Check the datasheet for your voltage regulator.

I am pretty sure that some capacitors are required, but I cannot see a single one on your breadboard picture.

If the 5V supply is not clean and stable, then anything can happen with digital ICs

 

Still not owrking, one switch is off, goes to the 13th pin, 13th pin is 4.95 V, one switch is on, goes to the 12th pin, 12th pin is 0V, 11th pin (output) is 0V. I used 4.7 kilo ohm resistors

Switch on/off is ambiguous and it's tedious to read your descriptions of how things are connected. Post a schematic.

 

Hello,

As said, place some decoupling capacitors on the regulator:



Also use some resistors from the output of the gates to the +5 Volts.
Any value between 1K and 4K7 will do:

The image is taken from the attached databook.

Bertus

 

I didn't notice that the output of a 74LS136 needs a pullup resistor.
Did you connect the 4.7k pullup resistor from pin 11 to pin 14?

You should read the datasheet of everything you try. Your voltage regulator is missing the extremely important input and output capacitors.

 

I have 100 uF (microF) electorlytic capacitors, are they good ?

EDIT : oh now i see that I should use 0.1 and 0.22 uF ones.. oh well

 

Okay so I got the capacitors, 0.22uF going from Vi to gnd, and 0.1 uF from Vo to gnd.

For whatever inputs output is always 0 V, except when both inputs are connected to +5V output is 0.12...

So both of my 74LS136N 's are probably broken right?

 

Hello,

Where is the pull-up resistor as @Audioguru and I told you about?
Without the pull-up resistor the output will always be low.

Bertus

 

Where is the 4.7kΩ pull-up resistor from pin-14 to pin-11?

 

Oooohhh.... So that resistor is what was the problem now it works thanks guys xD...

I also got 74HC86N today (also xor gate)
and it works fine without output pullip resistor.
And some 74LSxx I used and and or ones also didn't need output pull up resistor why does 74LS136N need one

 

Oooohhh.... So that resistor is what was the problem now it works thanks guys xD...

I also got 74HC86N today (also xor gate)
and it works fine without output pullip resistor.
And some 74LSxx I used and and or ones also didn't need output pull up resistor why does 74LS136N need one

Read the data sheet.
If it says OPEN COLLECTOR OUTPUT, then it needs a load resistor (pull-up resistor).

 

Oh well I really need to read them datasheets