Analog Electronics
Darlington connection is achieved in 2 transistors by connecting

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

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Analog Electronics
The common-source JFET amplifier has

  no voltage gain.
  a very high input impedance and a relatively low voltage
  a high input impedance and a very high voltage gain.
  a high input impedance and a voltage gain less than 1.

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