XML RSS
What is this?
Add to My Yahoo!
Add to My MSN
Add to Google

Home
Electronics Blog
Electronic Hobbies
Wireless Projects
Surveillance Projects
Amplifier Projects
Automotive Projects
Timer Projects
Motor Control Projects
Telephone Projects
MCU Projects
Thermostat Projects
Final Year Projects
Power Supplies
PCB
Lighting Projects
Ham Radio Project
Electronic Parts
Parts Suppliers
Test/Measurement
Memory Devices
Electronic Tools
Download Software
Environment Tests
PCB Coating
CE Mark
EMC Standards
EMC Testing
Soldering Tips
ROHS Directive
FMEA
Free Magazines
Free Newsletter
Contact Us
SiteSearch
Links
Design Contest

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









Google
Web www.electronics-project-design.com





5V-20V Voltage Regulator Home Page




footer for voltage regulator page