The Hartley Oscillator

Chapter The Hartley Oscillator

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

  • CHAPTER 9 OSCILLATORS414D. What is the condition that results in the highest possible resonance frequency? E. What would be the highest resonance frequency if C1 is fixed at 0.01 μF, and C2 can vary from 0.005 μF to 0.5 μF? ANSWERSA. The following table shows the values of CT and fr:C1C2CTfr0.01 μF0.1 μF0.009 μF4.19 kHz0.01 μF0.2 μF0.0095 μF4.08 kHz0.01 μF0.3 μF0.0097 μF4.04 kHz0.1 μF1 μF0.09 μF1.33 kHz0.2 μF1 μF0.167 μF0.97 kHzB. Increasing C2 decreases the resonance frequency, and, therefore, decreases the out-put frequency of the oscillator.C. Increasing C1 also decreases the resonance frequency and the output frequency of the oscillator.D. When CT is at its lowest possible value.E. When C2 is 0.005 μF, CT will be 0.0033 μF, which is its lowest possible value. Therefore, the frequency is at the highest possible value, or approximately 6.9 kHz. The lowest frequency occurs when C2 is at its highest setting of 0.5 μF.THE HARTLEY OSCILLATOR25  Figure 9.27 shows a Hartley oscillator circuit. In this type of circuit, the feedback is taken from a tap on the coil, or from a connection between two inductors.Book Authorc09V107/04/2012 3:23 PM c09.indd 4147/4/2012 3:24:30 PM