Post by thread:Erasing EPROM

I am looking for the cheapest way of erasing a couple of 27C512 eproms. Would positioning the chips under a ordinary party black light for a couple hours work? I have access to an ordinary bulb and a blacklight florescent fixture. What would be better to use if it would work? Stephen Inkpen spam_OUTsinkpenTakeThisOuTroadrunner.nf.net

Hi Steve, > I am looking for the cheapest way of erasing a couple of 27C512 eproms. Would > positioning the chips under a ordinary party black light for a couple hours > work? I have access to an ordinary bulb and a blacklight florescent fixture. > What would be better to use if it would work? No, a "blacklight" tube has no useful ultraviolet output, just lots of deep purple. But if you go buy a replacement "Gemicidal" tube it will work very well... (germicidal tubes have a completely clear glass). Just be careful not to look at it or you will get the worst case of "welders flash" or worse. You should build a box to enclose it which prevents the power being connected till the lid is completely closed. Remember, these things are DANGEROUS. regards ............ Zim

Stephen either will work, even exposing the chips to sunlight. It all depence on the time of exposition. Proceed as follow: Expose the chips a certain amount of time, say 1/2 hour. Then check the chips for beeing ereased. Repeat until all chips are ereased and count the cycles. Then add another number of cylcles, say 20% to get more safety. Regards Peter Keller Stephen Inkpen schrieb: > I am looking for the cheapest way of erasing a couple of 27C512 eproms. Would > positioning the chips under a ordinary party black light for a couple hours > work? I have access to an ordinary bulb and a blacklight florescent fixture. > What would be better to use if it would work? > > Stephen Inkpen > .....sinkpenKILLspam@spam@roadrunner.nf.net

Sunlight is cheapest - may take days depending on chip and where you are. INSERT CHIPS IN CONDUCTING FOAM !!! IC's in nice warm dry location like this will be extra ESD sensitive. We at one time long ago often erased ICs on a window ledge in sunlight. Many died until we placed an earthed metal plate under them. After that none died ! :-) Russell McMahon _____________________________ >From other worlds - http://www.easttimor.com http://www.sudan.com What can one man* do? Help the hungry at no cost to yourself! at http://www.thehungersite.com/ (* - or woman, child or internet enabled intelligent entity :-)) {Original Message removed}

On Mon, Jan 03, 2000 at 08:03:43PM +1100, Graeme Zimmer wrote: > But if you go buy a replacement "Gemicidal" tube it will work very well... > (germicidal tubes have a completely clear glass). > You have a supplier for these gems? I haven't been very successfull in finding them. TIA -- -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Peter L. Berghold PeterKILLspamBerghold.Net "Linux renders ships http://www.berghold.net NT renders ships useless...."

On Mon, 3 Jan 2000, Peter L. Berghold wrote: > On Mon, Jan 03, 2000 at 08:03:43PM +1100, Graeme Zimmer wrote: > > But if you go buy a replacement "Gemicidal" tube it will work very well... > > (germicidal tubes have a completely clear glass). > > > > You have a supplier for these gems? I haven't been very successfull in > finding them. Visit a contact lens shop. They use the bulbs in their client 'lenses sterilizers'.

> > > I am looking for the cheapest way of erasing a couple of 27C512 eproms. When we still lived in the Netherlands we had a sunlamp-bed to keep a bit of a tan in winter.. I (mis) used the thing to erase eproms. Especially the face part used essentially the same sort of tubes as were used in exposure beds for foto-pcb exposure. It took just a little bit longer than a UV-eraser. May be you can take a few chips "to bed" with you and keep a tan as well. Henk - VK2GWK http://www.users.bigpond.com/tobbe/

Last new ones I got were through Philips' lighting division, a couple of 7W, quite cheap, sure you could find those the world over. Jinx : {Quote hidden}> > But if you go buy a replacement "Gemicidal" tube > > You have a supplier for these gems ? > > TIA > -- > -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ > Peter L. Berghold .....PeterKILLspam.....Berghold.Net > "Linux renders ships http://www.berghold.net > NT renders ships useless...."