Author - Robert H. Russell

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Robert H. Russell	Write for Electronic Design
Robert H. Russell is the vice president of engineering with Garmire Russell Associates, Washington, D.C. He has more than 30 years of experience in the field and holds a dual degree in electrical and mechanical engineering from the University of Sydney, Australia. Email address: r.heathcote.russell@dartmouth.edu
1 results found for Robert H. Russell, displaying items 1 - 1

October 9, 2008 [Ideas For Design]
Simple Threshold Switch For An LED Indicator
I needed a simple LED indicator showing that a particular voltage level had been reached—specifically, that a capacitor had charged to a particular potential. I was convinced that there must be a way that a programmable zener diode, such as the TL431, could be used but I found no simple circuits. My first thought was just to connect a series current limiting resistor and LED to the cathode so that the LED would light when the reference potential was reached...