Analog Electronics
An amplifier using an opamp with slew rate SR=1v/µsec has a gain of 40db.if this amplifier has to faithfully amplify sinusoidal signals from dc to 20 KHz without introducing any slew-rate induced distortion, then the input signal level must not exceed

79.5 mV
795mV
395mV
39.5mV

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Analog Electronics
Optocouplers combine

  Infrared light emitting diode and a silicon photo transistor.
 SITs and BJTs.
 IGBTs and MOSFETs.
 Power transistor and silicon transistor.

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