LED working with SCB68

[Broken_Arrow]

The OP (Original Poster) said they are using a PCI 7830R. I guess I lost track of who was asking the questions.

[_Bryan]

Yes you are correct with the OP.  My fault....  I am using different hardware and did not mention that in my original post.  I will quietly back out of the thread now......

[alieas]

Hai i am the OP belongs to this little confusion... anyway actually i am trying some simple experiment by mapping PCI7830R with the SCB68 .... using Project Explorer Method in Labview.... for indication..i mean in experiments like.... Over threshold, Level Measurement, LED ON/OFF.. for this type of indication experiment i got correct output... but case like i want to show simply that SCB68 is mapped with 7830R card so i choose to make LED ON condition by using Digital Pin from SCB68...Voltage comming from SCB is 5v....eventhough when i placed my LED's in Bread Board is not getting ON....as i said earlier post... now with this i attached a Logic Gates experiment.... same prob as previous experiment i am facing here too...

[AnalogKid2DigitalMan]

Let's take a few steps back:

1. What is the manufacturer and part number of your LED?

2. Are you sure you have connected it with the proper polarity?

3. Attach a sketch of your circuit diagram.

4. Test the LED with an external power supply and appropriate series resistor to verify if works and measure the forward current through it if possible.

-AK2DM

[Ashu__]

Hi Alieas

As per your previous post:

"

so you r trying to say that, If  supply voltage VS = 9V, and have a red LED (VL = 2V), requiring a current I = 20mA = 0.020A, R = (9V - 2V) / 0.02A = 350, so choose 390 (the nearest standard value which is greater).

In my case (5-2) /0.8  =3.75ohm (Violet, orange, green)... so if i place this kind of resistor in each LED front.... the LED will on right?

"

Assuming that maximum current that your LED can take is 0.8A ( according to the specifications ).

You can try placing a resistor of value 3.75 ohms or higher in series with LED, and check if the LED lights up. 

In addition, please reply to the last post by 'AnalogKid2Digi..'.

Regards, 

Ashutosh Singh