Electronics - Parts & Accessories
1445 Main Street, North Vancouver B.C. V7J 1C9

Tel: 604-984-7322        mail@cordsplus.com
LED Flasher Kit, Bulk LED, with Housings, IR, 5mm Ultra-Violet Emitters, color LED



Light emitting diodes (LED's) are electronic components that produce light without heat or high voltages. When using LED's in
a DC circuit there are some basic rules you will need to follow.

LED's must be operated in such a way that the current through the LED is kept within the limitations of the device. The
simplest is to place a current limiting resistor in series with the LED. The resistor value can be calculated using Ohm's law.

Each LED type has specification called "forward voltage drop", they also have a specified current limit. Both these
specifications are required in order to calculate the size of the resistor required to limit the current.

The following is a general guideline for LED's without specifications.

Forward Voltage Drop:

Regular red 2.0v
High brightness red 2.2v
Super bright red 3.0v
Orange or yellow 2.0v
Regular green 2.0v
High Brightness green 2.2v
Super bright green 3.3v
Blue 3.4-4v
White 3.4-4v

Forward Current

20mA is a common standard value for most LED's.

Calculating the value of the current limiting resistor

Using a standard green LED with 2.0 Volt forward voltage drop and a forward current of 20mA and we want it to run in a
12 Volt DC circuit. ( 20mA = .02 Amps )

Using Ohm's law:

Subtract the forward voltage drop from the supply voltage.
12 Volts - 2 Volts = 10 Volts

Then:

10 Volts Divided By .02 Amps = 500 ohms

As resistors come in standard values, choose the next highest value, this will reduce the current slightly.

To calculate the wattage rating of the required resistor:

W=A x V    .02 x 10=.2 watts    Therefore use a 1/4 watt resistor.


Most Led's have a long lead and a short lead, the longer lead is the anode ( positive ) and the shorter lead is the
cathode ( negative ).


Connecting multiple LED's in series

Series LED's are connected cathode to anode to cathode to anode.. The limiting resistor is placed between the voltage source and one of the LED leads. In this type of circuit you need enough voltage to power the number of LED's you are using. 
To calculate the required resistor: Add the forward voltage drop for each LED together and subtract the total from the supply voltage.

For example if you have 4 LED's each with a 2 Volt voltage drop and a supply voltage of 12 Volts DC:

4 x 2.0V=8.0V    12V-8.0V=4.0V    4.0V will be the voltage at the resistor.

Then:

4.0V divided by .02A=200 Ohms  - use the next highest standard resistor value


For the resistor wattage: .02A x 4.0V=.80W ( 1/4 watt resistor ).

With a series LED circuit you can use any combination of LED colors with different voltage drops.

Multiple LED's in Parallel

LED's in parallel is not a good idea. The LED's will not have exactly the same voltage drop and because of these differences they will have different brightness levels and may be destroyed by the larger current flowing through it.

"Blinder" LED Flasher Kit
"Blinder" LED Flasher Kit

Kit features 3 crystal clear
special LEDs  which create
brilliant flashes of orange-red
light. The light output of
this flasher kit can be seen
 in direct sunlight.  Great for
 night joggers, bicyclists,
 warning markers, etc. Size
 of PC board: 2" x 1.4".
 Operates on one 9V battery
 (not included).
 Flash rate is adjustable with
 the built-in trimmer
 potentiometer. Complete with all parts, PC board and
 instructions. Skill Level 1.
 This kit requires soldering of
 components to the PC
 board while building.


#820  $10.77

Bulk LED

Bulk LEDs

We get them in by the box,
one big mess of prime new
 LEDs.  We then sort by
 color,
size and shape and
 sell them
 at a great price.

No specifications are
 available for LEDs


Apply 1 volt dc and step
 up till you get a glow from
 the lamp to find the
 forward voltage.



#521  $0.35 each
Bulk LED with Housings

Bulk LEDs with Housings

Same as the Bulk LEDs, but
theses have plastic housings
and may contain multiable
 LEDs
in the connector.

Stock keeps changing on
 theses
but the great low price
 stays the same.


#522  $0.75 each

ir LEDs

Bulk IR LEDs

Same deal as the Bulk
 LEDs and with a great price

#529  $0.56 each






5mm Yellow LED
Yellow LED

1000 - 1500 mcd rate LED
 5mm Yellow LED 
 Input voltage:1.9V-2.0V

#744  $0.62

5mm Red LED
Red LED

1000 - 1500 mcd rate LED
 5mm Red LED 
 Input voltage:1.9V-2.0V

#745  $0.62

5mm Green LED
Green LED

8000 + mcd rate LED 
 5mm Green LED
 (515~520nm wave)

Input voltage: 3.2V~3.4V
#743  $0.73

Blue LED Emitter

5mm Blue LED


1500-2000 MCD 5mm

 Blue LED Emitter

#144  $0.62
10.5mm LED Emitter
10.5mm LED Emitter
Focused light output
Resistor needed at 4.5 volts

#552  $1.25


5mm IR LED Emitters
5mm IR LED Emitters

IR illumination for night vision
 equipment and applications
 
 Input voltage:1.7V-2.2V

#145  $0.78
5mm White LED
14000 mcd rate LED bulb
 5mm White LED bulb 
14000 mcd LED

#719  $0.84



5mm Ultra-Violet Emitters
5mm Ultra-Violet Emitters

Ultra-Violet 
used in money watermark detectors, blood and stain detectors


#324  $0.78
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