Analog Electronics
Darlington connection is achieved in 2 transistors by connecting

 both base.
 grounding both collector.
 both collector.
 both emitter.

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Analog Electronics
In an OP-amp differentiator

Polarity of input and output is the same
Output occurs when input is finite and constant
The amplitude of output is proportional to input
The amplitude of output is proportional to rate of change of input

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