Project Hub /Basic Analog & Power Electronics/Power Supplies & Voltage Regulators/Voltage Doubler Circuit

Beginner

ANALOG / DISCRETE

< ₹500

3 – 6 Hours

Partial Kit

Voltage Doubler Circuit

Q: Why is the input voltage strictly limited to 3-12 volts?

Standard 555 timer ICs have a maximum voltage rating limit; exceeding 12 volts can permanently damage or destroy the internal silicon structure of the chip.

Q: Can I connect a high-power motor or heavy load to the output?

No, the output load should not draw more than 70mA of current because this charge-pump design is intended for low-current applications and higher draws will cause the output voltage to collapse.

Q: Do I need to write any microcontroller code or software for this circuit?

No software is required at all, as this is a purely analog and discrete hardware project governed entirely by the passive components and the 555 timer.

A simple and practical circuit that uses a 555 timer IC in astable mode along with diodes and capacitors to double an input DC voltage.

Originally published on CircuitDigest

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

10pcs - 220 ohm 1/4 W Resistor Set Rs. 39.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

This list includes a generic resistor set as a placeholder — it is not matched to the exact value or part number this circuit needs. The correct one is specified on the original source page linked above; check it before buying.

We don't carry yet: 555 Timer IC
Diodes (1N4007 / 1N4148 / Schottky / Zener)
Capacitors

Browse all components

How It Works

The Voltage Doubler Circuit operates by using a 555 timer IC configured in astable mode to generate a continuous square wave oscillation. Powered by a 3 to 12V DC source, the timer uses a 10k resistor, a 33k resistor, and a 0.01uF capacitor to determine its switching frequency and timing cycle. As the 555 timer output alternates between high and low voltage states, it drives a charge-pump network composed of two 1N4007 diodes and two 22uF electrolytic capacitors. During one half of the oscillation cycle, the first capacitor charges up to the input supply voltage. When the 555 output flips to the opposite state, it acts in series with the stored charge, pushing the voltage higher through the switching action of the diodes. This alternating charge and transfer mechanism effectively accumulates and doubles the DC input potential at the output stage, allowing a low-voltage power supply to provide a higher DC voltage level for low-current loads.

Why Build This

Generate a higher DC voltage from a simple 3-12V battery or low-voltage power source without needing an expensive or bulky transformer.

Learn foundational analog power electronics and charge-pump principles using accessible discrete components.

Practice configuring a classic 555 timer IC in astable mode to produce a reliable clock or switching signal.

Real-World Application

Generating higher low-current DC voltages from a low-voltage power source without needing a bulky transformer.

Skills You'll Learn

555 timer astable configuration

charge-pump circuit operation

diode-capacitor voltage multiplication

square wave generation

basic DC power management

Safety Precautions

Input voltage must be kept between 3-12 volts; higher voltages will destroy the 555 timer IC. The output load should not draw more than 70mA current.

Technology Tags

555 TIMER IC

ASTABLE MULTIVIBRATOR

DIODES

CAPACITORS

VOLTAGE DOUBLER

POWER SUPPLY

Frequently Asked Questions

Why is the input voltage strictly limited to 3-12 volts?

Standard 555 timer ICs have a maximum voltage rating limit; exceeding 12 volts can permanently damage or destroy the internal silicon structure of the chip.

Can I connect a high-power motor or heavy load to the output?

No, the output load should not draw more than 70mA of current because this charge-pump design is intended for low-current applications and higher draws will cause the output voltage to collapse.

Do I need to write any microcontroller code or software for this circuit?

No software is required at all, as this is a purely analog and discrete hardware project governed entirely by the passive components and the 555 timer.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

PRJ-00012

Voltage Doubler Circuit

Parts You'll Need

How It Works

Why Build This

Real-World Application

Skills You'll Learn

Safety Precautions

Technology Tags

Frequently Asked Questions

Gallery

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