Analog Electronics
Which of the following is not a sinusoidal oscillator?

 Relaxation oscillator
 LC oscillator
 RC phase shift oscillator
 Crystal oscillator

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Analog Electronics
Optocouplers combine

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

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