Figure 2-29.Shunt-fed Hartley oscillator with buffer amplifier.
Q-22. What is the frequency that is twice the fundamental frequency?
Q-23. What is the purpose of the buffer amplifier?
This chapter has presented information on oscillators. The information that follows summarizes the
important points of this chapter.
WAVE GENERATORS can be classified according to the SINUSOIDAL or NONSINUSOIDAL
SINUSOIDAL WAVE GENERATORS (oscillators) produce a sine wave of constant amplitude
and frequency. There are three ways to control the frequency of sine-wave generators: (1) RC
NETWORKS, (2) LC NETWORKS, and (3) CRYSTALS.
NONSINUSOIDAL WAVE GENERATORS (oscillators) generate complex waveforms such as
SQUARE WAVES, RECTANGULAR WAVES, SAWTOOTH WAVES, TRAPEZOIDAL WAVES,
and TRIGGERS. Nonsinusoidal wave generators are often called RELAXATION OSCILLATORS.
A BASIC OSCILLATOR can be thought of as an amplifier that provides itself with a signal input.