Tutorial

7/27/2015 UnregulatedPowerSupplyTutorialSparkFunElectronics
https://www.sparkfun.com/tutorials/103 2/9
GutsoftheUnregulatedPowerSupply
Letsfirstlookattheinternalsofanunregulatedpowersupply.Now,Iamnotgoingtogooverthe
functionalityindetailofeachcomponent,thereareabunchofresourcesonthewebthatgooverhow
thesethingswork.Hereistheschematicandaquickrundownofcomponentsyoumightfind:
ThisistheschematicforthepowersupplyItookapart.Ontheleftiswhereyouplugtheunitintothewall
andontherightiswhereyouplugtheunitintoyoursystempowerinput.

Thewalloutlet'sACsignalwillfirstseeathermalcutoffICusedtoprotectthesupplyifthereisalarge
loadattachedthatdrawstoomuchcurrent.Thisisaniceaddedlevelofprotectionthatisnotfoundinall
wallwarts,justtheniceones.