power supply..

[overmind]

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..

 

[FusionITR]

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]

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

 

[lord loh.]

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

 

[overmind]

thanks for all your replies..

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

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

 

[lord loh.]

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

Read the datasheet here.

 

[Sebi]

**broken link removed**