+12V,-12V power supply using LM7812,LM7912

Here is circuit Power Regulator +12V,-12V. Use IC –LM7812 for +12V and IC LM7912 for -12V. This is circuit for Preamplifier play nice Music.Detail See in circuit.

I plan to show you, with an interesting concept.When I was make pre-amplifier circuit is small. I did not plan on the power supply. It requires low supply current is only 100mA. But the need for dual voltage. Or 3 line is +12 V,-12V and Ground. At that time, I have not the least knowledge and a few equipments. The regulator ICs I use IC7812 and IC7912 (hard to bought). I make this circuit. It works great.
notice point
In circuit I use diodes D1, D2, only both because I’d forgotten to add, and this is a low current, using a half-wave diode rectifier enough. and The transformer is 300mA -15V CT 15V that cheap than other sizes.
-IC1-IC2 do not need to hold the heat sinks because the very low currents.
-LED1 is indicator to Power ON that R1 is the current limiter of LED1.
-C1,C2,C3,C4 are first filter that time I has them many so place various 2200uF.

How to built.
This project I put them in peforated board, it easy to use, and so cheap. But at time I put wrong pin capacitor, when entering the power supply, causing it to burst. I was shocked very much.But I do not Discontinued this project.
All my experience, when I was young. About building electronic circuits.
Thank you for reading the poor English story.

Power Regulator +12V_-12V by 7812 , 7912

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6 Comments

  1. Ashutosh July 4, 2013
  2. Govinda Kumar NV April 12, 2014
  3. krunal patel November 24, 2014
  4. shekar December 11, 2014
  5. Jagadeesh Prasad January 31, 2017
  6. Jagadeesh Prasad January 31, 2017

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