Practical Oscillator Design

Chapter Practical Oscillator Design

Complete Electronics Self Teaching Guide with Projects
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Complete Electronics Self Teaching Guide with Projects

  • CHAPTER 9 OSCILLATORS422Because of the large variety of transformers and coils available, it is almost impossible to give you a simple procedure for designing an Armstrong oscillator. Instead, the manu-facturer specifies the number of turns required on the coils, which guarantees that the oscillator will work in its most common operation, at high radio frequencies.Because of the practical difficulties, the Armstrong oscillator and its variations are not explored any further.PRACTICAL OSCILLATOR DESIGN26  This section briefly covers some practical problems with oscillators.Before you proceed, review the important points of this chapter by answering the fol-lowing questions.QUESTIONSA. What three elements must an oscillator have present to work? B. What determines the frequency of an oscillator’s output signal?C. What provides the feedback?D. How many feedback methods for oscillators have been discussed?E. What do you need to start the oscillations once the circuit has been built?ANSWERSA. An amplifier, a resonant LC circuit (or some other frequency determining compo-nents), and feedback.B. The frequency of the output signal is the same as the resonance frequency.C. A voltage divider on the resonant circuit.Book Authorc09V107/04/2012 3:23 PM c09.indd 4227/4/2012 3:24:50 PM