Question T6D05
From subelement T6 - T6D
What type of circuit controls the amount of voltage from a power supply?
Why is this correct?
A regulator is correct because it's specifically designed to control and maintain a steady voltage output from a power supply. While filters smooth out voltage ripples and oscillators generate signals, only a regulator actively monitors and adjusts the output voltage to keep it constant despite variations in input voltage or load current. This voltage control function is the regulator's primary purpose.
Memory tip
Look for the word "controls" in power supply questions - it's your key indicator. Regulators actively control, while filters passively smooth. When you see "controls the amount of voltage," think regulation, not filtration or generation.
Learn more
Voltage regulators are essential in amateur radio equipment because they ensure consistent performance regardless of battery discharge or varying AC line voltage. Without regulation, your transceiver's power output and frequency stability would drift as supply voltage changes. Linear regulators maintain precise voltage through continuous adjustment, while switching regulators achieve the same goal with higher efficiency. Both types actively monitor the output voltage and make real-time corrections to maintain the specified voltage level.
Think about it
Why do you think amateur radio equipment requires such precise voltage regulation when many household devices seem to work fine with simple power supplies?