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Honored Contributor

15 years ago

user LED circuit on EP3C120F780 development kit

Hi, I checked the schematics of user LED ciruity on EP3C120F780 development board, the ciruit seems weird to me. The LED anode is connected to 3.3 through 56 ohm resistor and the cathode...

Altera_Forum

Honored Contributor

15 years ago

a LED does not have a voltage drop of 0.7V.

Depending on the color, you have a voltage drop of about 1.9 to 3.5V.

see https://secure.wikimedia.org/wikipedia/en/wiki/light-emitting_diode

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user LED circuit on EP3C120F780 development kit

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