Path: utzoo!attcan!uunet!lll-winken!ames!nrl-cmf!mailrus!tut.cis.ohio-state.edu!accelerator.eng.ohio-state.edu!phao.eng.ohio-state.edu!abali
From: abali@phao.eng.ohio-state.edu (Bulent Abali)
Newsgroups: sci.electronics
Subject: Re: Bright LEDs, visible infrared? Colored Chips?
Keywords: Colour, Chips, Larry Lippman, Cats
Message-ID: <1386@accelerator.eng.ohio-state.edu>
Date: 10 Jan 89 17:01:18 GMT
References: <743@optilink.UUCP> <888@ubu.warwick.UUCP> <1590@kodak.UUCP> <435@brambo.UUCP>
Sender: news@accelerator.eng.ohio-state.edu
Reply-To: abali@phao.eng.ohio-state.edu (Bulent Abali)
Organization: Ohio State Univ, College of Engineering
Lines: 16


>>Light does affect many chips creating surface charge carriers.  I have even
>>seen circuits where the leakage current caused by light in glass encased small
>>signal diodes (1N914, 1N4148) caused erratic behavior.  I even saw a RAM chip

Back in the old times when phototransistors were expensive, 
I would saw off the top of the metal case of a regular 
transistor with a file, and that would give me a pretty good
phototransistor.


-=-
Bulent Abali
Ohio State Univ., Dept.of Electrical Eng.
2015 Neil Av. Columbus, Ohio 43210
abali@baloo.eng.ohio-state.edu