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From: bobc%wings@Sun.COM (Bob Clark)
Newsgroups: rec.ham-radio,sci.electronics
Subject: Re: build-it-yourself EPROM erasers
Message-ID: <41487@sun.uucp>
Date: 10 Feb 88 02:59:39 GMT
References: <8802091255.AA23298@ucbvax.Berkeley.EDU> <12@ucsd.EDU>
Sender: news@sun.uucp
Reply-To: bobc@sun.UUCP (Bob Clark)
Organization: Sun Microsystems, Mountain View
Lines: 25

In article <12@ucsd.EDU> brian@ucsd.edu (Brian Kantor) writes:
>Easy to do.  Go to a LARGE industrial electrical, restaurant,
>laundry, or hospital/sickroom supply house and buy an ultraviolet
>GERMICIDAL LAMP.  This will be a small clear fluorescent-style lamp 
>tube.  They are typically available in either 15 or 25 watt sizes.
>

All good stuff, especially the interlock.  UV is dangerous - please
exercise a great deal of caution.

A few details:
	Most EPROMs have a sensititity to a specific wavelength,
	e.g. 253.7 nanometers for the TI TMS2732A.

	Erase time is a function of total exposure dose, which is
	the product of the intensity * time.  To quote from TI
	(I just grabbed the TMS2732A spec at random):

	"The recommended minimum exposure dose (UV intensity x exposure
	time) is fifteen watt-seconds per square centimeter."

The exposure time will vary from device type to device type.

Bob Clark
Sun Microsystems