The requirement is an automatic dump load controller; for balancing lead acid or lifo batteries. While the input voltage is above 1.75V the circuit should dump 10A into the load continuously.
So in theory (I think). R1, R2, Q1 and Z1 form a variable zener trigger; switching on Q2 while the input voltage is above that set by R2. Z2 should then sense the voltage across the load resistor; keeping current at 10 amps, by pulling Q2 low.
The problem is that I need to balance the batteries down to 1.75V, and the smallest zener I can find is 2.4 Volts.
Any other problems I'm not seeing?