Electronics problem: Thermocouple reading on RAMPS 1.4

[jimc]

sure get a thermistor and either mount it in the block if there is a hole for it. if not and even a more accurate way is to take 1/4" kapton and tape it to the side of the nozzle. wrap the kapton tight. i use marlin and it has a PID auto tune feature. if your firmware has that then run it.

[Osama Kamal]

that's not what I meant, I meant that RAMPS 1.4 doesn't read from a thermocouple !! ... but I searched for it and found that it needs an extra module "thermocouple amplifier".
the most famous are AD595 op-amp circuit and MAX xxx something !!
I will build my own amplifier and connect it between my thermocouple and RAMPS 1.4
I found solutions there:
solution
reference RepRap Wiki