Current sensing components

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IR2172 ? current-sense-to-PWM -260-+260mV input. 

MAX4071 100V/V, bidirectional, with polarity output pin
        100v/v isn't quite enough, but with an ADC reference of 1v, 
        that would give full scale at 100A, or 100mA per bit. not
        great but the same as the Tri-Metric does, anyway. 

TI INA169 current/voltage output, unidirectional, can set gain pretty high