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WTB: Low cost UV EPROM eraser with timer

Discussion in 'Electronic Equipment' started by Commander Dave, Jul 3, 2004.

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  1. 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

    -Commander Dave
  2. Robert Baer

    Robert Baer Guest

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

    Heinz Lenk Guest

    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
  4. Rich.Andrews

    Rich.Andrews Guest

    (Heinz Lenk) wrote in
    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.

  5. John Miles

    John Miles Guest

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

    -- jm
  6. Rich.Andrews

    Rich.Andrews Guest

    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.

  7. Mark (UK)

    Mark (UK) Guest


    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.
  8. Mark Zenier

    Mark Zenier Guest

    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.
    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 Washington State resident
  9. 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.

    -Commander Dave
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