Voltage Regulator 5V-20V Project

If you are looking for a low drop voltage regulator that is able to provide a power supply of 1A with an output voltage of between 5V and 20V DC, National Semiconductor LM2941 Low Dropout adjustable Regulator is one that you can choose to use.

It has a typical dropout voltage of 0.5V which means that the input supply need only have to be 0.5V DC more than the desired output voltage. Its other features include internal short circuit current limit and reverse battery protection.

As shown in the schematic below, the regulator has 5 pins which consists of the ON/OFF control, Input Voltage, Output Voltage, Ground and Adjustable pins. ON/OFF is used for the purpose of switching on and off of the regulator. The capacitors C1 and E1 are to be placed as close as possible to the regulator.

The output of the circuit can be varied by varying the value of potentiometer VR1 from 5V DC to 20V DC. The input voltage is limited from 5.5V DC to 30V DC. Resistor R1 must be greater than 1K. The value of the VR1 that needs to be set is calculated from the formula given below:

VR1 = R1[(Vout/1.275) - 1] ohm

If R1=1K, Vout = 5V, VR1 should be set to 2.9K ohm.

If R1=1K, Vout = 20V, VR1 should be set to 14.7K ohm 

Parts List

5V-20V Voltage Regulator Home Page 

ShareFacebookTwitterPinterestTumblrRedditWhatsAppMessenger

Recent Articles

• 
• 
• 

1. Electronics Events

   
   Join the electronics events to enhance your knowledge and network with other professionals in this industry.

   Read More

2. Electronics Design Contest

   
   Join electronics design contest and win prizes. Test your hardware and software skills against the best designers from the rest of the world.

   Read More

3. Electronics Project Design Schematics and circuit diagrams

   Electronics Project Design references and tips for high school students, teachers, colleges and university students, electronics hobbyist and electronics designers.

   Read More

Battery Tester Project

Design and build a battery tester to test dry cell and rechargeable battery with a voltage of less than 2V. Check here. 

PCB Prototypes

Make your own printed circuit board and learn the processes involved along the way. More here.

Heat Sink

Learn how to dissipate heat from your heat-sensitive electronic components.

Temp/Humidity Test

Test the reliability of your products to the environment by stressing them in test lab.

Digital Dice Project

Explore the use of 7-Segment Display, 555 Timer, Decade Counter and Binary Adder. Get the circuit.

Door Bell

Construct this simple door bell chime and have fun. Find out more here. 

Home Alarm Project

Build this simple home alarm to protect your house from intruders. See the schematic circuit.