7805 Regulated +5V Power Supply
Well most of you must be wondering that this is going to be a hub about all those electronics stuffs that we have in our home,yes its kindly related to that but with a difference that this hub brings you the inside of all these gadgets that is there electronic circuits. In this hub I will give you the most basic cricuit electronic circuit for hobbists and students.So lets join the world of electronics.
To make things really simple lets start with a simple power supply,and it is also the one they usually give you in your first electronics project.Well the reason is quite obvious because all electronis circuits require a DC power supply to work.You really do plug in the wires of your electronic items in AC mains supply but they do have AC to DC converters to to provide DC to the circuits.All this is done with a power supply in the right place.
This circuit is a small +5V power supply.The circuit will provide a regulated voltage to the external circuit which may also I am required in any part of the external circuit or the whole external circuit.The best part is that you can also use it to convert AC voltage to DC and then regulate it ,simlpy You need a transformer to make the AC main drop down to a safe value i.e 12-15 volts and then us a rectifier to convert AC into DC.
This circuit can give +5V output at about 150 mA current, but it can be increased to 1 A when good cooling is added to 7805 regulator chip. The circuit has over overload and therminal protection. The capacitors must have enough high voltage rating to safely handle the input voltage feed to circuit. The circuit is very easy to build for example into a piece of veroboard.
If you need other voltages than +5V, you can modify the circuit by replacing the 7805 chips with another regulator with different output voltage from regulator 78xx chip family. The last numbers in the the chip code tells the output voltage. Remember that the input voltage muts be at least 3V greater than regulator output voltage ot otherwise the regulator does not work well.
Dont forget to check the pin diagram before connecting the IC.
Pin diagram for 7805
- 1. Unregulated voltage in
- 2. Ground
- 3. Regulated voltage out