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.
simulate this circuit – Schematic created using CircuitLab
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?