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Audio Oscillators 401
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The Twin T Oscillator An audio oscillator circuit that is popular for general-purpose use is the twin T oscillator (Fig. 24-18). The frequency is determined by the values of the resistors R and capacitors C. The output is a nearperfect sine wave. The small amount of distortion helps to alleviate the irritation produced by an absolutely pure sinusoid. The circuit shown in this example uses two PNP bipolar transistors. They are biased for class A amplification. The Multivibrator Another popular AF oscillator circuit makes use of two identical common emitter or common source amplifier circuits, hooked up so that the signal goes around and around between them. This is sometimes called a multivibrator circuit, although that is technically a misnomer, the term being more appropriate to various digital signal-generating circuits. In the example of Fig. 24-19, two N-channel JFETs are connected to form a multivibrator for use at AF. Each stage amplifies the signal in class A, and reverses the phase by 180 . Therefore, the signal goes through a 360 phase shift each time it gets back to any particular point. A 360 phase shift is equivalent to no phase shift at all, so it results in positive feedback.
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24-18 A twin T audio oscillator using two PNP bipolar
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transistors. The frequency is determined by the values of the resistors R and the capacitors C.
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402 Amplifiers and Oscillators
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24-19 A multivibrator audio oscillator using two N-channel JFETs. The
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frequency is determined by the value of the inductor L and the capacitor C.
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The frequency of the circuit shown in Fig. 24-19 is set by means of an LC circuit. The coil uses a ferromagnetic core, because stability is not of great concern and because such a core is necessary to obtain the large inductance needed for resonance at AF. Toroidal cores or pot cores are excellent in this application. The value of L can range from about 10 mH to as much as 1 H. The capacitance is chosen according to the formula for resonant circuits, to obtain an audio tone at the frequency desired.
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IC Oscillators In recent years, solid-state technology has advanced to the point that whole circuits can be etched onto silicon chips. Such devices are called integrated circuits (ICs). The operational amplifier, also called an op amp, is a type of IC that is especially useful as an audio oscillator because it has high gain, and it can easily be connected to produce positive feedback.
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Refer to the text in this chapter if necessary. A good score is at least 18 correct. Answers are in the back of the book. 1. The decibel is a unit of (a) relative signal strength. (b) voltage.
Quiz
(c) power. (d) current. 2. An oscillator at RF requires the use of (a) a common drain or common collector circuit. (b) a stage with gain. (c) a tapped coil. (d) a quartz crystal. 3. Suppose a circuit is found to have a gain figure of 15 dB. Which of the following statements is true (a) The output signal is stronger than the input signal. (b) The input signal is stronger than the output signal. (c) The input signal is 15 times as strong as the output signal. (d) The output signal is 15 times as strong as the input signal. 4. In an oscillator circuit, the feedback should be (a) as great as possible. (b) kept to a minimum. (c) just enough to sustain oscillation. (d) done through a transformer whose wires can be switched easily. 5. A power gain of 44 dB is equivalent to which of the following output/input power ratios (a) 44:1 (b) 160:1 (c) 440:1 (d) 25,000:1 6. An RF choke (a) passes RF signals but blocks dc. (b) passes both RF signals and dc. (c) passes dc but blocks RF signals. (d) blocks both dc and RF signals. 7. The optimum capacitance values in an amplifier circuit depend on (a) the power-supply voltage. (b) the power-supply polarity. (c) the input signal strength. (d) the input signal frequency. 8. An oscillator might fail to start for any of the following reasons, except (a) low battery voltage. (b) low stage gain.
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