Archive for September, 2014

How to Change LED Clock Display Color

 

A clock with a light-emitting diode (LED) display comes from the factory with a light color defined by the LEDs. It is possible, however, to change the color of this display by changing the diodes. With a few tools and new LEDs, you can turn the display into any color you’d like.

Instructions
1
De-energize the clock by unplugging it or removing its batteries. Use a screwdriver to take out the screws on the back or the underside and slide the outer case up or back to expose the electronics.

2
Inspect the existing LEDs to make sure you can get to them by hand. If they are enclosed behind a plastic window or are otherwise inaccessible, you may have to unscrew subcomponents on the clock’s circuit board to get to them.

 

3.Re-energize the clock. Keep your hands and tools away from all exposed electronics and metal.

4
Use your multimeter to measure the voltage across each LED. Since an LED is powered by direct current voltage, use a DC voltage setting on your multimeter and apply its two leads across each LED. Each LED will have two electronic connections. Write down for each LED which connection is at the higher voltage potential as measured on the multimeter. Note that there are usually seven LEDs per each full clock character. So you will have to take about 25 measurements when you count the “1”, the three “0-9” characters, the “:” and indicators such as “AM/PM” or “low battery” lights.

5
Note if the LEDs are surface mount or radial (through-hole) construction. If they are flat and soldered to a circuit board, they are surface mount. If they have wires coming out of them that pass through the circuit board, they are radial.

6
Acquire LEDs of a new color made of equivalent construction. For example, if the existing LEDs are radial, buy new radial LEDs at an electronics store. You usually have to go to major outlets or shop online to get surface mount LEDs or to get a broader selection of colors.

7
When you have your new LEDs, de-energize the clock. Then use a soldering iron and copper braid to remove the solder to free the existing LED. Then solder the new LED in place. Note the marking on the new LED that indicates its electronic polarity so that you place its high voltage end at the connection you measured earlier as having the higher voltage. Re-energize the clock and see if the new LED works. If it’s dim or dark, you probably put it in backwards.

8
Once you’ve proved that you can replace one LED, de-energize the clock and replace them all.

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How to Wire 50 LEDs Together

LEDs, an acronym for light emitting diodes, are tiny lights often no bigger than a small button. They are most often found on electronic devices. They are often used to indicate that the power is on. LEDs have also become popular as holiday ornaments. People string together scores of multicolored LED lights together to light up Christmas trees and to add a decorative flare to furniture and rooms. Wiring LEDs together is not complex, and that’s because they only have two leads. However, you must perform a few calculations to determine the right power supply voltage level.
Instructions
Wire the LEDs

1
Determine the LED forward diode voltage. Look on the LED data specification sheet from the manufacturer. For this example, you might find “2.0 volts” listed on the data spec sheet.

2
Determine the voltage setting of the power supply. Multiply the number of LEDs by the diode forward voltage. For 50 LEDs and a turn-on voltage of 2.0 volts, the power supply voltage needed is 100 volts, because 50 multiplied by 2.0 equals 100.
Determine the amount of current needed. For a series connection of LEDs, the current needed is equal to the LEDs’ diode forward current specification. This specification is found on the data sheet. For this example, the forward current specification is 40 milliamperes, which translates to “0.04 amps” for your calculation.

4
Calculate the value of the current limiting resistor. Divide the voltage supply level calculated by the forward current specification to determine the value of the current limiting resistor. In this case, it is 2,500 ohms, since 100 volts divided by 0.04 is 2,500. Note the resistance value in ohms is equal to volts divided by current in amps.

5
Turn your power supply is off. Wire the LEDs in series with the power supply and resistor. An in-series connection means to connect several two-leaded components, such as the LED, so that each lead of one component is connected to another lead of another component.

6
Make the in-series connection of 50 LEDs with the power supply and a resistor. Connect the left lead of the resistor to the positive terminal of the battery. Connect the right lead of the resistor to the left lead (the anode) of the first LED. Next, connect the right lead (the cathode) of the first LED to the left lead (the anode) of the second LED. Continue to connect the LEDs in this fashion until you reach the 50th LED. Connect the right lead (the cathode) of the 50th LED to the negative terminal of the power supply. Your 50 LEDs are now connected in series with the power supply and the resistor.

Apply Power to Circuit
7
Review your power supply manual. Read its safety and operating instructions.

8
Set the power supply to its lowest voltage level (zero volts). For this example, also set the current supply limiting level to 40 milliamperes, the forward current specification of the diode.

9
Turn on the power supply. Slowly, turn up the power supply to 100 volts. Look at the LED string as you turn up your power supply’s voltage level. Stop increasing the voltage when you notice that the lights do not shine any brighter for an increase in voltage.

10
Turn off your power supply.
Tips & Warnings
Check the manufacturer’s LED data sheet for the marking that distinguishes the LED’s anode and the LED’s cathode. The cathode, also known as the positive LED lead, is usually the shorter of the two leads.

If your LEDs do not light, check to see if the anode and cathodes are connected correctly.

LED lead ratings and specifications are approximate. You may not need the actual voltage level calculated for the power supply. You may need a slightly higher or lower voltage for all your LEDs to light.

Study all and any electronic safety precautions. Improper electronic procedures can cause serious injuries. High electric currents can cause serious injury or death. Wear properly insulated shoes.

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How Does an LED Emit Light?

 

Light-emitting diodes, or LEDs, are used where a low-energy, long-lasting light is required. A LED will emit light that is not an adequate source of light for some applications, like indoor plant growing, as they lack the range of color in the light spectrum that is needed. The lower power needs of an LED make them a common choice for electronic indicator lights because their power draw will not interfere with the overall power supply.
Conductive Crystals
LEDs emit light due to the transmission of electrons from a high-energy (n-type) conductive crystal to a low-eneregy (p-type) crystals. When power is applied, the electrons in the high-energy crystal moved faster and cross over to the low-energy crystal. There the electrons assume the behavior of low-energy movement. When the n-type loses its energy and falls to a p-type level, light is emitted.

Diode
The diode used with an LED light consists of a positive and negative wire connected to the set of n- and p-type conductive crystals. The positive wire is connected to an energy source and the negative wire acts as the ground. The transmission process between the crystals that generate light occurs in the body of the diode between the two wires. A bulb may be attached to the body to amplify the light.
Connection
LED wires must be attached to the appropriate power and ground sources. Each wire is marked, typically on the body of the diode, with an indication of whether it is positive or negative. Alternately, the diode may have one arrow printed on it, with the direction of the arrow indicating the direction electricity should be flowing toward.

Lens
The lens attached to the diode body on an LED is what provides both color and amplification to the light produced. A visible LED produces a white light, although there are different types of LEDs that can produce other colors.

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How to Wire an LED Display

How to Wire an LED Display

LED’s (light-emitting diodes) were originally used as indicating lights – lights that would tell you when something was on or off. However, thanks to their brightness and limited power consumption, LED’s are increasingly being used as normal lighting, display lighting, and movie set lighting. You can create and wire your own LED display by extending a little time and using the proper material. The more intricate the display, the more difficult it will be to create and wire.
Instructions
1
Decide what you would like your display to be, then shape the cardboard or wood to fit the display. You will use the cardboard or wood to hold your LED lights in place.

2
Use a pencil to mark where you would like to put the LEDs. The marks you make should be slightly smaller than the diameter of the LED, because you won’t be putting the whole LED into the wood or cardboard.
3.Punch out the holes, or cut them out using scissors.

4
Put glue on the front of each hole and push the LED in from the front. When you push in from the front, the LED takes excess glue inside the hole with it, making your display look crisper. Repeat this with each LED, double checking to make sure the wire leads are available at the back. The wire leads are the long, metal pieces that stick out the back of the LED.

5
Connect the positive wire to the positive LED wire lead, and the negative wire to the negative LED wire lead. Ideally, you should do this by using a soldering iron, but simply stripping the wire and wrapping it around the wire lead may work.

6
Solder the positive wire to the positive end of the battery holder. Repeat this process for the negative end. Again, if you are unable to solder the wires, you can twist tie the wires around either end of the battery holder.

7
Insert batteries into the battery holder. This will turn on your LED display.

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How to Install an LED Rocker Switch

 

In many cases, auto accessories like driving lights or rear window defoggers, require a power source, so you will need to install a power switch to turn the accessory on and off. Many people prefer installing LED rocker switches for these applications, so when the accessory is turned on the switch lights up, which verifies the item is on.

Instructions
Installing Rocker Switch

1
First you will need to determine were the switch is to be mounted. It will need to be accessible, but not interfere with anything else.

2
Once you have located the area, you will need to drill a hole to mount the switch. The hole size will dependi on what size switch you have chosen. Switch panels are available that give you more options for mounting.

 

Mount the switch in the hole.

Wire the switch
4
Disconnect the battery.

5
Find the three terminals on the back of the switch. One is the ground. Another is the power in (it is recommend that you use an inline fuse for this wire).The third is the power out to the accessory.

6
Strip approximately 1/4 inch of insulation off each of the wires, using the wire strippers, that you will use to connect to the switch.

7
Crimp the terminals, using the wire crimpers, to each of the wires. Make sure that the terminal ends match the switch terminal. Normally the switch ends are male, so you will need the female ends for the wires.
With the ground wire you will need to locate a good ground, and attach the other end of the ground wire to the source. You can test the ground with a test light.

8
Connect the wires to the back of the switch–there will be a diagram on the switch that indicates were each of the wires go.The indicates the power input, the the ground, and (acc) the accessory.

9
Reconnect the battery and test the switch. The LED light should light up and the accessory should work.

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How to Make LEDs Brighter

 

Controlling the brightness of LEDs (light emitting diodes) lets you get more out of your LED design. If you’re a fashion designer, you can create more subtle effects in your LED studded clothes when you make colored LEDs brighter. For around the house, making your LEDs shine brighter will make it easier to read books and newspapers. It is not difficult to make an LED brighter, however trying to make your LED shine too bright or shine too bright for too long, could result in a shorter LED life or a LED that doesn’t light at all.
Instructions
Preliminary Calculations

1
Construct a table with two columns and four rows. Label one left column, “Current (mA)” for current in milliamperes. Label the right column “Brightness (mcd)” for luminous intensity in millicandelas.

2
Examine the current/brightness curve given in the manufacturer’s LED specification sheet. Mark four points on the curve with your pencil and label them “1” through “4.” Write the current level for the first point on the curve in the row one, column one of the table. Write the brightness level for the first point on the curve in row one, column 2 of the table. Continue in this fashion for the remaining three points you marked on the curve.
3.Subtract from the battery voltage (you are going to use to power your LED) the LED “forward voltage” from the manufacturer’s specification sheet. Label this result as “voltage drop across the brightness resistor or Vbr.” Divide Vbr by the highest current value in the table to determine the value of resistor you will need to make the LED the brightest. Label this result as “Resistor for highest brightness or Rb.”

4
Divide “Vbr” by the lowest current value in the table to obtain the resistor value for the lowest brightness level. Label the result as “Rlb” for “resistor value with lowest brightness level.”

5
Connect the positive terminal of the battery to the left lead of resistor Rbl. Connect the right lead of resistor Rbl to the positive terminal of the LED (anode). Connect the negative terminal of the LED (cathode) to the negative terminal of the battery. Observe the brightness level of the LED.

6
Replace resistor Rbl, the low brightness resistor, with Rb, the high brightness resistor. Observe that the brightness level is greater with Rb then with Rbl

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How to Stop Christmas Lights From Blinking

You have many different kinds of Christmas decorations to choose from when you are ready to decorate your house for the Christmas season. Among the many different decorations that you have to choose from are a wide variety of Christmas lights. You can use outdoor lights, rope lights, old-fashioned lights with big bulbs and then there are the typically indoor Christmas lights that most people use on their tree. From the typical Christmas lights you can choose between blinking and non-blinking lights. You can take a few easy steps to transform a strand of lights that blink into a non-blinking strand of lights.

Instructions
Traditional Christmas Lights

1
Examine each bulb on your Christmas light strand, starting at one end and working your way toward the other end. Look for clear bulbs that have a red or silver tip. These bulbs are blink bulbs that will transform a normal strand of Christmas lights into a blinking strand of Christmas lights.

2
Remove a blink bulb once you come to one and replace it with a normal bulb. For colored strands of lights you will replace the blink bulb with a solid-colored bulb. For strands of white lights you will replace the blink bulb with a clear bulb that doesn’t have a red or silver tip.

 

3.Plug the strand of lights in to see if they still blink. The area of lights surrounding the bulb you just removed shouldn’t blink, unless you missed a blink bulb. Continue inspecting the rest of the bulbs on the strand, starting where you left off, if part of the strand is still blinking.

4
Remove and replace any remaining blink bulbs until the strand no longer blinks.

Multi-Function Christmas Lights
5
Look for the dial on your strand of blinking Christmas lights. The dial is located near the plug end of the Christmas lights.

6
Plug the strand of lights in. Turn the dial one way, if the blinking on the strand of lights slows down then continue turning in that direction until the lights no longer blink. Turn the dial the other way until the lights no longer blink if the blinking of the lights speeds up with the first turn of the dial.

7
Switch to a different strand of lights if turning the dial all the way to the slow end of the dial doesn’t stop the lights from blinking. In this case the strand isn’t capable of being turned into a non-blinking strand.
Tips & Warnings
Make sure that your Christmas light strand is unplugged before you remove and replace any bulbs.

 

 

How to Make a LED Pen

 

Light emitting diodes (LEDs) are wonders of modern science, creating an impressive amount of light with a relatively small amount of electricity. LEDs can last for years without replacement, making them an increasing popular alternative to more temporary light sources. LED pens, featuring a bright LED in place of the ink tip, are useful due to their portability and small size, making them the darlings of electricians and automobile mechanics.
Instructions
1
Remove the cap from your flat highlighter pen.

2
Use a pair of needle-nose pliers to remove the end cap and ink rolls. There should be a larger ink roll inside the main pen body and another smaller roll extending from the pen tip.
3.Place your LED along the edge of your coin battery so that the terminals straddle either side of the battery. When pressed against the battery, the LED should light up. If it does not, rotate the battery 180 degrees.

4
Wrap a small piece of electrical tape around the LED terminals and coin battery.

5
Drop the glowing LED into the end of your highlighter pen. The LED will protrude from the tip of the pen, offering its bright glow in the direction of your choosing. The flat sides of the pen allow the wide coin battery to slide in.

6
Shake your highlighter. If the LED and battery bundle moves around inside your pen, shove a few sheets of tissue into the end to hold everything in place.

7
Place the end cap on your highlighter when your pen is not in use.

 

Tips & Warnings
Use a more powerful coin battery to make your LED grow even brighter.

Remove the end cap and separate the battery from the LED when you are not using your new pen.

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How do I Use a Potato to Create LED Light?

 

A potato can be used to make electricity.

Batteries supply power to our cars, flashlights and even our television remote controls. But organic matter such as fruits and vegetables can also be used as batteries. Tomatoes, lemons and potatoes all have the potential for acting as batteries. By creating a chemical reaction between organic matter and metals, electricity is created. Such a chemical reaction can be created within a potato to provide power for a light-emitting diode or LED light.

Instructions
1
Insert a penny and a galvanized nail into the potato and about 1 inch deep. The penny and nail will serve as electrodes. They should not touch one another. If they do, no electricity or voltage will be created. This is known as “shorting out” a battery.

2
Connect the copper wires to the penny and the nail. Connect one wire to the penny and connect the other wire to the nail by wrapping them. The wires should be stripped of all insulation.

3
Connect the open ends of the wire to the LED bulb. The light should now illuminate.
Tips & Warnings

You can use a voltmeter on a DC or direct current setting to test the amount of electricity emitted from the potato. Place the meter leads on the potato’s terminals or the penny and nail.

 

Insulated copper wires with alligator clips can be used to allow you to attach to the penny and nail with ease.

 

If the LED bulb does not illuminate, there may be insufficient electricity to power it. In this case, you can wire a second potato to provide additional electricity.

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How to Change LED Lights on Trailers

How to Change LED Lights on Trailers

Visibility is important when driving. LED lights will help with visibility at night because they are dramatically brighter than regular incandescent lights. LED lights also make your trailer safer. Changing LED lights on a trailer is a simple task that will not take too much time to complete

Instructions
1
Remove the encasing the LED light is in. Do this on both of the trailer lights.

2
Remove the burned-out LED light. Do this on both of the trailer lights.

 

 

 

Install the new LED light bulbs into the socket. Do this on both of the trailer lights.

4
Pump your brakes two or three times to see if the lights work. Make sure the LED lights are working and are the right color.

5
Replace the encasing that was removed. Do this on both trailer lights.

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