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The attached circuit should work. Be sure and use a heatsink for the IRFZ40 mosfet. The LT1054 doubles the input voltage to give enough voltage on the gate of the mosfet. The input/output differential can be as low as about 0.5 volts. The resistors on pins 5 and 6 of the LM723 are
2.0 k, but 2.2 or 3.3 k should work fine also