Circuit Issue Help

[Dave Benemerito]

I've been finding what's the reason of this issue of my XOR Gate circuit for days but I couldn't find one. The issue is when I pull down both inputs low, the output is blinking which should not be.
I've been trying 3 different 74LS86 but still happens the same. Could you please help me out. Thanks

 

[(*steve*)]

Do you have a series resistor with that LED?

 

[Dave Benemerito]

Do you have a series resistor with that LED?

Thanks! I tried to put a 330Ω resistor from the cathode of the LED to GND. It did stop blinking, but when i tried to hook up the same output to another logic gate, specifically an OR Gate, the output of the OR gate lights up, which probably means it inputs a 1. What could be the problem there?

 

[(*steve*)]

It will work if you don't have the LED.

The load from the LED is too great for the output to maintain a valid output logic level.

 

[Dave Benemerito]

It will work if you don't have the LED.

The load from the LED is too great for the output to maintain a valid output logic level.

Wow thanks! It did really work! That saved me a lot of days haha. Sorry I'm just new to this. Am just learning with myself. Thanks!

 

[(*steve*)]

It's good to make the mistakes early on. You'll never forget then and you'll know what to look for.

 

[Dave Benemerito]

It's good to make the mistakes early on. You'll never forget then and you'll know what to look for.

Yeah.. Great! Thank you very much