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In most of our microcontroller based products we need 5v regulated power supply. Voltage fluctuations may result in undesirable effect on an electronic system, so to maintaining a steady constant voltage is necessary according to the voltage requirement of a system. Here we provide simple voltage regulator circuit using 7805 IC.
7805 is a voltage regulator integrated circuit. It is a member of 78xx series of fixed linear voltage regulator ICs. Which restricts the voltage output to 5V. It comes with provision to add heatsink.The maximum value for input to the voltage regulator is 35V. It can provide a constant steady voltage flow of 5V for higher voltage input till the threshold limit of 35V. If the voltage is near to 7.5V then it does not produce any heat and hence no need for heatsink. If the voltage input is more, then excess electricity is liberated as heat from 7805. Pin 1 is input voltage that has to be applied, pin 2 is ground and pin 3 is output regulated voltage. Diode 1N4007 prevents negative voltages to the 7805 IC. C1& C2 provides filtered output. When regulated voltage coming to the output terminal LED will glow. This circuit can connect any of power supply sections if regulated 5v is needed.
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