Variable Voltage Regulator
1. INTRODUCTION
1. OVERVIEW
In order to achieve several small scale and large scale objectives in various electronic circuits, it is highly essential to regulate the voltage supply, given to electronic circuits. This project, namely VARIABLE VOLTAGE REGULATOR, aims at fulfilling such small goals, using the 3-terminal voltage regulator LM317.
The circuit consists of an IC LM317 and a set of resistors and capacitors, in addition to the transformer and the rectifying element.
The AC voltage, from the mains supply is initially stepped down to the desired voltage, which is then rectified to be applied to the input terminal of the voltage regulator IC. As mentioned earlier the voltage regulator then takes care of supplying a constant voltage at the output terminal. This voltage can be varied according to our requirements with the help of a variable resistor. This project designed has the ability to vary the voltage values from 1.5V to 25V at an output current of 1A.
2. APPLICATIONS
The LM317 is versatile in its applications, including uses in programmable output regulation and local on-card regulations
Typical other applications of the voltage regulator circuits include the following: • 5V Logic Regulator with Electronic Shutdown • Slow Turn-On 15V Regulator • High Stability 10V Regulator • 0 to 30V Regulator • Power Follower • High Gain Amplifier • 4A Switching Regulator with Overload Protection • Precision Current Limiter • Tracking Preregulator • AC Voltage Regulator • Digitally Selected Outputs
Besides replacing fixed regulators, the LM317 is useful in a wide variety of other applications. Since the regulator is “floating” and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., avoid short-circuiting
1. OVERVIEW
In order to achieve several small scale and large scale objectives in various electronic circuits, it is highly essential to regulate the voltage supply, given to electronic circuits. This project, namely VARIABLE VOLTAGE REGULATOR, aims at fulfilling such small goals, using the 3-terminal voltage regulator LM317.
The circuit consists of an IC LM317 and a set of resistors and capacitors, in addition to the transformer and the rectifying element.
The AC voltage, from the mains supply is initially stepped down to the desired voltage, which is then rectified to be applied to the input terminal of the voltage regulator IC. As mentioned earlier the voltage regulator then takes care of supplying a constant voltage at the output terminal. This voltage can be varied according to our requirements with the help of a variable resistor. This project designed has the ability to vary the voltage values from 1.5V to 25V at an output current of 1A.
2. APPLICATIONS
The LM317 is versatile in its applications, including uses in programmable output regulation and local on-card regulations
Typical other applications of the voltage regulator circuits include the following: • 5V Logic Regulator with Electronic Shutdown • Slow Turn-On 15V Regulator • High Stability 10V Regulator • 0 to 30V Regulator • Power Follower • High Gain Amplifier • 4A Switching Regulator with Overload Protection • Precision Current Limiter • Tracking Preregulator • AC Voltage Regulator • Digitally Selected Outputs
Besides replacing fixed regulators, the LM317 is useful in a wide variety of other applications. Since the regulator is “floating” and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., avoid short-circuiting