- #1
garyd
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Homework Statement
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.
Homework Equations
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.
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