AI-3PARALLEL-RESONANT CIRCUIT—A resonant circuit in which the source voltage is connectedacross a parallel circuit (formed by a capacitor and an inductor) to furnish a high impedance to thefrequency at which the circuit is resonant. Often referred to as a tank circuit.PERIODIC WAVE—A waveform that undergoes a pattern of changes, returns to its original pattern,and then repeats the same pattern of changes. Examples are square waves, rectangular waves, andsawtooth waves.POSITIVE CLAMPER—The lower extremity of the output waveshape is clamped to a dc potential of 0volts.PULSE—Signal characterized by a rapid rise and decay from an initial level.PULSE OSCILLATOR—A sine-wave oscillator that is turned on and off at specific times. Also knownas a ringing oscillator.PULSE-REPETITION FREQUENCY (PRF)—The number of times in 1 second that a waveformrepeats itself.PULSE-REPETITION RATE (PRR)—Same as Pulse-Repetition Frequency (prf).Q—Figure of merit (efficiency) of a circuit or coil. Ratio of inductive reactance to resistance.QUIESCENT STATE—Time during which a tube or transistor of an electrical circuit is not performingits active function.RC CONSTANT—Time constant of a resistor-capacitor circuit. Equal in seconds to the resistance valuemultiplied by capacitance value.RC DIFFERENTIATOR—An RC circuit in which the output is taken from the resistor.RC INTEGRATOR—An RC circuit in which the output is taken from the capacitor.RC NETWORK—A circuit containing resistances and capacitances arranged in a particular manner toperform a specific function.RC OSCILLATOR—An oscillator in which the frequency is determined by resistive and capacitiveelements.REGENERATIVE FEEDBACK—The process by which a portion of the output power of an amplifyingdevice is fed back to reinforce the input.RESONANCE—The condition in a circuit containing inductance and capacitance in which the inductivereactance is equal and opposite to the capacitive reactance. This condition occurs at only onefrequency and the circuit in that condition is said to be in resonance. The resonant frequency can bechanged by varying the values of either the capacitance or inductance.RESONANT CIRCUIT—A circuit that contains both inductance and capacitance and is resonant at onefrequency (X_{L} = X_{C}).RESONANT FREQUENCY—That frequency in a given resonant circuit at which the inductive andcapacitive values are equal and cancel each other.RL DIFFERENTIATOR—An RL circuit in which the output is taken from the inductor.

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