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Voltage Doubler Circuit Using IC 4049

Summary

By: 
Anjali Sethiya
The circuit described here would produce an output voltage having twice the magnitude of the input voltage. In this circuit, we are using 6 Volts as input supply and we are getting 12 volts as its output. It is based on the popularly used hex inverter CD4049 IC. This can be made with the help of single IC with few more components.
CD4049 contains six inverter gates in one package as shown in diagram. In this, pin 3 is input and 2 is for output. For first gate similarly pin 5 is input and pin 4 is output for second gate similarly we have four more gates. Pin1 1 is for supply voltage and pin 8 is connected to ground. Pin 13 and 16 are unused.
 
 

Simple-LED-Image.jpg

 

Description

The voltage doubler circuit is based on NOT gate CD4049 IC. We are utilizing all 6 gates of NOT gate. To understand the working you should know about the truth table of NOT gate are as follows-

 

Input
Output
0
1
1
0

 

In NOT gate, we will get output as logic high when logic zero is provided and we will get logic zero when logic1 is provided in input.

 
CD4049 contain six inverter gates in one package as shown in diagram. In this pin 3 is in and 2 is for output for  first gate similarly pin 5 is input and pin 4 is output for second gate similarly we have four more gate. In this 1 is for supply voltage and pin is connected to ground and pin 13 and 16 are unused pin.
 
In this circuit we are utilizing all six gates of NOT gate. Firstly we have made an oscillator with the help of gate 3 and 4, capacitor C1 and resistor  R1. The frequency of oscillation is determined by the value of R1 and C1. The remaining gates are joined in parallel to act as a buffer. Input pins 3, 5, 14 and 11 are connected together and join to the frequency source from oscillator. Similarly we have connected all output pin 2,4,15 and 12 and terminated to voltage enhancer circuit.
 
A voltage multiplier circuit can be made with the help of a diode and a capacitor. This can be used to generate more output voltage than the supplied input. Here we are using most popular commonly used half wave series multiplier.
 
The requirement to make a voltage doubler circuit is 2 diodes, 2 capacitors and an oscillating voltage. As you can see from the circuit in this diode D1 is forward bias and conducts which in turns chare the capacitor C2 to the peak value of input voltage which now turns as a battery in series with the power supply. At the same time D2 conducts because of D1 and charges capacitor C3.Therefore voltage across C3 will be sum of supply voltage and voltage across C2. The main advantage of this voltage doubler circuit is that it allows higher voltage to be created from a low source without the need of a transformer.
 
Hence at the output of Diode D2 you can operate 12V relay with the help of 6volts supply. 

 

Circuit Diagram

Components

Resistor Image
Resistor

Resistor is a passive component used to control current in a circuit. Its resistance is given by the ratio of voltage applied across its terminals to the current passing through it. Thus a particular value of resistor, for fixed voltage, limits the current through it. They are omnipresent in electronic circuits.

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Capacitor image
Capacitor

 

 

Capacitor is a passive component used to store charge. The charge (q) stored in a capacitor is the product of its capacitance (C) value and the voltage (V) applied to it. Capacitors offer infinite reactance to zero frequency so they are used for blocking DC components or bypassing the AC signals. The capacitor undergoes through a recursive cycl...

1N4148 Diode Image
Diode 1N4148
1N4148 is a high speed switching diode. The switching diodes are designed such that their reverse recovery time is very small compared to ordinary diodes. The typical switching time is 4 nsec. It comes in hermetically sealed leaded glass package. The PIV rating is 100V. The maximum repetitive peak forward current is 450 m...
Relay Switch Image
Relay Switch

Relay is an electromagnetic device which is used to isolate two circuits electrically and connect them magnetically. They are very useful devices and allow one circuit to switch another one while they are completely separate....

Step-By-Step

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