1. The problem statement, all variables and given/known data Hi, I am working on a temperature control system which involves using a power resistor to heat a block of aluminium and a thermocouple to measure the temperature. Both the thermocouple and the power resistor will be controlled using the NI USB-6008 and Labview. As my knowledge of electronics is limited, I am having trouble in designing a circuit to drive the power resistor. The resistance of the power resistor is 10Ω and I have a 12V power supply. 12/10=1.2A, so 1.2A is needed to get max power output, correct? The current o/p of the USB-6008 is 200mA so I believe I will have to amplify the current to achieve this. I have a 2N3055 power transistor to use and also some operational amplifiers. If anyone can point me in the right direction in identifying what the best way to achieve a regulated output voltage across the power resistor in the range of 0-12V, I would be very grateful. 2. Relevant equations 3. The attempt at a solution I am thinking of having the NI USB 6008 output input to V+ of a non-inverting amplifier, using the non inv. amp to get the required voltage gain (5V amplified to 12V) and then using the op-amp output as the input to the base of a pnp-emmiter follower circuit to get the required current gain.