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LED Torch - A white LED torch that consumes just24 mW (added 4/02) |
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LED Torch Circuits - (design added 04/08) |
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LED7 Solar Tracker - (electronic circuit added 7/03) |
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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 bulb timer - The circuit is rather small and could be housed in the same
case as the push button, if there is enough room. Of course you have to substitute the
standard switch with a push button. Operation with a 110Vac mains has not been tested
although I expect that a 100μF 100V capacitor instead of the 47μF capacitor should do
the trick....(circuit added 03/09) |
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Light Bulb Voltage Regulator - (circuit added 7/02) |
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Light Chaser - (electronic circuit added 7/03) |
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Light Control System - ….(circuit design added 08/08) |
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Light Controlled Switch - output a control signal suitable for relay depending on
the light level (added 4/02) |
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Light Dimmer Circuit with 0 to 10 Volt Input - This is a simple dimmer circuit
that can be controlled with0 -10 VDC. It is designed for110-Volt AC. (added 4/02) |
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Light Organ for Car - flashes3 low voltage lights, operates at10-25-Volt voltage,
in PDF format, text in Finnish (added 4/02) |
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Light switch - ….(design added 08/08) |
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Light/Dark Detector (Aaron Cake) - This handy little circuit can tell the
difference between darkness and light, making it very useful for switching on and off
signs, porch lights or other things when it gets dark or light. (electronic schematic
/ circuit added 04/03/02) |
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Lighting System - how to inexpensive, portable lighting system that add a great
deal of ambiance to the music performance, includes simple controller circuit (added
4/02) |
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Lightkeeper Automotive Lighting Control Module - Microchip Application Note
Published 27-Mar-02 (app note added 2/06) |
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Lights timer - Automatically turn off the lights after 10 minutes. If you often
forget to turn off the lights outside or at different places in the house, this
circuit can be practical for you. It can control two independent light switches with
different turn off times. Press the button once and the light turns on for the preset
time. Press again, and the light remains on forever. Press for the third time, and the
light turns off.....(design added 05/09) |
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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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Linear-brightness controller for LEDs has 64 taps - (Design Ideas - EDN,
03/15/2007) Digital potentiometer controls the brightness of LEDs. (electronic
design idea added 9/2008) |
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Loudspeaker Protection and Muting - Many hi-fi amplifiers and professional power
amps (and loudspeaker systems) provide some of protection, either to protect the
speakers from an amp fault, and/or vice versa. Some of these are implemented at a very
basic level - for example the use of a 'poly-switch'. The poly-switch is a non-linear
resistor, having ….(circuit design added 11/08) |
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Low cost / Automatic Emergency Light - ….(electronic schematic added 08/08) |
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Low Cost Converter Drives Fluorescent Tubes - 03/31/94 EDN-Design Ideas / (added
03/03/03) In the last few months, several designers have published circuits for
cold-cathode fluorescent-tube (CCFT) power supplies, and a specialized power-supply IC
is also now available. However, a significant number of CCFT applications don't
require.... |
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Low Cost Non-Dimming 220V Ballast Design / AN-42001 - Fairchild Application Notes
/ (app note added 6/06) |
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Low loss circuit Powers solar lantern - 04/01/04 EDN Design Ideas /
(added 1/05)The solar-lantern circuit in Figure 1 is a low-loss configuration that
uses a 7W, four-pin CFL (compact fluorescent lamp) and a 12V, 7-Ahr, sealed,
maintenance-free battery. The inverter features greater-than-85% efficiency,
less-than-2-mA quiescent current,.... |
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Low Power Crossing Light Flashers LM556 E+F - (circuit / schematic design added
6/06) |
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Low Voltage Light Dimmer - A light dimmer is a means of controlling the
"brightness" level of a lamp, in this application we will use a555 Timer to control
the brightness level of a low voltage incandescent bulb of up to 60-Watts. For the
light dimmer to work the555 Timer is configured as a "variable cycle", astable
oscillator running some where around300 Hz. (added 7/03) |
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Lx 800 Lighting System - Light is always needed for theatre and live music, and
this is just the ticket (electronic circuit added 7/03) |
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LX-800 Lighting system - (circuit design added 04/05/06) |
