What type of circuit controls the amount of voltage from a power supply?

A regulator (or voltage regulator) is a specific type of circuit designed to maintain a constant output voltage, regardless of changes in the AC input voltage or the amount of current being drawn by the connected radio equipment. It ensures that sensitive electronics receive a steady, safe power level. Without a regulator, the voltage from a power supply might fluctuate dangerously depending on how much load the transmitter places on it, potentially damaging the equipment or causing poor signal quality. The distractors serve entirely different circuit functions: an oscillator creates an alternating current signal, a filter removes unwanted AC frequencies or ripple, and a phase inverter reverses the phase of a signal.