Exam 21: Oscillators Key

The Wien-bridge oscillator is the standard oscillator for frequencies in the range of 5 Hz to about 1 MHz.

When using an FET oscillator,the loading effect on the tank circuit is much less than with a bipolar transistor.

The output stage of a 555 timer can source ________.

The monostable 555 timer circuit produces a single pulse whose width is determined by

The oscillation frequency of an astable multivibrator is determined by

An Armstrong oscillator uses transformer coupling for the feedback signal and can be recognized by a small secondary winding sometimes called a tickler coil.

In a phase-shift oscillator,the lead circuits produce a 180° shift and the amplifier provides the additional 180° necessary for oscillation.

A typical voltage-controlled oscillator can be varied over a

The Colpitts oscillator is recognized by the capacitive voltage divider used to produce feedback necessary for oscillations.

A standard oscillator circuit used for low to moderate frequencies in the range of 5 Hz to 1 MHz and the one almost always used in commercial audio generators is the ________.

The frequency where the output of a lead-lag circuit is maximum is called the resonant frequency.

An Armstrong oscillator can be recognized by its

A Hartley oscillator uses a tapped resistor to provide the feedback signal.

A circuit that produces an output voltage proportional to the phase difference between two input signals is called the

A phase-locked loop can be used as

Charging a capacitor through a resistor produces

RC oscillators can be used to produce almost perfect sine waves at frequencies

A phase-shift oscillator will oscillate if three lead circuits produce a total phase shift of ________.

LC oscillators can be used to produce almost perfect sine waves at frequencies

Higher resonant frequencies which are almost exact multiples of a fundamental frequency are called ________.