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LED and Light Circuit

Index 8

DRIVING MANY LEDS Circuit

Published:2013/3/4 21:47:00 Author:Ecco | Keyword: DRIVING MANY LEDS

DRIVING MANY LEDS Circuit
The 555 is capable of sinking and sourcing up to 200mA, but it gets very hot when doing this on a 12v supply. The following circuit shows the maximum number of white LEDs that can be realistically driven from a 555 and we have limited the total current to about 130mA as each LED is designed to pass about 17mA to 22mA maximum. A white LED drops a characteristic 3.2v to 3.6v and this means only 3 LEDs can be placed in series. (View)

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DRIVING A BI-COLOUR LED Circuit

Published:2013/3/4 21:43:00 Author:Ecco | Keyword: DRIVING A BI-COLOUR LED

DRIVING A BI-COLOUR LED Circuit
Some 3-leaded LEDs produce red and green. This circuit alternatelyflashes a red/green bi-coloured LED: (View)

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BI-POLAR LED DRIVER Circuit

Published:2013/3/4 21:30:00 Author:Ecco | Keyword: BI-POLAR LED DRIVER

BI-POLAR LED DRIVER Circuit
Some 2-leaded LEDs produce red and green. These are called Bi-polar LEDs. This circuit alternatelyflashes a red/green bi-polar LED: (View)

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3x3x3 LED Cube Circuit

Published:2013/3/4 21:21:00 Author:Ecco | Keyword: 3x3x3, LED Cube

3x3x3 LED Cube Circuit
This circuit drives a 3x3x3 cube consisting of 27 white LEDs. The 4020 IC is a 14 stage binary counter and we have used 9 outputs. Each output drives 3 white LEDs in series and we have omitted a dropper resistor as the chip can only deliver a maximum of 15mA per output. The 4020 produces 512 different patterns before the sequence repeats and you have to build the project to see the effects it produces on the 3D cube. (View)

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LED- serial LED digital tube static display circuit (common anode )

Published:2013/3/1 2:43:00 Author:Ecco | Keyword: LED, serial , LED digital tube, static display, common anode

LED- serial LED digital tube static display circuit (common anode ) is shown as figure. (View)

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LED - serial LED digital tube static display circuit ( common cathode )

Published:2013/3/1 2:42:00 Author:Ecco | Keyword: LED , serial, LED digital tube , static display , common cathode

LED - serial LED digital tube static display circuit ( common cathode ) is shown as figure. (View)

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Basic LM3909 Led Flasher

Published:2013/2/27 20:26:00 Author:muriel | Keyword: Basic, LM3909, Led Flasher

Basic LM3909 Led Flasher
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Automatic Emergency Light

Published:2013/2/24 21:17:00 Author:muriel | Keyword: Automatic Emergency Light

Automatic Emergency Light
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Main Fuse-Panel Emergency Light

Published:2013/2/24 21:16:00 Author:muriel | Keyword: Main , Fuse-Panel, Emergency Light

Main Fuse-Panel Emergency Light
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Incandescent Lamp Flasher

Published:2013/2/24 21:00:00 Author:muriel | Keyword: Incandescent Lamp Flasher

Incandescent Lamp Flasher using two IRF511 HexFets which are configured as a simple astable multivibrator to alternately switch the two lamps, La1 and La2, on and off. The R & C values given set the flash rate to about 1/3 Hz. By varying either the resistor or capacitor values almost any flash rate can be obtainded. Increase either C1 and C2, or R1 and R2, and the flash rate slows. Decrease them and the rate increases.Unlike most semiconductor devices, the power MosFet can be paralleled, without special current-sharing components, to control larger load currents. That can be an important feature when the device is used to turn on incandescent lamps, because the lamp's cold resistance is much lower than the normal operating resistance.A typical #1815 12 to 14-volt lamp measures 6 ohms cold. When 12 volts is applied, the initial current drawn is 2 amps. The same lamp, when operating at 12 volts, requires only about 200mA. The hot resistance figures out to be ten times its cold resistance, or 60 ohms. That tidbit should be considered when picking any semiconductor device to control an incandescent lamp. (View)

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Laser diode driver circuit with double broadband transconductance operational amplifier OPA2662

Published:2013/2/20 1:00:00 Author:Ecco | Keyword: Laser diode driver , double broadband, transconductance , operational amplifier

Laser diode driver circuit with double broadband transconductance operational amplifier OPA2662
The circuit has a pair of laser -emitting diodes and laser receiver diodes, constituting the reflection laser transmitter and receiver circuits, the figure mainly shows a laser emitting driving circuit. (View)

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main fuse-panel emergency lights

Published:2013/2/19 20:12:00 Author:muriel | Keyword: main fuse-panel, emergency lights

main fuse-panel emergency lights
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Emergency Lights 2

Published:2013/2/19 20:10:00 Author:muriel | Keyword: Emergency Lights

Emergency Lights 2
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Emergency Lights 1

Published:2013/2/19 20:10:00 Author:muriel | Keyword: Emergency Lights

Emergency Lights 1
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Low cost / Automatic Emergency Light

Published:2013/2/19 20:09:00 Author:muriel | Keyword: Low cost, Automatic , Emergency Light

Low cost / Automatic Emergency Light
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Backup Lamp

Published:2013/2/19 20:05:00 Author:muriel | Keyword: Backup Lamp

Backup Lamp
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Light control energy-saving lamp (1) circuit

Published:2013/2/17 20:42:00 Author:Ecco | Keyword: Light control, energy-saving lamp

Light control energy-saving lamp (1) circuit
The working principle of the circuit is shown as figure, it is composed of the photoelectric conversion part, NAND gate, differential circuit and control circuit. When there is light, the photosensitive diode VD1 gets conduction, the potential of point A reaches the NAND gate YF1 door level, the output terminal of point b shows low potential, YF2 outputs the high potential, C1 and R5 form a differential circuit which outputs positive spikes at the point C, so BG1 gets conduction, J1 is instantaneously pulled ( then release ). Normally closed contact J1-1 is disconnected, CJ1 loses power and releases, the self-protection contact CJ1-1 disconnects, then the light is off. (View)