LED decoder

[Scrubber]

Hello everybody, ive constructed a LED decoder, that will display number 0, 1 and 2, if binary inputs are 00, 01, 10. 

Ive installed some LEDs, but those suckers just keep blinking for a while and die out, could anybody point out what I did wrong here ?

The voltage is correctly present in all of my logic outputs.

[lcgse88]

Hello Scrubber,

How do you know that the logic of the circuit is fine, did you use the karnaugh map to do it? Can you share the circuit?

I look forward to hear from you.

Luis G

NI

[NeilCh]

Do you need series resistors to limit the LED current ?  May be the LEDs turning on, then going out as the gate output voltage reduces with overcurrent. 

Just a thought, hope it helps.

[Scrubber]

thank you for the answers, but it appears I failed this on my own, it seems to logic gates output only 5 V and the drop in each diode is 2V, had to get rid of one in series