1.2 ~ 24V @1A, Regulated DC
Power Supply Using LM317
This simple low cost
DC power supply circuit provide very stable DC voltage (adjustable) from
1.2V to 24V. The use of LM317T regulator IC simplifies the circuit by reducing
the number of required external components. The total parts count is less than
10
The maximum output current is 1A
You may use it to power your electronic projects that require stable DC
supply.
FEATURES:
OUTPUT
VOLTAGE RANGE: 1.2 TO 24V
0.1% LINE
AND LOAD REGULATION
Equation for calculation of output voltage:
Vout =1.25 x
( 1+ VR1/(R3+R4) )
where R3
=470Ω, R4= 56Ω & VR1 adjustable from 0 ~ 10KΩ
Eg.:
VR1=0Ω when it's fully counter clockwise,
Output voltage =
1.25x(1+0/(470+56) = 1.25V
VR1=10K Ω when it's fully
clockwise,
Output voltage =
1.25x(1+10,000/(470+56) = 1.25x(1+19) = 25V
PARTS LIST:
IC1: LM317T 3-terminal
adjustable linear voltage regulator IC
LED1 3mm or 5mm LED
(Any Colour)
D1, D2 1N540x (X=2,..., 8) rectifier diodes ( if possible purchase 1N5402)
Resistor: (1/4W
or 1/6W)
R3 470Ω
R4 56Ω
R5 3.3K
Potentiometer: (B) 10K (linear taper) (output voltage adjustment)
Capacitors:
C1 either 2200
uF, 63V (min 35 V)
C2 100 uF
25V (min) Electrolytic capacitor
Miscellaneous items:
2 contact screw
terminal block x 1 pc.
3 contact screw
terminal block x 1 pc.
TO220 Heat
Sink (for IC1) x 1 pc.
Single Layer
PCB (min size 13 x 7 cm )
Power
transformer required: (HT24E15) Primary: ~230V, Secondary: 24V024V @1A
Voltage Display – 1
SCHEMATIC DIAGRAM:
PCB LAYOUT:
KEEP TRACK
STYLE = T70 MINIMUM
3D VIEW OF PROJECT:
Prof. D D Zala
09574219380
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