Aircraft Electronics Technician AET - NCATT

NCATT Aircraft Electronics Technician (AET) Study Guide
o Produces useful power at two or three times the frequency of the fundamental
pulse rate
o Stores energy alternately in the inductor and the capacitor. This storage method
produces an output that is sinusoidal
• Oscillator
o Electronic circuit that converts DC into AC at predetermined frequencies and
amplitudes
o Without the amplifier, electronic oscillation would be quickly dampened out by
the resistance in the wiring of the circuit
o The primary purpose is to generate a repetitive waveform at a constant (peak to
peak) amplitude and specific frequency and to maintain this waveform within
certain limits
• Regenerative Feedback Path
o Positive feedback
o A regenerative feedback path makes any amplifier an oscillator
Wave Shaping Circuits:
Individuals should be able to explain the use and operation of wave generation wave-shaping
circuits with reference to the following terms:
• Astable Multivibrator
o Two conditions of temporary stability and no permanent condition of stability
• Bistable Multivibrator
o Two transistors that alternate conducting. One transistor conducts until an
external pulse stops its conducting. Then, the other transistor takes over
conducting
• Crystal-controlled Oscillator
o See Wave Generation Circuits/Oscillators
• LC Tank
o See Wave Generation Circuits/Oscillators
• Monostable Multivator
o One permanent stable mode of operation
• Oscillator
o See Wave Generation Circuits/Oscillators
• Transistor
o Semiconductor devices that have three or more electrodes
o Transistors are used for switches and amplifiers
Copyright © 2012 by the National Center for Aerospace & Transportation Technologies. All rights reserved. Individuals may
download, print, and make copies of this document for their own personal use. Commercial use prohibited.
Page 25 of 60