power supply..

O

overmind

New Member

• Jul 18, 2006

• #1

hi pips.. im planning to create a power supply that has a 220v ac input and a selection of (5,10,12 volts dc) output.. i want to incorporate it with a switch selector so that i could just choose what output i want .. either 5v,10v or 12v. i dont want to use a potentiometer cause it takes time to get a specific voltage.. e.g. 5v. can anyone give me schematic diagrams.. please help.. thanks..

 

F

FusionITR

Member

• Jul 18, 2006

• #2

Just use a 60hz (maybe 50hz where you live?) transformer, diode bridge, and 3 linear regulators.

Then you can use a mechanical switch to switch between the outputs.

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Jul 18, 2006

• #3

Or an LM317 and switch three different value resistors in circuit.

 

lord loh.

Member

• Jul 18, 2006

• #4

The circuit is given in the Application Notes sections of the LM 317 Datasheet.

 

O

overmind

New Member

• Jul 20, 2006

• #5

thanks for all your replies..

lord loh. said:

The circuit is given in the Application Notes sections of the LM 317 Datasheet.

Click to expand...

can you be so kind to show me the link to this circuit? thanks..

 

lord loh.

Member

• Jul 20, 2006

• #6

https://pdf1.alldatasheet.com/datasheet-pdf/view/22749/STMICROELECTRONICS/LM317.html

Read the datasheet here.

 

Sebi

Active Member

• Jul 20, 2006

• #7

**broken link removed**