Specifications

Chapter 6 - Samples

likely that a man who is breathing in fresh air will live longer than a man who's living in a polluted

environment.

For a proper function of any microcontroller, it is necessary to provide a stable source of supply, a

sure reset when you turn it on and an oscillator. According to technical specifications by the

manufacturer of PIC microcontroller, supply voltage should move between 2.0V to 6.0V in all

versions. The simplest solution to the source of supply is using the voltage stabilizer LM7805

which gives stable +5V on its output. One such source is shown in the picture below.

In order to function properly, or in order to have stable 5V at the output (pin 3), input voltage on

pin 1 of LM7805 should be between 7V through 24V. Depending on current consumption of device

we will use the appropriate type of voltage stabilizer LM7805. There are several versions of

LM7805. For current consumption of up to 1A we should use the version in TO-220 case with the

capability of additional cooling. If the total consumption is 50mA, we can use 78L05 (stabilizer

version in small TO - 92 packaging for current of up to 100mA).

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