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BUILDING A 12 VOLT POWER SUPPLY
Components:
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120 v MOV
T1 18 volt @ 2 amp. transformer (Radio Shack # 273-1515)
BR1 Bridge rectifier, 4 Amp. @ 50 PIV (Radio Shack # 276-1146)
C1 4700 ?F @ 35 v. electrolytic capacitor (Radio Shack # 272-1022)
C2 1000 ?F @ 25 v. electrolytic capacitor (Radio Shack # 272-1019)
C3 .1 ?F @ 25 v. disc ceramic capacitor (Radio Shack # 272-135)
7812 voltage regulator (Radio Shack # 276-1660 assortment)
120 volt, 1 amp. fuse
3-wire line cord
sw DPST toggle switch
Jacks and connectors
Perf board or project board
Enclosure
?????????????
? ? 7812 12-volt VOLTAGE REGULATOR
???? ? ????
???? ????
? ?
?????????????
? ?
? 7812 ? front view
? ?
? ? Pin 1 = input
??????????? Pin 3 = ground
?? ?? ?? Pin 2 = output
?? ?? ??
?? ?? ??
?? ?? ??
?? ?? ??
1 3 2
?????????????????????
? FULL WAVE ?
? Bridge Rectifier ? BR1
? ?
?+ AC -?
?????????????????????
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
12-volt Power Supply schematic
sw fuse T1
AC __/???????? ac + 1????????2
? )??(??????????????????????? 7812 ??????????????????????+12v out
grn ??????? )??( ? bridge ? ? ???????? ? ?
---? ? mov ? )??( ?rectifier? ???+ 3? ???+ ???+
? ??????? )??( ? ? ??? C1 ? ??? C2 ??? C3
? )??( ? BR1 ? ? ? ? ?
AC __/????????)??(????????????- ? ? ? ?
sw ac ???????????????????????????????????????
? ? gnd