What is the name of a circuit that generates a signal at a specific frequency?
Reactance modulator
Phase modulator
Low-pass filter
Oscillator✓الإجابة الصحيحة
الشرح
An oscillator is by definition a circuit that sustains its own output at a frequency set by a resonant element such as a crystal or an LC tank, with no input signal required. The modulator choices change an existing signal rather than generating one.