It's a usual clamp circuit, actually.They might be acting like clamp circuits, although it is a pretty weird connection.
Possibly yes, but it doesn't affect the principle circuit operation.for me is some illogic in these circuit; the one Op has a good voltage reference for the 2v threshold, the other a simple
attenuator and at these is missed a min. 100 nF bypassing too...
Yes. Any kind of DAC can be used as setpoint source. The ranges can be adapted.It means is no mystery.
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