variable power supply with adjustable voltage and current

Parts

12v,2amp ac transformer

4amp bridge rectifier

4,700uF capacitor

10uF capacitor

100n capacitor

100n capacitor

IC L200

1k resister

10k potentiometer

47ohm potentiometer

Notes

Using the versatile L200 voltage regulator, this power supply has independent voltage and current limits. The mains transformer has a 12volt, 2 amp rated secondary, the primary winding should equal the electricity supply in your country, which is 220V here in the pak. The 10k control is adjusts voltage output from about 3 to 12 volts, and the 47 ohm control is the current limit. This is 10mA minimum and 2 amp maximum. Reaching the current limit will reduce the output voltage to zero.