9V Dual Power Supplyfrom 3V

Last Updated on March 10, 2024

Wonder how you can draw 9 Volt Dual power supply from 3V that is from two AA size battery, here is the circuit for 9V Dual Power Supplyfrom 3V by using Timer IC 555. This circuit can constructed by easily available components and it will give you +9 Volt and -9 Volt power supply output. It can be used in need but it has one small problem that is, it will give mA range current output only.

Main part of this circuit is Timer IC 555 and it is works as Astable Multivibrator, By using the continuous Square wave pulse we bring + and – supply output. Output Frequency of Timer IC 555 depends on the Timing Resistor (R1, R2) and Timing Capacitor (C1) hence the tolerance value of these components affects output frequency, Check the output voltage with the help of multimeter before using it in applications.

Circuit Diagram

List of Components

  1. Timer IC 555
  2. Diode 1N4007 = 4
  3. Resistor 1KΩ, 10KΩ each one
  4. Capacitors 10µF = 2, 4.7µF =2
  5. Capacitor 470pF, 0.01µF each one

Construction & Working

This circuit contains two parts one is Astable Multivibrator and second one is Clamping Rectifiers, and the square pulse signal from 555 is used as input to clamping section. Positive Clamper lifts pulse signal and gives +9V by the way Negative Clamper pushes signal to negative and gives -9V. Electrolytic capacitors C3, C4 and C5, C6 are used for charging / discharging and to filter the output supply.

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