I require some assistances in this simple circuit. I purchased the following RBG LEDs:
Emitted Colour : RED/GREEN/BLUE
Size (mm) : 5mm T1 3/4
Forward Voltage (V) : RED~2.1, GREEN~3.3, BLUE~3.3
Brightness: RED~5000mcd, GREEB~6000mcd, BLUE~5500mcd
Life Rating : 100,000 Hours
Viewing Angle : ±40°
Wavelenght: RED~630, GREEN~525, BLUE~470
http://www.ledshoppe.com/Product/led/LE1011.htm
I have an industiral 24VDC Omron power supply. The LED's common anode is connected to a 2.2K resistor and then the resistor is connected postive terminal of power supply. Each of cathode node is connected to a SPDT relay. Of course, the relay is then connected to negative terminal of power supply.
By my calculation, a resistor of 690-730 ohm should be sufficient. However, my LEDs lasts no more than 5 minutes at best. That is why I gone up to 2.2K ohm, however, this did not help in solving this problem. I have destoryed more than 10 LEDs already. What am I doing wrong? Is it possible the relay switching is killing my LEDs? Does it make any difference if I use 3 resistors at cathode side compared to my 1 resistor at anode side? Thanks in advance.
Emitted Colour : RED/GREEN/BLUE
Size (mm) : 5mm T1 3/4
Forward Voltage (V) : RED~2.1, GREEN~3.3, BLUE~3.3
Brightness: RED~5000mcd, GREEB~6000mcd, BLUE~5500mcd
Life Rating : 100,000 Hours
Viewing Angle : ±40°
Wavelenght: RED~630, GREEN~525, BLUE~470
http://www.ledshoppe.com/Product/led/LE1011.htm
I have an industiral 24VDC Omron power supply. The LED's common anode is connected to a 2.2K resistor and then the resistor is connected postive terminal of power supply. Each of cathode node is connected to a SPDT relay. Of course, the relay is then connected to negative terminal of power supply.
By my calculation, a resistor of 690-730 ohm should be sufficient. However, my LEDs lasts no more than 5 minutes at best. That is why I gone up to 2.2K ohm, however, this did not help in solving this problem. I have destoryed more than 10 LEDs already. What am I doing wrong? Is it possible the relay switching is killing my LEDs? Does it make any difference if I use 3 resistors at cathode side compared to my 1 resistor at anode side? Thanks in advance.