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Main => Builders Discussions => Topic started by: Themax on September 04, 2010, 02:06:02 AM
Hello,
I have the Engravity desktop kit and I want to interface my led's to my mastercard from oc. I'll use 2 led's from 1 output for each annunciator. Will this cause a problem ?
What do you think is the best solution to connect the led's the easiest way ? I saw some guys doing it directly to the cards or via pcb's. What is the easiest solution to connect the led's to my oc cards ?
Can I use any type of led ? Is there something I should have a look when buying led's ? Do I have to use resistors ?
Thank you,
Maxime.
Hi Maxime,
you can put two LED's directly to an OC output (with a resistor !!).
(https://www.cockpitbuilders.com/proxy.php?request=http%3A%2F%2Flh5.ggpht.com%2F_iLUlFS7yyXo%2FTIIv--h_CGI%2FAAAAAAAADNE%2FUjnCV005rPU%2FOC_LED1.jpg&hash=73c7516e850813d1568d7c2fa7bb08b175332a72)
The value of the resistor depends on the data of the LED's:
fall of voltage (Ud)
Current (I)
R1=(Usum - 2xUd)/I
Usum is the voltage of the OC-Output, it is 5V.
I hope this helps
Uwe