An application of the 555 timer sometimes called a voltage-to-frequency converter because the input voltage changes the output frequency is the
A) quartz crystal oscillator.
B) twin-T oscillator.
C) astable multivibrator.
D) voltage-controlled oscillator.

Question

Quizplus · Accepted Answer

The voltage-to-frequency converter is essentially a voltage-controlled oscillator, and the 555 timer can be configured as a voltage-controlled oscillator with the appropriate circuitry. Therefore, choice D, voltage-controlled oscillator, is the best choice for this application. The other options, quartz crystal oscillator, twin-T oscillator, and astable multivibrator, do not directly relate to the specific application of a voltage-to-frequency converter.

An Application of the 555 Timer Sometimes Called a Voltage-To-Frequency