When we think about voltage regulator IC For General purpose and application specific circuit design then immediately IC 78XX will comes to our mind. Here the whole DC power supply setup is designed with IC 7805 and 7805 IC Circuit Diagram gives you typical circuit design and components requirement for 5V DC power supply unit.
Before constructing the voltage Regulator, we need to think about the circuit requirements for an example Input Supply (Vin) available and Output Supply (Vout) requirement and Current output and thermal protection etc.., An illustration gives you a concept of voltage regulator.
Characteristics of Voltage Regulator
Here Unregulated DC voltage is applied to a Voltage Regulator circuit and at output Regulated DC voltage obtained. Some circuit requires Constant voltage and constant current regulations.
- Step down transformer 0-9V AC / 1 amps
- Bridge Rectifier module or 1N4007 X 4
- Positive Regulator IC 7805
- Capacitors 47μF, 10μF and 0.1μF each one
IC LM7805 Pin diagram
IC 7805 is a three terminal positive voltage regulator, it can provide output current upto 1.5 A, It has internal thermal overload protection. IC LM7805 has high power dissipation capability and internal short circuit current limiting. This type of voltage regulator has wide range of applications.
Circuit Construction & Working
This 7805 IC Circuit Diagram designed to give fixed 5V DC at output, you can choose different voltage rating IC (78XX) and corresponding input power source to get desired output voltage range. Step down transformer used to reduce the AC supply voltage and then Bridge rectifier module used to convert AC into DC Supply then Filtered by using filter capacitors.
IC 7805 connected according to the pin directions then at the output filter capacitor is used to remove the distortions. When we apply supply to this circuit we can obtain regulated output (5) voltage with constant load current. IC 7805 Comes in different package size and we can choose depends on our circuit requirements.