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From
LU9DCE
@21:5/101 to
BBSRT
on Mon Jul 1 18:40:04 2019
BUILDING A 12 VOLT POWER SUPPLY
Components:
----------
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 µF @ 35 v. electrolytic capacitor (Radio Shack # 272-1022)
C2 1000 µF @ 25 v. electrolytic capacitor (Radio Shack # 272-1019)
C3 .1 µF @ 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
--- Mystic BBS v1.12 A43 (Linux/32)
* Origin: HAMRADIO telnet lu9dce.dynu.com (21:5/101)
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