Monday, May 13, 2013

Dual Adjustable Power Supply

At present we can see lots of people have to face many troubles as a result of not having good smooth power supply then This is the circuit diagram of a dual adjustable power supply using IC’s LM 317 & LM 337.LM 317 is able to deliver a maximum of 1.5 A at a range of 1.2 V to +30V .LM 337 is the negative complement of LM317.They also have a built in short circuit protection.

Parts List

C1, C2 2200 uF 50V Electrolytic Capacitor
C3, C4, C5, C7 2.2 uF 50V Electrolytic Capacitor
C6, C8 100 uF 50V Electrolytic Capacitor
R1, R4 5K Potentiometer
R2, R3 220 Ohms 1/4 W Resistor
D1 to D4 IN 4007 Diodes
U1 LM317 U2 LM337 T1 24 0 24 Center Tapped 2 Ampere Transformer
S1 SPST 2 Ampere Switch
Extra Heat sinks for two IC’s , Power Cord, Casing, Wire etc

The transformer should be anything that produces a min of 3 A with (24 0 24 ) output voltage.

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