adjustable regulated D.C. power supply

I have to make a regulated power supply in my project.
Ratings-8.5V
1A,using Bridge rectifier.

Posted by Gulshan Patel (gpatel258@gmail.com) on 04/08/2010, at 11:37 GMT

Adjustable Regulated PSU

There are 2 different methods of obtaining the voltage you require. 1 Use the LM317 variable voltage regulator ic. Data available from national.com or rapidonline.com. 2 Use a voltage boosted 7805 regulator by adding a PNP transistor to the regulators ground/com terminal. The emitter is connected to the regulators ground/com terminal. The collector goes to 0v/ground. The base terminal is fed from a resistor (potential) divider network between the regulators output and ground/0v which could be a potentiometer say 4k7 ohms.

Posted by Robert Neill (varient412@yahoo.co.uk) on 18/08/2010, at 20:12 GMT