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LED (Light Emitting Diodes) Circuits Page 8b
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Last Updated on:
Friday, August 29, 2008 02:34 PM
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| 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.
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| Links to electronic schematics,
circuits, designs and/or diagrams for engineers, hobbyists, students & inventors: |
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LED Traffic Lights: (electronic circuit added 4/05) |
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LED7 Solar Tracker: (electronic circuit added 7/03) |
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LED-Based Message Display: (electronic Circuit / Schematic added 10/04) |
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LEDs Flasher Alternately: Classic astable multivibrator
using2 transistors. Transistor is not critical. Try these:2N4401,2N2222, NTE123A, NTE123AP, NTE159, TUP/TUN and those in your junk box, you may
find that most of them will work. (added 4/02) |
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LEDs or Lamps Sequencer: Very simple, versatile modular
design No limits to the number of modules used in the ring (added 9/04) |
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Light a White LED from Half a Cell: 06/12/03 EDN Design Ideas
/ (added 1/05) Whether you use them as indicators or to provide illumination, LEDs are hard to beat in efficiency, reliability, and
cost. White LEDs are rapidly gaining popularity as sources of illumination, as in LCD backlights, but with forward voltages typically ranging from
3 to 5V, operating them from a single cell presents obvious difficulties.... |
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Light Flasher(Blinking Lights): This is a very basic circuit for flashing one
or more LEDS and also to alternately flash one or more LEDs.
It uses a 555 timer setup as an astable multivibrator with a variable frequency.
With the preset at its max. the flashing rate of the LED is about 1/2 a second. It can be increased by increasing the value of the capacitor from
10uF to a higher value. For example if it is increased to 22uF the flashing rate becomes 1 second. (added 10/05) |
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Light Pollution Meter : LED brightness control circuit and a
millimeter to compare light levels to LED level. (added 4/02) |
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Lighting Management System for Six White LEDs and One RGB or Flash LEDs:
National Semiconductor Application Note LP3936 June 2004 (app note added 02/05) |
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Lighting Management System for Six White LEDs and Two RGB or Flash LEDs:
National Semiconductor Application Note LP3933 March 2004 (app note added 02/05) |
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Line Powered White LEDs: (electronic circuit added 1/06) |
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Linear Constant Current LED Lamp Dimmer: This circuits drives24 white light
LEDs with an adjustable constant current. (added 4/02) |
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Line-powered driver lights up high-power LEDs: 6/8/06
EDN Design Ideas / (added 11/06) LED array reduces power and maintenance expenses. |
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LM27961-Dual-Display White LED Driver with 3/2x Switched Capacitor Boost:
National Semiconductor Application Note (app note added 2/06) |
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LM3485 LED Demo Board: National Semiconductor Application Note
(app note added 2/06) |
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LM3570: National Semiconductor Application Note (app note added
2/06) |
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LM3909 LED Flasher: (electronic circuit added 4/05) |
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Logic Probe uses Bicolor Led: 03/13/98 EDN-Design Ideas /
(added 03/03) |
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Low Power LED Flasher : based on LM3909 (added 4/02) |
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Low Power LED Volt Meter: (circuit / schematic design added
6/06) |
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Luxeon LED Heat Sinking Requirements:
Luxeon Application Note (app note added 2/06) |
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LX1995 LED Driver: Camera Flash Application (AN-30): Application Note 30 from
Microsem (app note added 6/06) |
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