I do not require a voltage proportional to the temperature, I only need to increase the TC voltage enough to be able to bias a transistor or FET to drive an led.You are not measuring temperature, you would be setting threshold(s).
Of course, there are designs using discrete components for a TC amplifier. If you want to deal with the noise problems, that's your choice. Using something professionally engineered and tested for that purpose is simplier, more likely to give success, and probably much cheaper considering the time it will take.
Let me ask what is the difference between making your own amplifier that gives a voltage proportional to the temperature and buying one that does that too? If you don't want the voltage to be proportional to the temperature, just toss the TC and use a resistor from your power supply.
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by Jake Hertz