WTB: Low cost UV EPROM eraser with timer

[Commander Dave]

Lost most of my electronic equipment <insert long sob story here> and am
looking for someone that has an old UV EPROM eraser they would like to part
with cheap. It needs to be working and have a timer. Please email to
[email protected].

Thanks!
-Commander Dave

 

[Robert Baer]

Lost most of my electronic equipment <insert long sob story here> and am
looking for someone that has an old UV EPROM eraser they would like to part
with cheap. It needs to be working and have a timer. Please email to
[email protected].

Thanks!
-Commander Dave

Use a standard fluroescent lamp; for more UV, replace the bulb with a
UV bulb.
Get a timer at an electrical store.

 

[Heinz Lenk]

Lost most of my electronic equipment <insert long sob story here> and am

Take the tube of a sun-ray lamp (from a fleemarked) and connect it via
a 1N4007 diode to a 30V power supply with current limiting set to 1A.
Start the tube with 250V DC in series with a 10kOhm/5W resistor.
The diode will prevent the 30V-power supply from beeing zapped.
The ark will burn with ca. 22V and you will smell ozone .
Remove the 250V.
Cool the tube with a fan to prevent the arc-voltage to jump to 80V
(normal condition).
EPROM erasure takes 15 minutes.

Heinz Lenk

 

[Rich.Andrews]

[email protected] (Heinz Lenk) wrote in

Take the tube of a sun-ray lamp (from a fleemarked) and connect it via
a 1N4007 diode to a 30V power supply with current limiting set to 1A.
Start the tube with 250V DC in series with a 10kOhm/5W resistor.
The diode will prevent the 30V-power supply from beeing zapped.
The ark will burn with ca. 22V and you will smell ozone .
Remove the 250V.
Cool the tube with a fan to prevent the arc-voltage to jump to 80V
(normal condition).
EPROM erasure takes 15 minutes.

Heinz Lenk

I have used a fluorescent UV germicidal bulb. Takes a while but it gets
the job done. Dont forget to short out the prom pins with something
conductive while erasing.

r

 

[John Miles]

Dont forget to short out the prom pins with something
conductive while erasing.

I haven't heard this before. What's the reasoning?

-- jm

 

[Rich.Andrews]

I haven't heard this before. What's the reasoning?

-- jm

To be honest, I am not sure why. I have had issues when I did not have
the prom in a conductive carrier while erasing. Now that I think about
it, it could be just an old wives tale. All of the prom erasings units I
checked have a conductive tray.

r

 

[Mark (UK)]

Hi!

I've got a Stag SE15 and that doesn't have any conductive material in
the tray - trust it to be awkward

It's got slots where the IC legs sit in a flat metal tray.

Yours, Mark.

 

[Mark Zenier]

Use a standard fluroescent lamp; for more UV, replace the bulb with a
UV bulb.

That would be pretty damn necessary. Here's three datapoints from
my experience.

A G15T8 Germicidal lamp in an $8 below the shelf fixture, 3 minutes.
A tanning bed lamp 45 minutes.
A blue filter /BLB "poster lamp", 3 1/2 DAYS. (2716/2764 vintage EPROMS).

The BLB (and BL) lamps are UV enhanced with a peak at 350 nanometers,
so an ordinary fluorescent lamp would take bloody forever.

Tanning lamps peak at 300 nanometers or thereabouts, a Germicial has a
strong mercury line at 258 nanometers.

Get a timer at an electrical store.

Probably most convenient would be to get a G8T5, (or G6T5, depending) lamp
that will fit in slimline fixtures or a battery powered safari light,
or a G4T5 that will fit into (I think) those plug in the wall night
lights. Probably $30, single quantity, at a specialty lamp supplier.
Maybe cheaper at a barbers' supply or aquarium supply store. Or E-Bay.

Mark Zenier [email protected] Washington State resident

 

[Commander Dave]

Thanks for all the advice, but I really didn't want to build one. I wound up
getting a very cheap one on Ebay for $10.

Cheers!
-Commander Dave