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You are here: Home / Power Supply Circuits / 12V DC to 220V DC Boost Converter Circuit

12V DC to 220V DC Boost Converter Circuit

Last Updated on January 18, 2025 by Swagatam 115 Comments

In this article I have explained a very simple method of acquiring 220V DC from a 12V DC source. The idea utilizes inductor/oscillator based boost topology with the help of the IC 555.

Table of Contents
  • Circuit Operation
  • Circuit Diagram
  • How to Calculate the Inductor

Circuit Operation

Referring to the circuit diagram below, we see that the entire idea is based upon the versatile, evergreen IC 555.

Here it's configured in its standard astable multivibrator mode for generating the required pulses at a frequency determined by the resistors 4k7, 1k and the capacitor 680pF.

The duty cycle may be appropriately adjusted by experimenting the 1K resistor.

The output is received at pin#3 of the IC, which is fed to the gate of an N-channel mosfet.

When power is switched ON, the positive pulses emanating from pin#3 switch ON the mosfet into full conduction.

During the above periods the 12V high current potential is pulled to ground via the coil by the mosfet.

As we all know inductors always try to oppose instant changes in current polarity through it, therefore during the negative pulses when the mosfet remains switched OFF, forces the coil to dump the stored potential in it in the form of high voltage EMF pulse into the output.

This voltage may be equal to 220V DC and gives rise to the required potential at the shown outlet of the circuit.

The above straightforward operation is repeated continuously at the given frequency providing  a sustained 220V DC at the output.

The BC547 and its base network is introduced for limiting the output voltage to the required degree.

For example if the required output is 220V, the 47K preset may be adjusted such that the220V mark never exceeds, irrespective of the coil back emf rate or the input voltage fluctuations.

The mosfet can be any 400V, 50 amp type, for example a NTD4302 may be used.

The coil wire should be thick enough to hold up to 30 or more amps.

Circuit Diagram

12V to 220V boost converter circuit diagram

NOTE: THE MOSFET IS MISTAKENLY SHOWN AS IRF540, WHICH IS NOT APPROPRIATE FOR THIS APPLICATION, SO PLEASE REPLACE IT WITH AN IRF740 MOSFET.

WARNING: THIS CIRCUIT INVOLVES HIGH VOLTAGE, EXTREME CAUTION IS ADVISED WHILE HANDLING THIS CIRCUIT.

IC 555 Pinout Details

IC 555

Mosfet IRF740 Pinout Details

Mosfet IRF740 Pinout Details

How to Calculate the Inductor

Let's assume the maximum output current required is 5 Amps.

Then the total power output will be 220 * 5 = 1,100 Watts approximately.

So the maximum input current must be 1,100/12 = 92 Amps approximately.

The formula for calculating the Inductor is:

L = (Vin * D * (1 - D)) / (fs * ΔIL)

Where Vin = Input Voltage = 12 V

D = Duty cycle. This can be calculated as follows:

D ≈ 1 - (Vin(min) + Vds + Vf) / Vout

Where:

  • D: Duty cycle
  • Vin(min): Minimum input voltage
  • Vds: Voltage drop across the MOSFET
  • Vf: Voltage drop across the diode
  • Vout: Output voltage

So, D ≈ 1 - (Vin(min) + Vds + Vf) / Vout

D ≈ 1 - [(12V + 0.5V + 0.7V)]/220V]

= 1 - 0.06 = 0.94

So, D = 0.94

fs = the 555 frequency at pin#3 or the MOSFET gate, let us assume the frequency to be around 300 kHz according to the R1, R2, C1 values for the IC 555 timing components.

ΔIL = Ripple current. Typically, the ripple current of 20-30% of the output current, so here it will be around 0.2 * 5 = 1 Amp

So, now let's plugin the above values in our Inductor formula:

L = (Vin * D * (1 - D)) / (fs * ΔIL)

= (12 * 0.94 * (1 - 0.94)) / (300000 * 1)

= 0.67 / 300000

= 0.0000022333 H or 2.2333 µH

So the value of the Inductor should be 2.2333 µH for getting 5 amp maximum output.

You'll also like:

  • 1.  12 V to 30 V High Current Boost Converter Circuit [Variable]
  • 2.  Simple Crowbar Circuits for Over-voltage Protection
  • 3.  Designing Simple Power Supply Circuits
  • 4.  110V, 14V, 5V SMPS Circuit – Detailed Diagrams with Illustrations
  • 5.  24V to 12V DC Converter Circuit [using Switching Regulator]
  • 6.  Simplest One Transistor Regulated Power Supply Circuit

About Swagatam

I am an electronics engineer with over 15 years of hands-on experience. I am passionate about inventing, designing electronic circuits and PCBs, and helping hobbyists bring their projects to life. That is why I founded homemade-circuits.com, a website where I share innovative circuit ideas and tutorials. Have a circuit related question? Leave a comment.... I guarantee a reply!

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Next Post: How to Design an Inverter – Theory and Tutorial »

Reader Interactions

Comments

  1. umar Ashru says

    October 30, 2024 at 2:54 am

    what are the nmber of turns and size of wire

    Reply
    • Swagatam says

      October 30, 2024 at 8:24 am

      The number of turns will depend on the 40uH value, make the winding until the 40uH is achieved. The wire thickness will depend on the load current, for this project a 1mm copper should be quite enough for delivering 220V, 200 mA current output.

      Reply
  2. Andrew says

    August 7, 2024 at 2:50 am

    I can’t see the AC side of this circuit… looks like a boost converter can you explain how the ac signal is generated and captured? I’m really interested in what I’m missing here. Boost yes. Using the mosfet to switch short the inductor and capture the EMF. The BC547 regulates as described but maybe I’m misunderstanding something. Can you explain in detail? Thanks a lot Andrew

    Reply
    • Swagatam says

      August 7, 2024 at 8:24 am

      Sorry about the confusion, you are correct!
      It is actually a 12V DC to 220V DC boost converter circuit.
      I have now changed the article content and the title accordingly.

      Reply
  3. amfarina says

    July 12, 2024 at 4:46 pm

    Hi
    In order to work the mosfet have to be rated for Vdrain = Vout+Vf(diode). So IRF540 doesn’t fit for this application because his Vd max is 100V

    Reply
    • Swagatam says

      July 12, 2024 at 6:08 pm

      You are absolutely right, please upgrade the MOSFET to IRF840.

      Reply
    • Andrew says

      August 7, 2024 at 2:51 am

      Agree

      Reply
    • Swagatam says

      October 30, 2024 at 8:28 am

      Sorry, you are absolutely correct, please change the MOSFET to IRF840…

      Reply
  4. OYO MARK says

    October 25, 2023 at 9:20 am

    How is the above inductor wounded and using which wire

    Reply
    • Swagatam says

      October 25, 2023 at 11:14 am

      You can wind a 1mm thick super enameled copper wire over a ferrire rod. Create number of turns which produces 40 uH value

      Reply
  5. Aref says

    March 30, 2023 at 7:15 am

    Excellent…
    thank you

    Reply
  6. William H. Blair says

    March 22, 2023 at 6:12 pm

    i want to use a 12v dc motor mechanically coupled at the shaft to another motor shaft of a 220v ac motor– the idea is to get 220v from the driving force of the 12vdc motor. am currently doing this with a hydro generator. again the idea is to have the 12v motor make the 220v ac motor supply power to feed itself with the proper invertors in line . can this work.

    Reply
    • Swagatam says

      March 22, 2023 at 6:27 pm

      That is definitely possible, however the output power of the 220V motor will be just 70 or 80% of the 12V motor power.

      Reply
  7. Wai Phyo says

    March 11, 2023 at 8:34 am

    How much time can I use from DC 12v 45 AH to AC 220v 65W?

    Reply
  8. Pierre Leo Besaans says

    December 11, 2022 at 2:54 pm

    Hi, I need to build a transformer to be used as a inverter. 12vdc input to 220vac output at 50 hertz.
    The total load the transformer must be able to take is 4 KW. I would very much like to know the wire size in mm for the 220vac side, the thickness of the wire and the number of turns.
    The same applies to the 12vdc side having a center tap.
    If you have a schematic, using normal components for the low voltage side to create the 50 hertz, using Mosfets. I would need a pure sine wave and not a square wave.
    I would really appreciate your help.

    Reply
    • Swagatam says

      December 11, 2022 at 8:30 pm

      Hi, I do not have the details of the wire size for the transformer, it will need to be selected from a chart or a table maybe.
      You can probably refer to the following article for any details:
      https://www.homemade-circuits.com/how-to-make-transformers/
      For the sine wave inveretr you can try the following concept:
      Arduino Pure Sine Wave Inverter Circuit with Full Program Code

      Reply
  9. Ronc says

    September 18, 2022 at 7:43 am

    Thank you very much for your helpful circuits

    Reply
  10. sunil says

    June 20, 2022 at 8:29 am

    fish shocker circui

    Reply
    • Swagatam says

      June 20, 2022 at 10:34 am

      Can you explain more.

      Reply
  11. Željko Kiš says

    April 23, 2020 at 11:18 pm

    Coil about 40 mikrohenry-how many turns on what(Ferrite ring,ferrite EE trafo or)Which diameter off wire?How many ampers in outside,outside power?

    Reply
  12. Krish says

    May 5, 2019 at 10:53 pm

    Can I run a1or 2 hp water pump ? Thank you very much.

    Reply
    • Swagatam says

      May 6, 2019 at 10:29 am

      No, you cannot run 2 hp load with this circuit

      Reply
      • Krish says

        May 6, 2019 at 9:55 pm

        Then what I’ll do if I want to do this?I mean Is there any circuit or electonic devices you know to run 1hp load with DC? Thanks a lot….

        Reply
        • Swagatam says

          May 7, 2019 at 8:25 am

          you will need a 24V to 220V inverter 1 kva

          Reply
  13. Shigida says

    May 6, 2018 at 10:27 pm

    Hello Swagatam!
    Can this circuit be used to power the “Cell Phone Battery Charger Station in Villages “(www.www.homemade-circuits.com/installing-solar-universal-cell-phone/)

    Reply
    • Swagatam says

      May 7, 2018 at 8:07 am

      Hi Shigida, yes it can be used after proper adjustments

      Reply
      • Shigida says

        May 7, 2018 at 11:22 pm

        Swagatam,Thanks a lot.
        would you mind telling me which part and how to adjust the ckt in order to get posibilly more watt out of it?

        Reply
        • Swagatam says

          May 8, 2018 at 9:12 am

          Shigida, you will have to manually experiment with trial and error, and find out which frequency produces the maximum voltage output, once this is fixed then you can replace the coil with a thicker wire coil for upgrading the current capacity of the coil.

          Reply
  14. Abhinaya says

    May 13, 2017 at 4:33 pm

    If I convert a 12 or 15 or 50v to 230v can I connect this to home appliances if it is possible means please explain it in detail and if not means give the solution to implement the home appliances to it.

    Reply
    • Swagatam says

      May 14, 2017 at 2:29 pm

      you can connect appliances which are SMPS based for exmple TV sets, LED lamps, amplifiers but not that require AC sinewave inputs like refrigerators, mixers, fans etc.

      Reply
  15. Ainsworth Lynch says

    February 17, 2017 at 1:26 am

    I can fool around with the RC timing parts of the ic to get the frequency but can you assist me with the coil, how man turns do you think I would need to get such high voltage.

    Reply
    • Swagatam says

      February 17, 2017 at 2:27 pm

      you can try 100 turns initially, for more info you can refer to the following article

      https://www.homemade-circuits.com/2015/10/calculating-inductor-value-in-smps.html

      Reply
  16. Ainsworth Lynch says

    February 15, 2017 at 10:10 pm

    Can I adjust this to get about 40 to 60khz at about 400v ac?

    If so do you have any idea how much turns I would need on the inductor.

    Reply
    • Swagatam says

      February 16, 2017 at 9:36 am

      yes that's possible by appropriately setting the coil dimension and the RC timing parts of the Ic

      Reply
  17. swapan says

    February 12, 2017 at 11:44 am

    Sir, please, give me a..idea about dc to dc converter from 12volt to 36volt for my 30watt 36volt led chip.because,i have to drive this led light from 12volt battery…

    Reply
    • Swagatam says

      February 14, 2017 at 5:19 am

      Swapan, you can try the concept which is explained in the above article.

      Reply
  18. swapan byapari says

    June 21, 2016 at 1:27 pm

    I need a circuit of 500 watt 12 volt DC to 15 volt DC converter

    Reply
  19. Samuel Budiyanto says

    June 12, 2016 at 1:37 am

    You make a mistake; put a high speed diode after switching.
    If you work with SMPS, high speed diode always needed!

    Reply
    • Swagatam says

      June 12, 2016 at 4:07 pm

      thanks, I have corrected it now!

      Reply
  20. Miracle says

    June 4, 2016 at 11:27 am

    Thank you Manjumdar for sharing your ideas regarding this circuit built. It has been really helpful.

    Reply
    • Swagatam says

      June 5, 2016 at 5:16 am

      you are welcome Miracle.

      Reply
  21. swapan byapari says

    June 2, 2016 at 3:45 am

    I am trying to tell you that if 150 watt voltage booster inverter is connected to 150 watt battery,without any load or minimum wattage of load on inverter.Then,battery backup depends on inverter rating or load rating????

    Reply
    • Swagatam says

      June 2, 2016 at 2:43 pm

      it will obviously depend on the load, without a load the inverter will consume negligible amount of current.

      Reply
  22. SUDIP BEPARY says

    May 29, 2016 at 11:43 am

    Sir, if I connect 15 watt cfl bulb to 150 watt inverter with 200 watt battery.Then, how much hours it will keep bright.

    Reply
    • Swagatam says

      May 29, 2016 at 12:22 pm

      Sudip, please calculate it here:

      https://www.homemade-circuits.com/p/battery-calculator.html

      Reply
  23. andrei ruiz says

    March 21, 2016 at 7:31 am

    sir how to get 24v in the circuit? and what is the frequency???

    Reply
    • Swagatam says

      March 22, 2016 at 2:32 am

      andrie, you will need to reduce the inductance of the inductor by some trial and error to get 24V at the output….for 24V you can remove the BJT and the zener diode stages which are shown at the output section of the circuit.

      Reply
      • charm says

        December 31, 2024 at 8:34 am

        hi Swag will it be the same (no BJT+zenor) for 48v?

        Reply
        • Swagatam says

          December 31, 2024 at 9:02 am

          Hi Charm,
          If the input is higher than 48V then the zener feedback stage will be required.

          Reply
  24. Unknown says

    November 3, 2015 at 4:12 pm

    hello sir, please i want to make a transformerless inverter (no ferrite core transformer) with 12vdc input and 220vac as output, the wattage should be between 200watts and 500watts. is it possible?

    Reply
    • Swagatam says

      November 4, 2015 at 4:17 am

      sorry that's impossible….

      Reply
    • gulsattar world says

      February 5, 2016 at 9:40 am

      Sir which ic I used for Dc 12v to 220v Ac up to 20amp current

      Reply
      • Swagatam says

        February 5, 2016 at 2:26 pm

        I didn't understand what you are saying?

        Reply
  25. Swagatam says

    August 19, 2015 at 4:10 am

    yes it should be also rated at above 300V…you can replace it with a IRF840

    Reply
  26. Raman says

    August 18, 2015 at 3:52 pm

    In the schematic, the output 220 volts is connected across the drain – source terminals of the 30 v mosfet ??

    Reply
  27. jairam says

    February 2, 2015 at 7:38 am

    hello sir
    can i use this circuit for charging of a dc input fan?

    wat is the case when the input given 12v battery is discharged?

    can i giv a input to this circuit by 12v rechargeble battery?

    which mosfet i hav to use to this circuit (say the mosfet number)?

    Reply
  28. Dipto says

    January 19, 2015 at 10:07 am

    Sir you have mentioned that we can use TIP122 instead of NTD4302, then what should be the pin configuration of TIP122? I mean how should I connect the transistor into the circuit?

    Reply
    • Swagatam says

      January 20, 2015 at 3:04 am

      Dipto, yes it's possible, join its base to pin3 of the IC via a 10K resistor, emitter to ground and collector to coil

      Reply
    • Dipto says

      January 20, 2015 at 11:41 am

      Thank you sir for your reply I will be using TIP122 instead of NTD4302 since I couldn't find them in the shop.

      Reply
  29. JOSEMON SHAJI says

    December 20, 2014 at 10:27 am

    can i use IRFZ44N mosfet

    Reply
  30. Krishnanand Intitute says

    December 17, 2014 at 2:07 am

    Sir
    I want to make a power inverter for 48v dc to 220v ac. Plz guide me…

    Reply
    • Swagatam says

      December 17, 2014 at 5:43 am

      Krishna, you can try the following:

      https://www.homemade-circuits.com/2014/11/48-v-inverter-circuit.html

      Reply
  31. Roney Renaissance says

    October 29, 2014 at 9:47 pm

    Hi Swagatam !
    May I ask if this circuit can be used to power a laptop charger ?
    Thanks

    Reply
    • Swagatam says

      October 30, 2014 at 4:08 am

      Hi Roney, yes you can used it for charging a laptop from your car battery, the inductor will need to be dimensioned and tweaked appropriately until the required 19v is achieved…

      Reply
  32. Abu-Hafss says

    October 21, 2014 at 8:30 pm

    You can get high voltage at high frequency (not 50Hz) but the current would be around 100mA. How much is your load?

    Reply
  33. ainsworth lynch says

    October 21, 2014 at 6:53 pm

    ok I tried building this circuit on electronic work bench but only got 8v out,

    Reply
    • Swagatam says

      October 22, 2014 at 5:46 am

      keep the BC547 disconnected initially and then check…

      Reply
  34. ainsworth lynch says

    October 20, 2014 at 2:52 pm

    Which coil would i use to get 110v at 50hz

    Reply
    • Swagatam says

      October 21, 2014 at 5:49 am

      you'll have to find it by experimenting with different number of turns.

      Reply
  35. Kiran King says

    September 4, 2014 at 1:55 pm

    hi iam doing a project in which i need to convert 6v DC to 230v AC . after converting can i use any electrical appliances from the output of 230v AC

    Reply
    • Swagatam says

      September 5, 2014 at 6:14 am

      search for any IC 4047 inverter circuit and you can use it for your application

      Reply
  36. franco rossi says

    May 3, 2014 at 1:44 pm

    hi swagatam majumdar,
    is possible with this circuit to fed an solenoid water valve (7w) as valve of washing machine or an little motor (4w) as flat of wave oven?
    maybe is better to think an inverter circuit more complex as that you have posted in other pages?
    thank you so much
    regards
    andrea

    Reply
    • Swagatam says

      May 4, 2014 at 4:31 am

      Hi Andrea, for a DC application, the above circuit could be used, but for AC devices an inverter would be more preferable.

      Reply
  37. nitin gondliya says

    January 23, 2014 at 9:07 am

    220v ac 2amp load

    Reply
    • Swagatam says

      January 24, 2014 at 6:39 am

      you will need a 400 watt inveter for that, the above circuit will not work

      Reply
  38. nitin gondliya says

    January 22, 2014 at 7:12 am

    plz reply i m waiting

    Reply
    • Swagatam says

      January 23, 2014 at 4:30 am

      hello nitin,
      please tell me all the technical details of your project, only then i would be able to suggest regarding the above circuit integration.

      Reply
  39. nitin gondliya says

    January 22, 2014 at 6:47 am

    hello sir nice work…i m planing electrick go kart powerd by sewing machine motor can i use this circuit??
    i have 30ah battery ..sorry for bad english…reply fast..thank u sir….u r genius,

    Reply
  40. Abu-Hafss says

    December 25, 2013 at 7:51 pm

    Hi Swagatam

    I am working to use this circuit (excluding the transistor network) as a simple laptop charger from car battery.

    1) One option needs a mosfet with following properties:

    25V, 5A and RDS(on) 3.5 Ohms

    I am not sure if such mosfet is available because such RDS(on) value is for small current mosfets.

    2) The second option is to reduce the input voltage to 6V but, that needs high current regulator.

    Which of these two options is more practical?

    Reply
    • Swagatam says

      December 26, 2013 at 6:56 am

      Hi Abu-Hafss,

      The first option looks fine, you can use a higher rated mosfet such as IRF540 etc. it would also work as good and fulfill the results.

      Reply
    • Abu-Hafss says

      December 26, 2013 at 4:54 pm

      But that is 44mOhms whereas I need 3.5Ohms!

      Reply
    • Swagatam says

      December 27, 2013 at 5:57 am

      it's 44 milliohms which is a lot better than 3.5ohms, meaning the ON resistance of the drain to source will be just 44 milliohms.

      Reply
  41. Abu-Hafss says

    November 6, 2013 at 8:33 pm

    Hi Swagatam

    Can this circuit be used to power a 30-40W soldering iron?
    If yes, would 12V-5A input be enough?

    Reply
    • Swagatam says

      November 8, 2013 at 4:09 am

      Hi Abu-Hafss,

      yes it can be used, 12v/5amp would be just enough for that.

      Reply
  42. Abu-Hafss says

    October 25, 2013 at 8:49 pm

    Hi Swagatam

    I am considering to use this transformerless circuit to provide high voltage in CDI. Any comments/modifications?

    Reply
    • Swagatam says

      October 26, 2013 at 1:50 pm

      Hi Abu-Hafss,

      Yes, it's worth trying.

      Reply
    • Abu-Hafss says

      October 26, 2013 at 9:23 pm

      Hi Swagatam

      As per my usual practice, I have simulated this circuit and got following findings;

      The frequency is 510Hz. If it is decreased to 50-100Hz, the output becomes more than 1kV.

      The inductor is 250µH. The capacitor is 10µF.

      Following is the wave pattern:

      " rel="nofollow ugc">comment image

      There is one issue i.e. how do we convert it to 230VDC? The CDI capacitor needs HV DC for charging which is provided thru a diode (half wave rectification) but, this output cannot be rectified, neither thru half wave rectification nor full wave.

      If the capacitor value is increased, the output decreases.

      Reply
    • Swagatam says

      October 27, 2013 at 5:15 am

      Hi Abu-Hafss,

      You can experiment with the number of turns of the inductor for getting different voltage levels at the output, because that's the only component that is directly related with voltage boosting.

      Reply
    • Abu-Hafss says

      October 27, 2013 at 10:22 am

      Hi Swagatam

      The out put is sort triangular waves of AC 230V (fluctuating between 0-230V not between 230 and -230 at 510Hz. How do we convert it to DC??? Single rectifier or bridge rectifier is not working, the output remains the same.

      Maybe, the simulator is experiencing some difficulties in performing the rectification. Based on your experience, if you simulate in your mind, do you think the rectifier/capacitor should work to give a smooth DC output?

      Reply
    • Swagatam says

      October 27, 2013 at 12:24 pm

      Hi Abu-Hafss,

      Just connect a couple of 10uF250V(in parallel) across the output, no diodes are needed.

      Reply
  43. devendra kumar says

    October 25, 2013 at 3:55 pm

    sir can i use the polyester fluorescent ballast for inductor…

    Reply
    • Swagatam says

      October 26, 2013 at 1:47 pm

      It will depend on the output voltage requirement, if the inductor is able to produce it then it would be fine.

      Reply
  44. Rashid Ansari says

    September 27, 2013 at 10:10 am

    Thank you sir for your reply, I'll try it.
    Rashid

    Reply
  45. Rashid Ansari says

    September 25, 2013 at 5:43 pm

    Hello Sir,

    How can i modify this circuit to run a 150 or 100W fan.

    Thank you in advance.

    Rashid

    Reply
    • Swagatam says

      September 26, 2013 at 3:07 pm

      Hello Rashid,

      you will have to modify the coil by experimenting a little with the no of turns and wire gauge until it satisfies the conditions.

      Reply
  46. usmanium says

    September 10, 2013 at 2:40 pm

    Obaid just take out 220V AC, add a step down transformer that makes it 24V and then add a bridge rectifier and two filter capacitors electrolytic 10uF 25V and a 7812 IC, u'll get 12V

    Reply
  47. Unknown says

    August 27, 2013 at 2:20 pm

    okay sure i will try that and see what is the result, Thanks again sir.

    Reply
  48. Unknown says

    August 27, 2013 at 9:09 am

    Thank you sir, I had tried joule before but the problem is the current supply is not high enough.I need at least 100mA. Can I know how to increase the current or is there any way to do it?

    Reply
    • Swagatam says

      August 27, 2013 at 2:14 pm

      Use parallel wire winding, meaning use two or three wires together and then wind them as per the data, this will increase the current of the transformer,also you will have to use more number of cells in parallel for supplying the required amount of current.

      Reply
  49. Unknown says

    August 25, 2013 at 6:32 am

    Hi Sir, sorry to ask this question here as I could not find a dc to dc step up circuit in your forum. I am thinking is it possible to modify this circuit to step up 2vdc to 12vdc? Thank you.

    Reply
    • Swagatam says

      August 26, 2013 at 4:52 am

      Hi Unknown,

      the above circuit will require a minimum of 4V to operate correctly, I think you should try the following circuit, might just work:

      https://www.homemade-circuits.com/2012/10/1-watt-led-driver-using-joule-thief.html

      Reply
    • Jayanta Roy says

      September 22, 2013 at 7:41 pm

      Dear sir ,
      I have a battery 12v 32ah sf sonic jet , how can i charge by home made circuit ,I would like to use it as 200 Watt CFL inverter, kindly help me to making a 3 amp constant current battery charger,
      thanking you,
      Jayanta Roy

      Reply
      • Daoud says

        November 9, 2021 at 9:43 am

        Bonjour Monsieur.
        Pour le transistor mosfet il faut celui qui peut supporter une tension de 220V ?

        Reply
    • Swagatam says

      September 23, 2013 at 3:55 am

      Dear Jayanta,

      You can try the second circuit shown in this link, but I am not sure about the transformer details you may have experiment with its size and wire gauge:

      https://www.homemade-circuits.com/high-current-10-to-20-amp-automatic/

      Reply
  50. Swagatam says

    August 5, 2013 at 4:28 am

    you can use the square wave symbol range for checking the frequency operation of the circuit…..

    if it's not working with a mosfet you can try a transistor instead, try a TIP122.

    Reply
  51. Swagatam says

    August 3, 2013 at 1:37 pm

    Your DMM should have a frequency measuring option, normally indicated with "kHz" symbol, otherwise it won't help.

    In response to the 555 frequency triggering, when the mosfet is in the ON state, the inductor stores the specified amount of electrical energy in it and during the mosfet OFF state reverts it to the output. This back emf from the coil constitutes the 220V at the ouput…

    Reply
  52. Swagatam says

    August 3, 2013 at 7:51 am

    It would be dangerous to use the above type of configuration for your requirement, you may try the following design:

    https://www.homemade-circuits.com/2013/06/0-300v-variable-voltage-current.html

    Reply
  53. Swagatam says

    August 3, 2013 at 7:47 am

    Please refer to this post, it has all the details:

    https://www.homemade-circuits.com/2013/05/55v-110a-n-channel-mosfet-irf3205.html

    Reply
  54. Swagatam says

    August 2, 2013 at 3:57 pm

    Yes you can use a DMM which has a frequency feature in it.

    Reply
  55. Obaid Rehman says

    August 2, 2013 at 3:45 pm

    hello again,
    i need to make a just opposite project converting 220v AC to 12v/24v DC help me please or please give me link of the same 🙂

    Reply
  56. Swagatam says

    August 2, 2013 at 3:28 am

    It will be difficult for me to identify exactly how you fixed the mosfet, I hope you've put it correctly.

    What kind of inductor did you use and is your IC generating the required high frequency?? these two factors determine the correct operating conditions for the circuit.

    Reply
    • Jansen says

      January 24, 2022 at 8:09 am

      Qual seria a função do DIODO ZENER , no circuito ?

      Reply
      • Swagatam says

        January 24, 2022 at 10:19 am

        If the output voltage exceeds the zener value, the zener conducts and switches ON the BC547, which in turn switches OFF the mosfet ensuring that the output never exceeds the value of the zener voltage

        Reply
        • Endel neiva says

          January 26, 2022 at 2:20 pm

          I would like Mr. Swagatam engineer
          to teach me how to put a feedback circuit
          with photo coupler in an inverter output equal to 127vac
          the feedback circuit will monitor this voltage of 127vac
          and make sure that it never drops or changes in any way always form
          127vac and never change. Mr. could be showing here
          through an article

          – CI USED = SG3525
          – PHOTO USED = PC817

          Reply
          • Swagatam says

            January 27, 2022 at 9:11 am

            Endel, you can refer to the following post!

            The first 3 circuits, all have a feedback control, but without an opto coupler. Opto coupler can be difficult to set, so no opto couplers are used.

            https://www.homemade-circuits.com/sg3525-pure-sinewave-inverter-circuit/

            Reply

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