Dual +5 V/-5V @ 200 mA Regulated Linear Power Supply

The project presented here is a dual AC to DC output linear power supply. This power supply provides low ripple low noise DC regulated output. Usually, transformer-based linear power supplies are considered very bulky and inefficient, but this power supply still is very important for sensitive applications such as analog circuits, communications devices, radio devices, audio circuits, OPAMP-based projects etc.

Parts Explanation

• CN1 is AC input
• Jumper J2 for 230V AC input
• Jumper J1/J3 for 115V AC
• Transformer T1-Step down transformer provides 6.3V-0V-6.3V AC Outputs
• Bridge Rectifier BR1 converts AC into DC
• Capacitor C2/C4 DC filter capacitors
• CN2 unregulated DC output approx. +/-9V DC
• U1 +5V regulator
• U2 -5V regulator
• D1 +5 power LED
• D2 -5V power LED
• R1/R2 current limiting resistors for LEDs
• C1/C3/C5/C6 output DC capacitors
• CN3 Male header +/-5V regulated output
• CN4 screw terminal +/-5V regulated output

Input Voltage Selection

• For 230V AC Input: Close Jumper J2 and Jumper J1, and Open J3
• For 115V AC Input: Close Jumper J1 and J3, Open Jumper J2

Other Similar AC to DC Power Supplies

• Dual +12V/-12V @ 400mA Regulated Linear Power Supply with AC input
• Dual Output Adjustable Linear Power Supply +/-1.2V to +/-12V @ 250mA

Features

• Input 230V or 115V AC Input (Use Jumpers to Select 230V or 115V AC)
• Output +/-5V DC (Dual Output)
• Output Ripple Approx. 5mV
• Maximum Load Current 400mA (+5V@200mA, -5V@200mA)
• 2 x Power LEDs, for 5V and -5V
• Screw Terminal for AC Input
• Screw Terminal for Regulated DC Output
• 3 Pin Male Header Provides Unregulated DC Output
• 4 Pin Male Header for Regulated DC Output
• PCB Dimensions 88.42  x 36.67 mm

Schematic

Parts List

Connections

Gerber View

Photos

Video

LM7805 Datasheet

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