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

A regulator circuit is specifically designed to maintain a constant voltage level even when there are variations in the input voltage or load conditions. Its main function is to ensure that the output voltage remains stable to power electronic devices safely and effectively. This makes it essential in circuits that require a precise voltage for optimal operation, preventing damage to electronic components from voltage spikes or drops.

In contrast, oscillators are circuits that generate waveforms of specific frequencies, and while they are important in radio technology for signal generation, they do not control voltage levels. Filters are used to remove unwanted frequencies or to smooth out signals, but they do not regulate voltage. Phase inverters are primarily used in amplifying circuits to reverse the phase of a signal, and they are not involved in controlling voltage levels from a power supply.