9V Dual Power Supply from Single Battery

Introduction

We’ve talked about power supplies in a lot of our articles, and we’ve built a lot of different power supplies. A power supply, as you may know, is an electronic circuit that supplies a range of AC and DC voltages to enable devices to function. The power supply can be single or dual. A single supply creates only one voltage, but a dual supply produces two voltages, one positive and one negative. This article focuses on the dual power supply in particular. So we have decided that in this tutorial, we are going to make a “Dual Power supply from a single battery”.

The circuit requires very basic and simple electronic components, that are easily available everywhere. Moreover, it utilizes only a single 9V DC battery to generate the dual supply.

Hardware Components

The following components are required to make a Dual Power Supply Circuit

S.no	Component	Value	Qty
1.	IC	NE555 Timer	1
2.	IC	LM7909	1
3.	Diode	1N4007	4
4.	LED	–	1
5.	Electrolytic Capacitor	1uF, 220pF	2,4
6.	Ceramic Capacitor	10nF, 47uF	1,1
7.	Resistor	270Ω, 100KΩ	2,2
8.	Battery	9v	1
9.	Connector	2-Pin, 3-Pin	2,1

NE555 IC Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of 555 Timer

Dual Power Supply Circuit

Working Explanation

In this Dual Power supply from a single battery, there is a 555 timer IC to oscillate the pulses, we may rectify these pulses into -ve supply using diodes and regulate negative voltage using IC 7909.

The main power source battery provides a positive 9 Volt supply that is directly fed to the output connector, and the timer IC produces pulses at the output using resistors R1, R2, and capacitor C1 timing components. These pulses are converted to a negative direction and regulated by the negative regulator IC7909, and then this negative voltage and GND supply are given at the output connector.

Application and Uses

• Charging circuits.
• Power banks.
• Different electronic devices and circuits