Abstract
This chapter discusses different types of signal generators. Signal sources are generally used to produce signals which are applied to circuits; to test those circuits' performances in the design, manufacture and service stages of their lives. It follows that the signal source used to test any particular circuit must be of the right type: for instance, an audio amplifier could not be tested with a radio frequency signal — rather obvious, but it needs stating. Signal sources are generally categorized into two areas: audio frequency and radio frequency sources. But there are many more applications for signal sources than just audio and radio frequency circuit testing. Servo systems require a signal source varying between just fractions of a hertz to just a few hertz — well below audio frequencies. A signal source's output signal is not usually taken directly from the oscillator or amplitude modulator. The two most common oscillator circuits used in signal generators are the Hartley oscillator and the Colpitts oscillator.
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