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

  • Rajkumar Sharma
  • 458
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  • moderate
  • Tested

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
Note1: Power supply supports 230V AC input and 115V AC input. Jumpers are located under PCB for input voltage selection, remove input power cable while changing Jumper selection.
Note 2: This power supply contains hazardous voltage at the input side, PCB must be installed in an encloser that prevents accidental contact. Use plastic screws to mount this power supply PCB.

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

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 ([email protected], [email protected])
  • 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

NO.QNTY.REF.DESC.MANUFACTURERSUPPLIERSUPPLIER PART NO
11BR1BRIDGE GBL08 OR GBL06VISHAYDIGIKEYGBL06-E3/45GI-ND
21CN13 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1248-ND
31CN23 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5316-ND
41CN34 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5317-ND
51CN43 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1248-ND
62C1,C50.1uF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
72C2,C41000uF/25VRUBYCONDIGIKEY1189-2960-ND
82C3,C610uF/25V SMD SIZE 1206MURATA/YAGEODIGIKEY
91D1RED LED SMD SIZE 0805LITE ONDIGIKEY160-1427-1-ND
101D2GREEN LED SMD SIZE 0805DIALIGHTDIGIKEY350-2044-1-ND
113J1,J2,J3SOLDER JUMPER 0-OHMS RESSISTOR SIZE 1206MURATA/YAGEODIGIKEY
122R1,R2470E 5% SMD SIZE 0805MURATA/YAGEODIGIKEY
131T1TAMURA 3FD-312TAMURADIGIKEYMT2102-ND
141U1LM7805 TO220TIDIGIKEY296-44520-1-ND
151U2LM7905 TO220TIDIGIKEYLM7905CTNS/NOPB-ND

Connections



Gerber View

Photos










Video

LM7805 Datasheet

LM7805

PCB

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