How to Make a Simple DC to DC Voltage Doubler Circuit Diagram, Using IC 4049

The following circuit can  be used for doubling any DC source voltage (up to 15 V DC). The presented design will double any voltage between 4 to 15 V DC and will be able to operate loads at current not  more then 30 mA.
As can be seen in the diagram, this DC voltage doubler circuit employs just a single IC 4093 for achieving the proposed result.

The IC 4093 has six gates in all which are all effectively for generating the discussed voltage doubling actions.

Two of the gates out of the six are configured as an oscillator. The extreme left of the diagram shows the oscillator section.

The 100 K resistor and the 0.01 capacitor form the basic frequency determining components.

A frequency is imperatively required if a voltage stepping actions needs to be implemented, therefore here too the involvement of an oscillator becomes necessary.

These oscillation become useful for initialing the charging and discharging a set of capacitors at the output which amounts to the multiplying of the voltage across the set of capacitors in a such a way that the result becomes twice the applied supply voltage.

However the voltage from the oscillator cannot be preferably applied directly to the capacitors, rather its done through a group of gates of the IC arranged in a parallel way.

These parallel gates together produce a good buffering to the  applied frequency from the generator  gates so that the resultant frequency is stronger with respect to current and does not falter with relatively higher loads at the outputs.

But still keeping the specifications of a CMOS IC in mind the output current handling capacity cannot be expected to be larger than 40 mA.

Higher loads than this will result in the deterioration of the voltage level toward the supply level.
The output capacitor values can be increased to 100uF for getting  reasonably higher efficiency levels from the circuit.

With 12 volts as the supply input to the IC, an output of around 22 volts may be acquired.

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  1. Hi hitman (I hope you are NOT a real hitman, hehe),
    We have seen DC to DC voltage doubler circuits with IC 4049, or IC 555 or with some transistors (usually compromising some current) but isn't there a way to double (or at least increase) current without sacrificing voltage? IC 4049 can double the voltage but with max 30mA current or IC 555 with max 50mA but isn't there anyway to double the voltage and current with high amperage current? But then if we can double or triple the voltage and current as well, problably it would be like asking for free energy, isn't it? Anyway, your insights will be greatly appreciated. Thank you.

    1. Hi Jennifer, i wish I could be like him....I like playing hitman very much!

      Regarding free energy one should always remember that you cannot generate anything above the input, in fact the output will be always less than the input.

      Same is true for the above circuit, even a high current voltage doubler circuit would provide a shade less power (V x I) than the fed total input power (V x I)

      One such design has been discussed in this article:

      I appreciate your interest in electronics, normally girls don't enjoy technical subjects.


    2. Thank you for your nice reply. I think it is just the quest for a feasible and cheap alternative energy (that is what I am interested in) is what driving me to enter into technical arena like this (though my background is not in physics or electronics) and that is why I ask many questions. I like to understand how and why your circuits works and how you derive to certain calculations (voltage, current, resistance, etc.) rather than just following the circuits without understanding it. Your ideas are very impressive and interesting. I will be asking you more questions over the period of time. By the way, how would you light your room with a solar power if you are living in the 19th floor of a 33 story building where you would not be able to wire your solar panel/battery from the roof to all the way to your room? Maybe when your inductive battery charger is capable of charging a battery in your room with the solar panel mounted on your roof? Do you see this is happening in the near future?

    3. You are welcome Jennifer!

      The inductive transfer of power so far is an inefficient technique, and doesn't look feasible until super conductors or super PV cells become a reality and easily accessible.
      Deriving solar power somewhere at the middle of a high storey building presently would be achievable only through cables, no other option looks great! However one option would be to transform the windows and the walls of the building into solar energy generating devices.

      Recently I watched "ecoplolis" on discovery channel, an excellent program which presents future scientific prospects, and ways to deal with the growing power crisis, and pollution in most innovative methods.

      An excerpt can be viewed here.

  2. hello sir how are you
    pls tell me sir how to calculate resistance and capacitance value for ic is there any formula
    i found one in led chaser f= 1/1.39xRxC f is frequency is this correct whats 1.39 here sir pls tell me sir how to do it

    1. Hello Puneet, the C will need to be in Farads, did you convert it in farads first??

  3. microfarad will need to be first converted to Farads for getting correct results

  4. sir, we have research study now, and its all about 12 volts dc to 24 volts dc voltage multiplier. and our teacher ask how to calculate from 12 volts to 24 volts dc theoretical solution.
    she want to have solution.
    we give here a formula which Vout=2 x Vin., and she said wrong...
    sir is there any solution for that?
    thankx sir...

    1. For a boost converter or a transformer voltage doubler the formula could be

      V(in) x I(in) = V(out) x I(out)

    2. just for you Swagatam : tell teacher is like getting boob job,double to start out with then fall down as it age

  5. can u please state the diode spec its not proper i need to build this circuit

    1. diodes are 1N4148, or 1N4007 will also do....

    2. thank you i was really inneed of this doubler

    3. you can also refer to this article


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