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LED (Light Emitting Diodes) Circuits   Page 8b
LED:   #     A      B      C       D - E       F - H      I - K     L      M - O      P- R      S      T     U - V     W -Z

Last Updated on:
Tuesday, April 01, 2014 04:33 AM

Circuits Designed by Dave Johnson, P.E. :
  • Lighthouse LED Flasher
    This was originally designed for a model in a HO train set.  It simulates the behavior of the light from a lighthouse.  The LED intensity gradually increases, then flashes with a bright light and finally decreases slowly in intensity. 

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

LED driver delivers constant luminosity -  12-Jun-03 Issue of EDN  The circuit in Figure 1 is similar in principle to that of a previous Design Idea (Reference 1] but offers improved,reproducible performance. The output current is almost constant over an input-voltage range of 1.2 to 1.5V.... [Design Idea by Israel Schleicher, Bakersfield, CA]
LED driver displays standing-wave ratio -  03/18/99 EDN-Design Ideas.....The circuit in Figure 1 uses an LM3914 LED driver to directly display  standing-wave….PDF contains multiple circuits, scroll to find this circuit..... [Design Idea by Richard Panosh,Vista, Bolingbrook, IL]
LED driver doubles as fault monitor -  5-Aug-04 Issue of EDN  LEDs find wide use as indicators and as light emitters... [Design Idea by Anthony Smith, Scitech, Biddenham, Berdfordshire, England]
LED driver provides oscillator for microcontroller -  16-Sep-04 Issue of EDN  The major building blocks for a white-LED driver are an oscillator, a charge pump, and a regulated current source. National Semiconductor (www.national.com ].... [Design Idea by Wallace Ly, National Semiconductor, Santa Clara, CA]
LED driver provides software controlled intensity -  30-Sep-04 Issue of EDN  Recent advances in operating efficiency have expanded the use of LEDs from one of mere indicators to becoming driving forces in electronic lighting. Increased reliability and ruggedness (versus other lighting technologies] gives the LED a bright future indeed. Vendors in recent years have introduced many ICs for driving LEDs, but the problem of driving serial chains of LEDs has received less at..... [Design Idea by Neda Shahi and Bjorn Starmark, Maxim Integrated Products, Sunnyvale, CA]
LED driver provides software-controlled intensity -  09/30/04 EDN-Design Ideas.....Recent advances in operating efficiency have expanded the use of LEDs from one of mere indicators to becoming driving forces in electronic lighting. Increased reliability and  suggedness.....Page includes several designs.  Scroll to find this one..... [Design Idea by Neda Shahi and Bjorn Starmark, Maxim Integrated Products, Sunnyvale, CA]
LED drivers minimize power dissipation -  1-Feb-07 Issue of EDN  Reference source and pullup resistor improve efficiency..... [Design Idea by Fons Janssen, Maxim Integrated Products Inc, Bilthoven, Netherlands; Edited by Brad Thompson and Fran Granville]
LED flasher -  Schematic only, no circuit description
LED flasher -  Schematic only, no circuit description
LED Flasher -  I made LED flash circuit which is often used as the PIC software making practice.  This circuit controls the blink of eight LEDs with the software of PIC. The blinking pattern can be changed with five switches. ….....
LED Flasher -  Flasher uses LM3909 IC…. [Tony van Roon's circuit]
LED Flasher -  In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply. The transformer should have a primary rating of 240/220 volts for europe, or 120 volts for North America. The centre tapped secondary coil should be rated about 18 volts at 1 amp or higher,allowing for losses in the regulator. An application for this type of circuit would be for a small regulated bench power supply..... [Evin Devore]
LED Flasher -  Based on the Maxim MAX660, designed to power three 3mm/5mm white LED's from 3V (1.5V min) , intended for replacing incandescent bulbs in small torches….) [Submitted by Andre]

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