LED (Light
Emitting Diodes) Circuits Page 8b
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Last Updated on:
Wednesday, November 29, 2017 05:40 AM |
Circuits
Designed by Dave Johnson, P.E. : |
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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.
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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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] |
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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. ….....
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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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