Re: Pete Lefferts LED current source
- From: Tim Wescott <tim@xxxxxxxxxxxxxxxx>
- Date: Tue, 21 Oct 2008 10:19:51 -0700
Walt Jung wrote:
I am trying to establish who and when first used an LED (RED or GRN) as a voltage reference to bias the base of a bipolar xstr as a current source/sink. To my best knowledge, this was Pete Lefferts of NSC, back in 1975.
1. Peter A. Lefferts, “LED Used as Voltage Reference Provides Self-Compensating Temp Coefficient,” Electronic Design, Feb. 15, 1975, pp. 92.
Comments welcome.
Walt Jung
That may be the first _published_ use, but I thought up the notion of using an LED to bias a transistor (not for a current source, but still...) on my own. I'm sure that others have, too, and very possibly before 1975 (but certainly not before the invention of the LED!!!).
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