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1. Department of Electronics and Telecommunication Engineering
Department of Electronics and Telecommunication Engineering
Mini project Title: Voltage Doubler
Circuit using 555 Timer IC
11-10-2023
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Name & Roll no:
• 352 Bhushan Sawant
• 353 Bharat Yadav
• 360 Afzal Shaikh
• 371 Rishabh Vishwakarma
Under Guidance of
Prof. M.K.Ahirrao

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Outline of the Presentation
Introduction
Background
Circuit Design
Testing and Results
Results and Conclusion
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Introduction Background Circuit Design Testing and Results Conclusions

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Introduction
• Motivation
• Background
• Block diagram
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Background Circuit Design Testing and Results Conclusions
Introduction

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Motivation
• The motivation for creating a voltage doubler circuit using a 555 timer IC
lies in the educational value, practical applications, and the opportunity for
hands-on learning and experimentation in the field of electronics. This
project can serve as an exciting and informative way to enhance your
electronics knowledge and skills.
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Background Circuit Design Testing and Results Conclusions
Introduction

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Background
• This project offers an opportunity to learn and gain practical experience in
electronics. It involves understanding the functioning of the 555 timer IC, diodes,
capacitors, and voltage doubling principles, which are fundamental in electronics
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Background Circuit Design Testing and Results Conclusions
Introduction

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Block Diagram
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Background Circuit Design Testing and Results Conclusions
Introduction
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5
5
Timer
IC
Power supply
(5v)
Resistors
Capacitors
1N4007
Diode
Multimeter
/Voltmeter

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Background
• Concepts
• History
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Circuit Design Testing and Results Conclusions
Introduction Background

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Concepts
The capacitor allows AC current to pass through it, but the diode only allows current to flow in
one direction. This creates a peak output voltage of 2*V pk across the diode. This extremely
simple circuit illustrates the concept, but it does not regulate the output DC voltage very well
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Circuit Design Testing and Results Conclusions
Introduction Background

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History
Greinacher circuit
The Greinacher voltage doubler is a significant improvement over the Villard circuit for a small cost in additional
components. The ripple is much reduced, nominally zero under open-circuit load conditions, but when current is
being drawn depends on the resistance of the load and the value of the capacitors used. The circuit works by
following a Villard cell stage with what is in essence a peak detector or envelope detector stage. The peak detector
cell has the effect of removing most of the ripple while preserving the peak voltage at the output. The Greinacher
circuit is also commonly known as the half-wave voltage doubler.
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Circuit Design Testing and Results Conclusions
Introduction Background

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Circuit Design & Working
• Circuit Interfacing Diagram.
• Working
• Main components and their specifications and principle of operation.
• Applications.
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Testing & Results Conclusions
Introduction Background Circuit Design

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Circuit Interfacing Diagram.
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Testing & Results Conclusions
Introduction Background Circuit Design

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Working
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Testing & Results Conclusions
Introduction Background Circuit Design
• A voltage doubler circuit using a 555 timer IC is an electronic circuit that takes an input voltage
and produces an output voltage that is approximately double the input voltage. The circuit
operates by generating an oscillating square wave signal using the 555 timer in its astable mode
and then using diodes and capacitors to double the voltage

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Components
• 555 Timer IC
• 1N4007 Diode -2
• Resistors 10K
• Resistor 33K
• Capacitor 22uF – 2
• Capacitor 0.01uF – 2
• 3V-12V Battery
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Testing & Results Conclusions
Introduction Background Circuit Design

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Components specifications
555 Timer IC :
• In astable mode, the 555 timer IC generates a continuous square wave output with a specific
frequency and duty cycle. The frequency and duty cycle are determined by the resistors R1 and
R2 and capacitor C1 connected to pins 2, 6, and 7 of the IC.
• 1N4007 Diode :
• 1N4007 rectifier diode has in total 2 pins, owns a cathode (-) and anode (+). In the schematic
symbol, the tip of the triangle with the line on top of it is the cathode. The cathode is marked on
the body of a diode by a band. It allows current flow through only one direction that means the
anode to the cathode only and never from the cathode to the anode – it likes a one current can
flow from way value.
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Testing & Results Conclusions
Introduction Background Circuit Design

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• Resistors:
• A resistor is the most basic electronic component invariably found almost every electronic
circuit. It is a passive element. The most important function of resistor is to resist the flow of
current. The property of a resistor is known as resistance.
• Capacitor:
• It provides the value of a capacitor C as farads moreover printed or color coded over the body of
the capacitor. Its units are Farads. Practical capacitors are available from 1pf to 1000 mF.
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Testing & Results Conclusions
Introduction Background Circuit Design

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Applications
• Low-power Devices
• LED Drivers
• Photoflash Units
• LCD Displays
• RF Transmitters
• Lab Experiments and Prototyping
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Testing & Results Conclusions
Introduction Background Circuit Design

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Testing & Results
This circuit's operation is the switching action of the diodes and the energy transfer between the
capacitors during each cycle of the 555 timer's square wave signal. By continuously repeating this
process, the circuit effectively doubles the input voltage, making it useful in various applications
where a higher voltage is required from a lower voltage power source.
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Introduction Background Circuit Design Conclusions
Testing and Results

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Testing
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Introduction Background Circuit Design Conclusions
Testing and Results

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Result
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Introduction Background Circuit Design Conclusions
Testing and Results

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Conclusion
• Summary
• Future Works
• Precautions
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Introduction Background Circuit Design Testing and Results Conclusions

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Summary
• The circuit is the one which doubles the voltage and consists of 2 capacitors and 2 diodes connected in the manner
shown in the circuit diagram. The 555-timer has multiple modes in which we have decided today to use astable
Multivibrator mode. This mode can be used to generate a square wave of approximately 2KHz using a
combination of two resistors and a capacitor. From the circuit, we can see that when the pin 3 of the timer IC has a
low output, then the diode D1 gets forward biased, which will charge capacitor C3 through it.
• Because the capacitor is charged directly from the supply, the capacitor will also get charged to the voltage equal
to the input voltage. When the pulse from the timer IC is high, the pin 3 of the IC will show a high output. This
will make the diode D1 reversed biased, and this blocks the charging of the capacitor C3 which has now been
charged to approximately the voltage equal to the supply voltage.
• When the diode D1 is reversed biased, the diode D2 will be forward biased, and this will charge the capacitor C4
through it. C4 capacitor will also be charge with the energy stored in capacitor C3. Now the capacitor C4 has
double the voltage of the input voltage because it is charged via two paths one from the capacitor C3 which was
charged initially to the supply voltage and another path is directly through the supply.
• In theory, the output of this circuit must produce a voltage at the output equal to double the voltage at the input, but
in reality, the charging and discharging of a capacitor is not a lossless process, the energy stored in a capacitor is
not fully transmitted to the other capacitor, and the charging of the capacitor is also not ideal.
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Introduction Background Circuit Desing Testing and Results Conclusions

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Further Improvements
• We can cascade the diode-capacitor arrangement at the output of 555 timer IC to generate much
higher voltages. The resulting circuit is called as a voltage multiplier circuit. It outputs a certain
times input voltage as output voltage. The factor by which the output voltage is more than the
input voltage is determined by the number of stages of capacitor+diode charge pump blocks
used
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Introduction Background Circuit Working Testing and Results Conclusions

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Precautions
• Due to the limitations of the timer IC, the input voltage of the circuit cannot be greater than 12V
and less than 3V, choosing a voltage between 3 and 12V will ensure safe working and no
damage will be done to the components.
• As discussed above, the working of the circuit depends on the charging and discharging of
capacitors, and hence, the circuit will not give output of required value right away as soon as the
circuit is plugged in with a supply voltage, but it will take a while before it settles at double the
input voltage.
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Introduction Background Circuit Working Testing and Results Conclusions

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Thank You
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References
• https://how2electronics.com/voltage-doubler-circuit-using-555-
timer-ic/
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