Post by thread:[OT]: UV Erasers

Hello, I'm cosidering a design with one of the RF pics, since these are OTP, the development would have to be on a windowed part and I would need an eraser. Yeah I could just buy one..... And recomendations would be helpful. But I was thinking that the new UV LEDs might be suitable for the task, has anyone any experiance with this? It seems to me that a UV LED, a little box (sample box from maxim maybee...) a resistor and my bench power supply -- voila! Total cost les than $4 Thoughts? Denny -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

On Wed, 6 Aug 2003 17:09:58 -0400, you wrote: >Hello, >I'm cosidering a design with one of the RF pics, since these are OTP, the >development would have to be on a windowed part and I would need an eraser. > >Yeah I could just buy one..... And recomendations would be helpful. > >But I was thinking that the new UV LEDs might be suitable for the task, has >anyone any experiance with this? >It seems to me that a UV LED, a little box (sample box from maxim maybee...) >a resistor and my bench power supply -- voila! Total cost les than $4 > >Thoughts? Nope - UV LEDs have much too long a wavelength -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

----- Original Message ----- From: Mike Harrison <spam_OUTmikeTakeThisOuTWHITEWING.CO.UK> To: <.....PICLISTKILLspam@spam@MITVMA.MIT.EDU> Sent: Wednesday, August 06, 2003 5:22 PM Subject: Re: [OT]: UV Erasers On Wed, 6 Aug 2003 17:09:58 -0400, you wrote: >Hello, >I'm cosidering a design with one of the RF pics, since these are OTP, the >development would have to be on a windowed part and I would need an eraser. > >Yeah I could just buy one..... And recomendations would be helpful. > >But I was thinking that the new UV LEDs might be suitable for the task, has >anyone any experiance with this? >It seems to me that a UV LED, a little box (sample box from maxim maybee...) >a resistor and my bench power supply -- voila! Total cost less than $4 > >Thoughts? Nope - UV LEDs have much too long a wavelength What wavelength is actualy needed? At what intensity and time? Maybee someone could point me towards somthing that details this information. Thanks -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

On Wed, 6 Aug 2003 17:31:45 -0400, you wrote: {Quote hidden}>----- Original Message ----- >From: Mike Harrison <mikeKILLspamWHITEWING.CO.UK> >To: <.....PICLISTKILLspam.....MITVMA.MIT.EDU> >Sent: Wednesday, August 06, 2003 5:22 PM >Subject: Re: [OT]: UV Erasers > > >On Wed, 6 Aug 2003 17:09:58 -0400, you wrote: > >>Hello, >>I'm cosidering a design with one of the RF pics, since these are OTP, the >>development would have to be on a windowed part and I would need an eraser. >> >>Yeah I could just buy one..... And recomendations would be helpful. >> >>But I was thinking that the new UV LEDs might be suitable for the task, has >>anyone any experiance with this? >>It seems to me that a UV LED, a little box (sample box from maxim >maybee...) >>a resistor and my bench power supply -- voila! Total cost less than $4 >> >>Thoughts? >Nope - UV LEDs have much too long a wavelength > > >What wavelength is actualy needed? At what intensity and time? Maybee >someone could point me towards somthing that details this information. >Thanks The wavelength is 253.7nm Germicidal lamps are suitable (e.g. Philips TUV) -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Ok, scrap that idea. What's everyone / anyone recommend for an inexpensive eraser? ----- Original Message ----- From: Mike Harrison <EraseMEmikespam_OUTTakeThisOuTWHITEWING.CO.UK> To: <PICLISTspam_OUTMITVMA.MIT.EDU> Sent: Wednesday, August 06, 2003 7:13 PM Subject: Re: [OT]: UV Erasers On Wed, 6 Aug 2003 17:31:45 -0400, you wrote: {Quote hidden}>----- Original Message ----- >From: Mike Harrison <@spam@mikeKILLspamWHITEWING.CO.UK> >To: <KILLspamPICLISTKILLspamMITVMA.MIT.EDU> >Sent: Wednesday, August 06, 2003 5:22 PM >Subject: Re: [OT]: UV Erasers > > >On Wed, 6 Aug 2003 17:09:58 -0400, you wrote: > >>Hello, >>I'm cosidering a design with one of the RF pics, since these are OTP, the >>development would have to be on a windowed part and I would need an eraser. >> >>Yeah I could just buy one..... And recomendations would be helpful. >> >>But I was thinking that the new UV LEDs might be suitable for the task, has {Quote hidden}>>anyone any experiance with this? >>It seems to me that a UV LED, a little box (sample box from maxim >maybee...) >>a resistor and my bench power supply -- voila! Total cost less than $4 >> >>Thoughts? >Nope - UV LEDs have much too long a wavelength > > >What wavelength is actualy needed? At what intensity and time? Maybee >someone could point me towards somthing that details this information. >Thanks The wavelength is 253.7nm Germicidal lamps are suitable (e.g. Philips TUV) -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

> From: Denny Esterline [RemoveMEfirmwareTakeThisOuTTDS.NET] > > Ok, scrap that idea. > What's everyone / anyone recommend for an inexpensive eraser? > If you want cheap, Datarase II available at DigiKey $39.95. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

I've got one and can say it works well, appears to be durable (I can't say it is becuase I try to avoid abusing it, so I've never tested its durability) and you can't really beat the price. -Adam Eisermann, Phil [Ridg/CO] wrote: {Quote hidden}>>From: Denny Esterline [spamBeGonefirmwarespamBeGoneTDS.NET] >> >>Ok, scrap that idea. >>What's everyone / anyone recommend for an inexpensive eraser? >> >> >> > >If you want cheap, Datarase II available at DigiKey $39.95. > >-- >http://www.piclist.com hint: The list server can filter out subtopics >(like ads or off topics) for you. See http://www.piclist.com/#topics > > >. > > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

> Ok, scrap that idea. > What's everyone / anyone recommend for an inexpensive eraser? Buy an UV lamp and use the no-transformer-enhanced-plus-tabajara schematic from Roman Black to drive it ;o) Just don't forget to NEVER (hey boy, I said N E V E R) look at it when turned on. --- Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.507 / Virus Database: 304 - Release Date: 04/08/03 -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

If I understand the response correctly regarding the Roman Black eraser (I have not seen it personally), it sounds like it is not enclosed: I love the spirit of DIY, but I cringe when I hear things like this...just be careful...what if a youngster who does not know about the dangers of UV plays with this and damages his or her eyes? Buy a COTS UV eraser -- they have a safety mechanism (not fool-proof) to prevent exposure. Or, go the extra mile to enclose the unit and build a safety mechanism into it. Best regards, Ken Pergola {Original Message removed}

> If I understand the response correctly regarding the Roman Black eraser (I > have not seen it personally), it sounds like it is not enclosed: I was talking about the circuit, and not about the enclosure ;o) > I love the spirit of DIY, but I cringe when I hear things like this...just > be careful...what if a youngster who does not know about the dangers of UV > plays with this and damages his or her eyes? Remember I told him to N E V E R look at the light of the lamp, when it is turned on. It has the most beautiful blue bright light I've ever seen, but it DOES (I said DOES DOES DOES DOES DOES!!) lots of harm to your eyes --- Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.507 / Virus Database: 304 - Release Date: 05/08/03 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

> power, wavelength Try 253nm 25mW/cm^2, 20 minutes. Beware these are not mchip figures, they are for general EPROM erasing. It does not hurt to go to 100mW/cm^2. If you think this is too much, the power per unit area is equivalent to 1kW/m^2 which is the total irradiation of the sun at noon (give or take a little and not in UV but all wavelengths). This will likely not damage anything (but use at your own risk ;-). Peter -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email TakeThisOuTlistservEraseMEspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body