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Adjustable Symmetrical Power Supply With LM317 and LM337

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Lm317 Lm337 symmetrical power supply PCB 3D board

The circuit will serve as a voltage converter with an input voltage of 35 V to produce an output voltage of 1.25 V to 30 V. The positive voltage is being handled by LM317 IC while the negative voltage is handled by LM337. The circuit can provide an output current of 1 A. During the production of 1 A current, the regulator is dissipating too much heat and without the presence of a heatsink, the regulator may get damaged.

The adjustable symmetrical power supply is suitable to be used in audio amplifiers, microphone amplifiers, op-amp applications, impedance converters and other devices that require regulated positive and negative DC supply, since the output current is 1.5 A.

Schematic  Symmetrical Power Supply Using negative and positive Regulator IC’s LM317 and LM337

lm337 lm317 regulated Symmetrical power supply circuit 700x508 Adjustable Symmetrical Power Supply With LM317 and LM337 pre amplifier Power Supply Circuits
Lm317 Lm337 symmetrical power supply schematic

Pcb for Symmetrical Power Supply Using negative and positive Regulator IC’s LM317 and LM337

337 317 Adjustable Symmetrical Power Supply pci 700x536 Adjustable Symmetrical Power Supply With LM317 and LM337 pre amplifier Power Supply Circuits
Lm317 Lm337 symmetrical power supply PCB
337 317 Symmetrical power supply layout 700x514 Adjustable Symmetrical Power Supply With LM317 and LM337 pre amplifier Power Supply Circuits
Lm317 Lm337 symmetrical power supply PCB layout
337 317 Symmetrical Power Supply silk 700x536 Adjustable Symmetrical Power Supply With LM317 and LM337 pre amplifier Power Supply Circuits
Lm317 Lm337 symmetrical power supply PCB silk

Part List for Symmetrical Power Supply Using negative and positive Regulator IC’s LM317 and LM337

Part Value
Resistors 1/4 Watt 5%
R1, R2 220 – Red, Red, Brown, Gold
Capacitors
C1,C2 4700µF/50 V – Electrolytic Capacitor
C3, C4, C7,C8 100nF/100V – Polyester or ceramic capacitor
C5,C6, C9,C10 10µF/50V – Electrolytic Capacitor
Semiconductors
D1, D2, D3, D4 1N4004 or equivalent – Diode Rectifier
IC1 LM317T – Positive Adjustable Voltage Regulator
IC2 LM337T – Adjustable Negative Voltage Regulator
Connectors
CN1 Connector for transformer
CN2 Connector regulated output voltage
Miscellaneous
P1, P2 4.7K – Trimpot horizontal assembly
Transformer 12 to 22 Volts with center tap and current according to the need to 1.5A max
Welding, Wire, box to accommodate circuit, printed circuit board, heat sink for ICs, etc..

Download the PDF for this assembly: Printed circuit board, schematic, component layout, component Silkscreen, LM317 Datasheet, LM337 Datasheet, AN-181 lm317 adjustable regulators.

Download PDF

Buy LM317 LM337 kits in Aliexpress

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