Sunday, April 6, 2014

Symmetric Power Supply +5V,0,-5V Circuit Diagram using LM7805 and LM7905

Robotronicdiagram. - There are many kind of circuit diagram of power supply that develop to support the supply the electronic device. There is any power supply that only give positive and ground polarity or negative and ground polarity that all called asymmetric power supply. But there is any power supply that can give positive, negative, and ground polarities that called symmetric power supply.

There are many symmetric power supply that developing depend on voltage that needed as like 5 volt, 12, volt, 18 volt, etc. In here we will show you symmetric power supply +5V,0V,-5Volt that using IC LM7805 and LM7905 as the 5Volt voltage regulate. 

Circuit Diagram

Figure 1. Symmetric Power Supply +5V,0,-5V Circuit Diagram using LM7805 and LM7905

  1. T1 = Step down Transformer 1 ampere, 6 Volt , CT
  2. D2 = Bridge diodes
  3. C1, C2 = 2200uF/16V
  4. U1 = LM 7805
  5. U2 = LM 7905
  6. C3, C4 = 220uF/16V


Circuit diagram like in figure 1 above is Symmetric Power Supply +5V,0,-5V Circuit Diagram using LM7805 and LM7905. We will try to describe the circuit diagram above as follow:
  1. Input voltage of the transformer T1 is 220 Volt with output voltage 6 Volt with CT.
  2. We use bridge diodes D1 to change ac voltage from transformer into dc voltage this is positive and negative 5 volt.
  3. C1 and C2 using as DC stabilization 6 volt.
  4. IC LM 7805 used to regulate voltage 6 volt into +5Volt, and IC LM 7905 used to regulate voltage 6 volt into -5Volt.
  5. To make out more stabilize we used C3 and C4 in output voltage.
Note: to avoid the more heat on IC LM7805 and IC LM7905 you must use heat sink.


You can design, draw, and also simulate your electronic project as like when you want design Symmetric Power Supply +5V,0,-5V Circuit Diagram using LM7805 and LM7905, you can use Electronic Workbench version 5.12. You can download this software with click link below:

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