 4
> watt tubes for almost 20 dollars! A normal solarium type (8w) is only 11
> dollars. why this great difference in pricing?
>
> Greetz Radboud Verberne
> PE1RUH
>

Hi,

I bought a complete eraser device (including timer circuit, a nice
alumininum case, and all fancy stuff) from Conrad for 99,- DM . It works
from 12V DC and I find it great. One buys it only once...

Imre

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