Monday, March 30, 2015

Circuit Schematic Precision MicroController Power Supply using LM7805 IC

Eltronicschool. - When you want to produce your microcontroller power supply, you need precision microcontroller power supply. In here we will give you Circuit Schematic Precision MicroController Power Supply using LM7805 IC like in figure 1 below. 

Lots of projects use the microcontroller (uC) as the ‘brain’ – for example as an intelligent controller in the prototype of a flying machine. Although there are a number of solutions for powering a microcontroller-based system, each type has its advantages and disadvantages, and you need to choose the one that suits the project concerned. Presented here is one ‘universal’ power supply unit for today’s microcontroller projects.

Circuit Schematic 





Component List
  • LM7805 : Fixed positive voltage regulator
  • LM1117-3.3 : 800mA low-dropout linear regulator
  • LM431: 3-terminal adjustable shunt regulator with temperature stability
  • FDN340P : P-Channel logic level MOSFET–2A, 20 V
  • 1N5817 : Schottky barrier rectifier 1A, 20V
Description

Circuit schematic like in figure 1 above is Circuit Schematic Precision MicroController Power Supply using LM7805 ICThe circuit is a compact power supply capable of providing +5 and +3.3V regulated outputs as VCCs (VCC1 and VCC2), and a stable +2.5V regulated output as a ‘clean’ reference voltage (VREF) for optional analog circuits linked up with the microcontroller unit. Since an input switching circuit is added for internal/external dc power supply selection, you can attach a ‘built-in’ 9V battery pack with the main power supply circuitry for implementing an ‘automatic power backup’ feature.



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