How to build a 5V regulated electronic power supply using 7805
This circuit is based on the common and well known 7805 voltage regulator IC. the 7805 can supply requlated +5V supply output and 1A (ampere)current.
Most digital circuits need +5V regulated supply so this circuit can be useful. The input voltage to this circuit must be atleast +7V DC to get +5V DC out, this circuit will not work if you input 5V,6V, to 7805.
Because these 78XX ICs requires 2V greater voltage than output voltage example : you have a 6V powersupply and want to get 5V out of it, you can’t use 7805 for this purpose, Because 7805 needs 7V input to output 5V.
You can input upto 30-35V DC in input pin and you will get regulated +5V output.
The last two digits of 78XX indicate the output value. As an example, 78″05″ indicates that it can output max 5V and “7808” can output max 8V And “7812” can output max 12V.
The capacitor value depends on the voltage you give to input, You must use atleast a 25V capacitor in input if you want to input +12V, and always choose the value(voltage rating) of capacitors greater than input voltage.
You can directly replace 7805 with any 78XX Series regulator but input voltage should be greater according to the value of output.