opencockpits usb output card prob?

[super2277]

If I may add to the clarification:

It is important to realise that a led is a light emitting diode. A diode has no resistance in one direction and infinite resistance in the other direction... If you would you put 5 V over a led in the direction in which has no resistance the current will become infinite and you will blow up the led instantly. That's why you need a so called current-resistor in series with the led (does not matter at which side) in order to get the current through the led at the optimum level; for a lot of leds that optimum level is 20 mA, but you can find that in the documentation of the led, same as the fixed voltage drop over the led.

Okay thanks for help so i need 33ohm for green LED

but if i take out the jump1 and connect 5.17v from my PSU, and connect it to the output card, will the USBoutput card send out 5.17v or 5v still? and on the output card the red goes on the right side and black on left? because i dont have the plug for connecting

[kiek]

Here is info about the jumper settings and the connector

Do note that the 64 outputs of the Opencockpits Outputs card share a common +5V, so the output pin is the GND pin. This is important for how to place your led...

[super2277]

Here is info about the jumper settings and the connector

Do note that the 64 outputs of the Opencockpits Outputs card share a common +5V, so the output pin is the GND pin. This is important for how to place your led...

Okay thanks! but i burned my card wire when i tested this before i used the resistor! but only the gold line from the 2 jumpers was burned! can i use 2 wire and soldiring it togheter and the card will work again?