Power Supply :
LM338K Adjustable Power Supply 1.2 - 30V 5A
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When working with electronics, you always need one basic thing; power. This power supply is great for powering all kinds of electronic projects. It produces a well filtered, variable 1.2-30 volts at 5 amps. It is easy to build and the parts are realitively easy to find.
Part
C1 1 14000uF or 10000uf 40 VDC Electrolytic Capacitor
C2 1 100uF 50Vdc Electrolytic Capacitor
C3 1 0.1uF Disc Capacitor
C4 1 0.01uF Disc Capacitor
R1 1 5K Pot
R2 1 240 Ohm 1/4 W Resistor
U1 1 LM338K 1.2 to 30 Volt 5 Amp Regulator
BR1 1 10 Amp 50 PIV Bridge Rectifier
T1 1 24 V 5 Amp Transformer
S1 1 SPST Toggle Switch
MISC 1 Wire, Line Cord, Case, Binding Posts (for output)
Part
C1 1 14000uF or 10000uf 40 VDC Electrolytic Capacitor
C2 1 100uF 50Vdc Electrolytic Capacitor
C3 1 0.1uF Disc Capacitor
C4 1 0.01uF Disc Capacitor
R1 1 5K Pot
R2 1 240 Ohm 1/4 W Resistor
U1 1 LM338K 1.2 to 30 Volt 5 Amp Regulator
BR1 1 10 Amp 50 PIV Bridge Rectifier
T1 1 24 V 5 Amp Transformer
S1 1 SPST Toggle Switch
MISC 1 Wire, Line Cord, Case, Binding Posts (for output)
Notes
- The regulator comes in a TO-3 case and MUST be used with a LARGE heatsink. You may want to mount a small fan to blow air across the regulator (I did).
- The filter capacitor is large. It won't fit on any board so bolt it to the case.
- You can, of course, add a volt and amp meter.
- Since this project operates from 120 VAC, you must include a fuse and build the project in a case.
Source : http://www.aaroncake.net/circuits/supply.asp