A linear power supply is a type of power supply that converts alternating current (AC) to direct current (DC) using a transformer and linear regulation. It operates by stepping down the voltage through the transformer and then using a linear regulator to maintain a stable output voltage. This design is known for its simplicity and reliability. One of the main advantages of a linear power supply is its low output noise, making it suitable for sensitive electronic devices. However, it is less efficient than other types, such as switching power supplies, especially at higher power levels, as it dissipates excess voltage as heat.