I am building circuits using TTL gates and the outputs are observed on LEDs. But I get the output as only a small blinking of the LED for logic one. There is no malfunctioning with the power supply part as I used it as the supply for analog circuits. The regulated supply is taken from ac mains using 7805 IC. When the supply is given directly to the LED it blinks brightly indicating no problem with LED. I tried with different TTL Ics but the problem seems to be same.