12 Vdc Dual Power Supply circuit with IC 7812&7912

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12 Vdc Dual Power Supply circuit with IC 7812&7912

Description
The circuit given here is of a regulated dual power supply that provides +12V and -12V from the AC mains. A power supply like this is a very essential tool on the work bench of an electronic hobbyist.
The transformer T1 steps down the AC mains voltage and diodes D1, D2, D3 and D4 does the job of rectification. Capacitors C1 and C2 does the job of filtering.C3, C4, C7and C8 are decoupling capacitors. IC 7812 and 7912 are used for the purpose of voltage regulation in which the former is a positive 12V regulator and later is a negative 12V regulator. The output of 7812 will be +12V and that of 7912 will be -12V.

Circuit diagram with Parts list

Notes
  • Assemble the circuit on a good quality PCB.​
  • Transformer T1 can be a 230V primary; 15-0-15 V, 1A secondary step-down transformer.​
  • Fuse F1 can be a 500mA fuse.​
  • Capacitor C1,C2,C5 and C6 must be rated at least 50V.​
 

Eklentiler

  • regulated-dual-power-supply-circuit.jpg
    regulated-dual-power-supply-circuit.jpg
    45,6 KB · Görüntüleme: 4
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+/-12V DUAL POWER SUPPLY

Product_Image.jpg
This project is a solution to power up most of devices or projects requiring dual (+/-12V) power supply.

DESCRIPTION
Symmetric +/-12 VDC power supply has been designed for audio applications, can power up microphone pre-amplifier, audio buffers, audio mixer, distributions amplifier, headphone amplifier, VU meter and few o other equipment or projects required dual supply.

SPECIFICATIONS
  • Mains supply input 240 VAC
  • Step Down Transformer 15-0-15V AC @ 350mA.
  • Output +/- 12 VDC Dual, 350 mA
  • Regulated Low ripple DC output
  • Earth connection for chassis ground
  • Onboard regulator for stable supply
  • Dual output LED indication
  • Supply input & output via screw terminal connector
  • Dual unregulated output +/- 22 VDC via berg connector
SCHEMATIC
Schematic42-e1427710911329.png
PARTS
BOM_th-e1427710969660.png
PCB

 

Eklentiler

  • power_supply.pdf
    324,1 KB · Görüntüleme: 5
  • +_-12V Dual Power Supply - Electronics-Lab.zip
    2,9 MB · Görüntüleme: 12






 

Eklentiler

  • DC Dual Power supply Circuit diagram,12v,15v, 9v Regulated Dual Power Supply.zip
    3,5 MB · Görüntüleme: 13
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