Almost all electronic devices used in electronic circuits needs a dc source of power to operate. The source of dc power is used to establish the dc operating point for the passive and active electronic device in-corporate in the system.
These day’s almost all circuits 5V regulated power supply but operational amplifier requires dual power supply (positive and negative) for proper operation, while we are using battery power supply for circuit then it would be difficult to get dual polarity power supply. In order to overcome this type of problem. Here, we have designed dual polarity 5V power supply from 9V battery.
Circuit Description Dual Polarity 5v from 9v Battery
The circuit diagram of dual polarity 5V is built around fixed voltage regulator IC 78L05 (IC1) and a voltage converter IC ICL7660 (IC2) IC 7660 is a CMOS switched-capacitor voltage converted which convert positive voltage to negative voltage.
9V battery is connected to input pin (pin 3) of IC1 of IC1 which converted it to regulated 5V supply. This output (+5V) is given to Vcc pin (pin 8) of IC2. Capacitor C3 and C4 with the help of IC2 converts +5V to -5V dc. This output (-5V) is taken from pin 5 of IC2.
Construction and Testing of Dual Polarity 5v from 9v Battery
The PCB design (solder side and solder side) of dual polarity 5V power supply is shown in figure 2 and 3 respectively.
Figure 2: Solder Side PCB Diagram of Dual Polarity 5V power Supply
Figure 3: Component Side PCB Diagram of Dual Polarity 5V power Supply
The simulated circuit of dual polarity 5V power supply circuit is shown in figure 4.
PARTS LIST OF DUAL POLARITY 5V FROM 9V BATTERY
|C1 = 470 µF/25V
C2 = 2.2 µF/16V
C3, C4 = 10 µF/16V
|IC1 = 78L05
IC2 = ICL7660