apata mokakhari wadak karaganna gitaama powerpack ekak oonawena awasthaawal godak thiyenawa.
eeth a power pack walin samahara welaawata wadi A agaya pramaanawath nowana awastha thibenawa.anna eekata wisadumak lesa mema valtage regulator paripathaya yodaagatha haka.

mema circuit eka hadaagathwita obata power pack awashya nowe. enam memagin puluwan 12v agaya 3v,6v,9v dakwaa adu kara ganna.
mehi D313 transistor  ekata heatsink ekak yodaagannan.

circuit diagram eka
mehi selector kiyana wayar eka sawiwana sthaanaya wenas karamin obata awashya valtage  eka labaagatha haka.
me sadahaa 1A 12v tranformer ekak yodaagannennam wadaath saarthaka we.

parts list eka
D313 - 1
120 ohm - 1
82 ohm - 1
68 0hm -1
33 ohm - 1