A voltage regulator can be one of two things:
- A device that is fitted between a receiver and gyro or servo to drop the operating voltage from around 6V that BECs often produce to the 5V that many fast servos require to operate without damage. This is sometimes called a stepdown regulator;
- A device that drops the voltage from a battery down to 5V to 6V to run the flight electronics, allowing a nitro or gasser helicopter to run its electronics off of a 2S or 3S LiPo battery; essentially this is a battery eliminator circuit.
Both drop their input voltage down from a higher value to a lower one, but the latter is designed to cope with much larger voltage differences and much higher currents than the former, and therefore are much larger, heavier and more expensive.
A basic stepdown regulator can be made by soldering one or more diodes into the positive line of the servo lead; see link below.
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